//
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// YYTextKeyboardManager.m
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// YYText <https://github.com/ibireme/YYText>
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//
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// Created by ibireme on 15/6/3.
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// Copyright (c) 2015 ibireme.
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//
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// This source code is licensed under the MIT-style license found in the
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// LICENSE file in the root directory of this source tree.
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//
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#import "YYTextKeyboardManager.h"
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#import "YYTextUtilities.h"
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#import <objc/runtime.h>
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static int _YYTextKeyboardViewFrameObserverKey;
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/// Observer for view's frame/bounds/center/transform
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@interface _YYTextKeyboardViewFrameObserver : NSObject
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@property (nonatomic, copy) void (^notifyBlock)(UIView *keyboard);
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- (void)addToKeyboardView:(UIView *)keyboardView;
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+ (instancetype)observerForView:(UIView *)keyboardView;
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@end
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@implementation _YYTextKeyboardViewFrameObserver {
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__unsafe_unretained UIView *_keyboardView;
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}
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- (void)addToKeyboardView:(UIView *)keyboardView {
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if (_keyboardView == keyboardView) return;
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if (_keyboardView) {
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[self removeFrameObserver];
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objc_setAssociatedObject(_keyboardView, &_YYTextKeyboardViewFrameObserverKey, nil, OBJC_ASSOCIATION_RETAIN_NONATOMIC);
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}
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_keyboardView = keyboardView;
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if (keyboardView) {
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[self addFrameObserver];
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}
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objc_setAssociatedObject(keyboardView, &_YYTextKeyboardViewFrameObserverKey, self, OBJC_ASSOCIATION_RETAIN_NONATOMIC);
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}
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- (void)removeFrameObserver {
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[_keyboardView removeObserver:self forKeyPath:@"frame"];
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[_keyboardView removeObserver:self forKeyPath:@"center"];
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[_keyboardView removeObserver:self forKeyPath:@"bounds"];
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[_keyboardView removeObserver:self forKeyPath:@"transform"];
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_keyboardView = nil;
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}
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- (void)addFrameObserver {
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if (!_keyboardView) return;
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[_keyboardView addObserver:self forKeyPath:@"frame" options:kNilOptions context:NULL];
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[_keyboardView addObserver:self forKeyPath:@"center" options:kNilOptions context:NULL];
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[_keyboardView addObserver:self forKeyPath:@"bounds" options:kNilOptions context:NULL];
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[_keyboardView addObserver:self forKeyPath:@"transform" options:kNilOptions context:NULL];
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}
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- (void)dealloc {
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[self removeFrameObserver];
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}
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+ (instancetype)observerForView:(UIView *)keyboardView {
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if (!keyboardView) return nil;
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return objc_getAssociatedObject(keyboardView, &_YYTextKeyboardViewFrameObserverKey);
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}
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- (void)observeValueForKeyPath:(NSString *)keyPath ofObject:(id)object change:(NSDictionary *)change context:(void *)context {
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BOOL isPrior = [[change objectForKey:NSKeyValueChangeNotificationIsPriorKey] boolValue];
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if (isPrior) return;
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NSKeyValueChange changeKind = [[change objectForKey:NSKeyValueChangeKindKey] integerValue];
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if (changeKind != NSKeyValueChangeSetting) return;
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id newVal = [change objectForKey:NSKeyValueChangeNewKey];
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if (newVal == [NSNull null]) newVal = nil;
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if (_notifyBlock) {
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_notifyBlock(_keyboardView);
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}
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}
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@end
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@implementation YYTextKeyboardManager {
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NSHashTable *_observers;
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CGRect _fromFrame;
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BOOL _fromVisible;
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UIInterfaceOrientation _fromOrientation;
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CGRect _notificationFromFrame;
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CGRect _notificationToFrame;
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NSTimeInterval _notificationDuration;
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UIViewAnimationCurve _notificationCurve;
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BOOL _hasNotification;
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CGRect _observedToFrame;
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BOOL _hasObservedChange;
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BOOL _lastIsNotification;
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}
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- (instancetype)init {
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@throw [NSException exceptionWithName:@"YYTextKeyboardManager init error" reason:@"Use 'defaultManager' to get instance." userInfo:nil];
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return [super init];
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}
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- (instancetype)_init {
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self = [super init];
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_observers = [[NSHashTable alloc] initWithOptions:NSPointerFunctionsWeakMemory|NSPointerFunctionsObjectPointerPersonality capacity:0];
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[[NSNotificationCenter defaultCenter] addObserver:self
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selector:@selector(_keyboardFrameWillChangeNotification:)
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name:UIKeyboardWillChangeFrameNotification
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object:nil];
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// for iPad (iOS 9)
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if ([UIDevice currentDevice].systemVersion.floatValue >= 9) {
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[[NSNotificationCenter defaultCenter] addObserver:self
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selector:@selector(_keyboardFrameDidChangeNotification:)
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name:UIKeyboardDidChangeFrameNotification
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object:nil];
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}
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return self;
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}
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- (void)_initFrameObserver {
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UIView *keyboardView = self.keyboardView;
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if (!keyboardView) return;
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__weak typeof(self) _self = self;
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_YYTextKeyboardViewFrameObserver *observer = [_YYTextKeyboardViewFrameObserver observerForView:keyboardView];
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if (!observer) {
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observer = [_YYTextKeyboardViewFrameObserver new];
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observer.notifyBlock = ^(UIView *keyboard) {
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[_self _keyboardFrameChanged:keyboard];
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};
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[observer addToKeyboardView:keyboardView];
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}
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}
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- (void)dealloc {
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[[NSNotificationCenter defaultCenter] removeObserver:self];
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}
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+ (instancetype)defaultManager {
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static YYTextKeyboardManager *mgr = nil;
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static dispatch_once_t onceToken;
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dispatch_once(&onceToken, ^{
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if (!YYTextIsAppExtension()) {
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mgr = [[self alloc] _init];
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}
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});
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return mgr;
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}
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+ (void)load {
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dispatch_after(dispatch_time(DISPATCH_TIME_NOW, (int64_t)(0.1 * NSEC_PER_SEC)), dispatch_get_main_queue(), ^{
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[self defaultManager];
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});
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}
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- (void)addObserver:(id<YYTextKeyboardObserver>)observer {
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if (!observer) return;
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[_observers addObject:observer];
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}
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- (void)removeObserver:(id<YYTextKeyboardObserver>)observer {
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if (!observer) return;
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[_observers removeObject:observer];
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}
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- (UIWindow *)keyboardWindow {
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UIApplication *app = YYTextSharedApplication();
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if (!app) return nil;
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UIWindow *window = nil;
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for (window in app.windows) {
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if ([self _getKeyboardViewFromWindow:window]) return window;
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}
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window = app.keyWindow;
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if ([self _getKeyboardViewFromWindow:window]) return window;
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NSMutableArray *kbWindows = nil;
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for (window in app.windows) {
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NSString *windowName = NSStringFromClass(window.class);
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if ([self _systemVersion] < 9) {
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// UITextEffectsWindow
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if (windowName.length == 19 &&
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[windowName hasPrefix:@"UI"] &&
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[windowName hasSuffix:@"TextEffectsWindow"]) {
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if (!kbWindows) kbWindows = [NSMutableArray new];
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[kbWindows addObject:window];
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}
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} else {
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// UIRemoteKeyboardWindow
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if (windowName.length == 22 &&
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[windowName hasPrefix:@"UI"] &&
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[windowName hasSuffix:@"RemoteKeyboardWindow"]) {
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if (!kbWindows) kbWindows = [NSMutableArray new];
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[kbWindows addObject:window];
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}
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}
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}
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if (kbWindows.count == 1) {
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return kbWindows.firstObject;
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}
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return nil;
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}
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- (UIView *)keyboardView {
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UIApplication *app = YYTextSharedApplication();
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if (!app) return nil;
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UIWindow *window = nil;
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UIView *view = nil;
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for (window in app.windows) {
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view = [self _getKeyboardViewFromWindow:window];
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if (view) return view;
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}
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window = app.keyWindow;
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view = [self _getKeyboardViewFromWindow:window];
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if (view) return view;
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return nil;
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}
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- (BOOL)isKeyboardVisible {
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UIWindow *window = self.keyboardWindow;
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if (!window) return NO;
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UIView *view = self.keyboardView;
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if (!view) return NO;
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CGRect rect = CGRectIntersection(window.bounds, view.frame);
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if (CGRectIsNull(rect)) return NO;
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if (CGRectIsInfinite(rect)) return NO;
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return rect.size.width > 0 && rect.size.height > 0;
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}
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- (CGRect)keyboardFrame {
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UIView *keyboard = [self keyboardView];
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if (!keyboard) return CGRectNull;
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CGRect frame = CGRectNull;
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UIWindow *window = keyboard.window;
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if (window) {
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frame = [window convertRect:keyboard.frame toWindow:nil];
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} else {
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frame = keyboard.frame;
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}
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return frame;
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}
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#pragma mark - private
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- (double)_systemVersion {
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static double v;
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static dispatch_once_t onceToken;
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dispatch_once(&onceToken, ^{
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v = [UIDevice currentDevice].systemVersion.doubleValue;
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});
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return v;
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}
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- (UIView *)_getKeyboardViewFromWindow:(UIWindow *)window {
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/*
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iOS 6/7:
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UITextEffectsWindow
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UIPeripheralHostView << keyboard
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iOS 8:
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UITextEffectsWindow
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UIInputSetContainerView
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UIInputSetHostView << keyboard
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iOS 9:
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UIRemoteKeyboardWindow
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UIInputSetContainerView
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UIInputSetHostView << keyboard
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*/
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if (!window) return nil;
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// Get the window
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NSString *windowName = NSStringFromClass(window.class);
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if ([self _systemVersion] < 9) {
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// UITextEffectsWindow
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if (windowName.length != 19) return nil;
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if (![windowName hasPrefix:@"UI"]) return nil;
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if (![windowName hasSuffix:@"TextEffectsWindow"]) return nil;
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} else {
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// UIRemoteKeyboardWindow
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if (windowName.length != 22) return nil;
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if (![windowName hasPrefix:@"UI"]) return nil;
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if (![windowName hasSuffix:@"RemoteKeyboardWindow"]) return nil;
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}
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// Get the view
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if ([self _systemVersion] < 8) {
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// UIPeripheralHostView
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for (UIView *view in window.subviews) {
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NSString *viewName = NSStringFromClass(view.class);
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if (viewName.length != 20) continue;
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if (![viewName hasPrefix:@"UI"]) continue;
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if (![viewName hasSuffix:@"PeripheralHostView"]) continue;
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return view;
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}
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} else {
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// UIInputSetContainerView
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for (UIView *view in window.subviews) {
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NSString *viewName = NSStringFromClass(view.class);
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if (viewName.length != 23) continue;
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if (![viewName hasPrefix:@"UI"]) continue;
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if (![viewName hasSuffix:@"InputSetContainerView"]) continue;
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// UIInputSetHostView
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for (UIView *subView in view.subviews) {
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NSString *subViewName = NSStringFromClass(subView.class);
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if (subViewName.length != 18) continue;
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if (![subViewName hasPrefix:@"UI"]) continue;
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if (![subViewName hasSuffix:@"InputSetHostView"]) continue;
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return subView;
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}
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}
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}
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return nil;
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}
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- (void)_keyboardFrameWillChangeNotification:(NSNotification *)notif {
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if (![notif.name isEqualToString:UIKeyboardWillChangeFrameNotification]) return;
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NSDictionary *info = notif.userInfo;
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if (!info) return;
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[self _initFrameObserver];
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NSValue *beforeValue = info[UIKeyboardFrameBeginUserInfoKey];
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NSValue *afterValue = info[UIKeyboardFrameEndUserInfoKey];
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NSNumber *curveNumber = info[UIKeyboardAnimationCurveUserInfoKey];
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NSNumber *durationNumber = info[UIKeyboardAnimationDurationUserInfoKey];
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CGRect before = beforeValue.CGRectValue;
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CGRect after = afterValue.CGRectValue;
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UIViewAnimationCurve curve = curveNumber.integerValue;
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NSTimeInterval duration = durationNumber.doubleValue;
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// ignore zero end frame
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if (after.size.width <= 0 && after.size.height <= 0) return;
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_notificationFromFrame = before;
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_notificationToFrame = after;
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_notificationCurve = curve;
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_notificationDuration = duration;
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_hasNotification = YES;
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_lastIsNotification = YES;
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[NSObject cancelPreviousPerformRequestsWithTarget:self selector:@selector(_notifyAllObservers) object:nil];
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if (duration == 0) {
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[self performSelector:@selector(_notifyAllObservers) withObject:nil afterDelay:0 inModes:@[NSRunLoopCommonModes]];
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} else {
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[self _notifyAllObservers];
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}
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}
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- (void)_keyboardFrameDidChangeNotification:(NSNotification *)notif {
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if (![notif.name isEqualToString:UIKeyboardDidChangeFrameNotification]) return;
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NSDictionary *info = notif.userInfo;
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if (!info) return;
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[self _initFrameObserver];
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NSValue *afterValue = info[UIKeyboardFrameEndUserInfoKey];
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CGRect after = afterValue.CGRectValue;
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// ignore zero end frame
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if (after.size.width <= 0 && after.size.height <= 0) return;
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_notificationToFrame = after;
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_notificationCurve = UIViewAnimationCurveEaseInOut;
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_notificationDuration = 0;
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_hasNotification = YES;
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_lastIsNotification = YES;
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[NSObject cancelPreviousPerformRequestsWithTarget:self selector:@selector(_notifyAllObservers) object:nil];
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[self performSelector:@selector(_notifyAllObservers) withObject:nil afterDelay:0 inModes:@[NSRunLoopCommonModes]];
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}
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- (void)_keyboardFrameChanged:(UIView *)keyboard {
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if (keyboard != self.keyboardView) return;
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UIWindow *window = keyboard.window;
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if (window) {
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_observedToFrame = [window convertRect:keyboard.frame toWindow:nil];
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} else {
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_observedToFrame = keyboard.frame;
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}
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_hasObservedChange = YES;
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_lastIsNotification = NO;
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[NSObject cancelPreviousPerformRequestsWithTarget:self selector:@selector(_notifyAllObservers) object:nil];
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[self performSelector:@selector(_notifyAllObservers) withObject:nil afterDelay:0 inModes:@[NSRunLoopCommonModes]];
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}
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- (void)_notifyAllObservers {
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UIApplication *app = YYTextSharedApplication();
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if (!app) return;
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UIView *keyboard = self.keyboardView;
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UIWindow *window = keyboard.window;
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if (!window) {
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window = app.keyWindow;
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}
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if (!window) {
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window = app.windows.firstObject;
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}
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YYTextKeyboardTransition trans = {0};
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// from
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if (_fromFrame.size.width == 0 && _fromFrame.size.height == 0) { // first notify
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_fromFrame.size.width = window.bounds.size.width;
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_fromFrame.size.height = trans.toFrame.size.height;
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_fromFrame.origin.x = trans.toFrame.origin.x;
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_fromFrame.origin.y = window.bounds.size.height;
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}
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trans.fromFrame = _fromFrame;
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trans.fromVisible = _fromVisible;
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// to
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if (_lastIsNotification || (_hasObservedChange && CGRectEqualToRect(_observedToFrame, _notificationToFrame))) {
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trans.toFrame = _notificationToFrame;
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trans.animationDuration = _notificationDuration;
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trans.animationCurve = _notificationCurve;
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trans.animationOption = _notificationCurve << 16;
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// Fix iPad(iOS7) keyboard frame error after rorate device when the keyboard is not docked to bottom.
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if (((int)[self _systemVersion]) == 7) {
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UIInterfaceOrientation ori = app.statusBarOrientation;
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if (_fromOrientation != UIInterfaceOrientationUnknown && _fromOrientation != ori) {
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switch (ori) {
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case UIInterfaceOrientationPortrait: {
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if (CGRectGetMaxY(trans.toFrame) != window.frame.size.height) {
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trans.toFrame.origin.y -= trans.toFrame.size.height;
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}
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} break;
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case UIInterfaceOrientationPortraitUpsideDown: {
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if (CGRectGetMinY(trans.toFrame) != 0) {
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trans.toFrame.origin.y += trans.toFrame.size.height;
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}
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} break;
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case UIInterfaceOrientationLandscapeLeft: {
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if (CGRectGetMaxX(trans.toFrame) != window.frame.size.width) {
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trans.toFrame.origin.x -= trans.toFrame.size.width;
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}
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} break;
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case UIInterfaceOrientationLandscapeRight: {
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if (CGRectGetMinX(trans.toFrame) != 0) {
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trans.toFrame.origin.x += trans.toFrame.size.width;
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}
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} break;
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default: break;
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}
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}
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}
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} else {
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trans.toFrame = _observedToFrame;
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}
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if (window && trans.toFrame.size.width > 0 && trans.toFrame.size.height > 0) {
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CGRect rect = CGRectIntersection(window.bounds, trans.toFrame);
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if (!CGRectIsNull(rect) && !CGRectIsEmpty(rect)) {
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trans.toVisible = YES;
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}
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}
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if (!CGRectEqualToRect(trans.toFrame, _fromFrame)) {
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for (id<YYTextKeyboardObserver> observer in _observers.copy) {
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if ([observer respondsToSelector:@selector(keyboardChangedWithTransition:)]) {
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[observer keyboardChangedWithTransition:trans];
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}
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}
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}
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_hasNotification = NO;
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_hasObservedChange = NO;
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_fromFrame = trans.toFrame;
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_fromVisible = trans.toVisible;
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_fromOrientation = app.statusBarOrientation;
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}
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- (CGRect)convertRect:(CGRect)rect toView:(UIView *)view {
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UIApplication *app = YYTextSharedApplication();
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if (!app) return CGRectZero;
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if (CGRectIsNull(rect)) return rect;
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if (CGRectIsInfinite(rect)) return rect;
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UIWindow *mainWindow = app.keyWindow;
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if (!mainWindow) mainWindow = app.windows.firstObject;
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if (!mainWindow) { // no window ?!
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if (view) {
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[view convertRect:rect fromView:nil];
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} else {
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return rect;
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}
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}
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rect = [mainWindow convertRect:rect fromWindow:nil];
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if (!view) return [mainWindow convertRect:rect toWindow:nil];
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if (view == mainWindow) return rect;
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UIWindow *toWindow = [view isKindOfClass:[UIWindow class]] ? (id)view : view.window;
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if (!mainWindow || !toWindow) return [mainWindow convertRect:rect toView:view];
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if (mainWindow == toWindow) return [mainWindow convertRect:rect toView:view];
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// in different window
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rect = [mainWindow convertRect:rect toView:mainWindow];
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rect = [toWindow convertRect:rect fromWindow:mainWindow];
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rect = [view convertRect:rect fromView:toWindow];
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return rect;
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}
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@end
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