// The MIT License (MIT)
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//
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// Copyright (c) 2015-2016 forkingdog ( https://github.com/forkingdog )
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//
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// Permission is hereby granted, free of charge, to any person obtaining a copy
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// of this software and associated documentation files (the "Software"), to deal
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// in the Software without restriction, including without limitation the rights
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// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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// copies of the Software, and to permit persons to whom the Software is
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// furnished to do so, subject to the following conditions:
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//
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// The above copyright notice and this permission notice shall be included in all
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// copies or substantial portions of the Software.
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//
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// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
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// SOFTWARE.
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#import "UINavigationController+FDFullscreenPopGesture.h"
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#import <objc/runtime.h>
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@interface _FDFullscreenPopGestureRecognizerDelegate : NSObject <UIGestureRecognizerDelegate>
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@property (nonatomic, weak) UINavigationController *navigationController;
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@end
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@implementation _FDFullscreenPopGestureRecognizerDelegate
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- (BOOL)gestureRecognizerShouldBegin:(UIPanGestureRecognizer *)gestureRecognizer
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{
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// Ignore when no view controller is pushed into the navigation stack.
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if (self.navigationController.viewControllers.count <= 1) {
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return NO;
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}
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// Disable when the active view controller doesn't allow interactive pop.
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UIViewController *topViewController = self.navigationController.viewControllers.lastObject;
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if (topViewController.fd_interactivePopDisabled) {
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return NO;
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}
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// Ignore pan gesture when the navigation controller is currently in transition.
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if ([[self.navigationController valueForKey:@"_isTransitioning"] boolValue]) {
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return NO;
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}
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// Prevent calling the handler when the gesture begins in an opposite direction.
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CGPoint translation = [gestureRecognizer translationInView:gestureRecognizer.view];
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if (translation.x <= 0) {
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return NO;
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}
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return YES;
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}
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@end
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typedef void (^_FDViewControllerWillAppearInjectBlock)(UIViewController *viewController, BOOL animated);
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@interface UIViewController (FDFullscreenPopGesturePrivate)
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@property (nonatomic, copy) _FDViewControllerWillAppearInjectBlock fd_willAppearInjectBlock;
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@end
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@implementation UIViewController (FDFullscreenPopGesturePrivate)
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+ (void)load
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{
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Method originalMethod = class_getInstanceMethod(self, @selector(viewWillAppear:));
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Method swizzledMethod = class_getInstanceMethod(self, @selector(fd_viewWillAppear:));
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method_exchangeImplementations(originalMethod, swizzledMethod);
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}
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- (void)fd_viewWillAppear:(BOOL)animated
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{
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// Forward to primary implementation.
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[self fd_viewWillAppear:animated];
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if (self.fd_willAppearInjectBlock) {
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self.fd_willAppearInjectBlock(self, animated);
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}
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}
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- (_FDViewControllerWillAppearInjectBlock)fd_willAppearInjectBlock
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{
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return objc_getAssociatedObject(self, _cmd);
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}
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- (void)setFd_willAppearInjectBlock:(_FDViewControllerWillAppearInjectBlock)block
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{
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objc_setAssociatedObject(self, @selector(fd_willAppearInjectBlock), block, OBJC_ASSOCIATION_COPY_NONATOMIC);
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}
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@end
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@implementation UINavigationController (FDFullscreenPopGesture)
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+ (void)load
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{
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// Inject "-pushViewController:animated:"
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Method originalMethod = class_getInstanceMethod(self, @selector(pushViewController:animated:));
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Method swizzledMethod = class_getInstanceMethod(self, @selector(fd_pushViewController:animated:));
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method_exchangeImplementations(originalMethod, swizzledMethod);
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}
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- (void)fd_pushViewController:(UIViewController *)viewController animated:(BOOL)animated
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{
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if (![self.interactivePopGestureRecognizer.view.gestureRecognizers containsObject:self.fd_fullscreenPopGestureRecognizer]) {
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// Add our own gesture recognizer to where the onboard screen edge pan gesture recognizer is attached to.
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[self.interactivePopGestureRecognizer.view addGestureRecognizer:self.fd_fullscreenPopGestureRecognizer];
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// Forward the gesture events to the private handler of the onboard gesture recognizer.
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NSArray *internalTargets = [self.interactivePopGestureRecognizer valueForKey:@"targets"];
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id internalTarget = [internalTargets.firstObject valueForKey:@"target"];
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SEL internalAction = NSSelectorFromString(@"handleNavigationTransition:");
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self.fd_fullscreenPopGestureRecognizer.delegate = self.fd_popGestureRecognizerDelegate;
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[self.fd_fullscreenPopGestureRecognizer addTarget:internalTarget action:internalAction];
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// Disable the onboard gesture recognizer.
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self.interactivePopGestureRecognizer.enabled = NO;
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}
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// Handle perferred navigation bar appearance.
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[self fd_setupViewControllerBasedNavigationBarAppearanceIfNeeded:viewController];
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// Forward to primary implementation.
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[self fd_pushViewController:viewController animated:animated];
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}
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- (void)fd_setupViewControllerBasedNavigationBarAppearanceIfNeeded:(UIViewController *)appearingViewController
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{
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if (!self.fd_viewControllerBasedNavigationBarAppearanceEnabled) {
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return;
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}
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__weak typeof(self) weakSelf = self;
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_FDViewControllerWillAppearInjectBlock block = ^(UIViewController *viewController, BOOL animated) {
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__strong typeof(weakSelf) strongSelf = weakSelf;
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if (strongSelf) {
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[strongSelf setNavigationBarHidden:viewController.fd_prefersNavigationBarHidden animated:animated];
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}
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};
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// Setup will appear inject block to appearing view controller.
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// Setup disappearing view controller as well, because not every view controller is added into
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// stack by pushing, maybe by "-setViewControllers:".
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appearingViewController.fd_willAppearInjectBlock = block;
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UIViewController *disappearingViewController = self.viewControllers.lastObject;
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if (disappearingViewController && !disappearingViewController.fd_willAppearInjectBlock) {
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disappearingViewController.fd_willAppearInjectBlock = block;
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}
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}
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- (_FDFullscreenPopGestureRecognizerDelegate *)fd_popGestureRecognizerDelegate
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{
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_FDFullscreenPopGestureRecognizerDelegate *delegate = objc_getAssociatedObject(self, _cmd);
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if (!delegate) {
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delegate = [[_FDFullscreenPopGestureRecognizerDelegate alloc] init];
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delegate.navigationController = self;
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objc_setAssociatedObject(self, _cmd, delegate, OBJC_ASSOCIATION_RETAIN_NONATOMIC);
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}
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return delegate;
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}
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- (UIPanGestureRecognizer *)fd_fullscreenPopGestureRecognizer
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{
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UIPanGestureRecognizer *panGestureRecognizer = objc_getAssociatedObject(self, _cmd);
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if (!panGestureRecognizer) {
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panGestureRecognizer = [[UIPanGestureRecognizer alloc] init];
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panGestureRecognizer.maximumNumberOfTouches = 1;
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objc_setAssociatedObject(self, _cmd, panGestureRecognizer, OBJC_ASSOCIATION_RETAIN_NONATOMIC);
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}
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return panGestureRecognizer;
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}
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- (BOOL)fd_viewControllerBasedNavigationBarAppearanceEnabled
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{
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NSNumber *number = objc_getAssociatedObject(self, _cmd);
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if (number) {
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return number.boolValue;
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}
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self.fd_viewControllerBasedNavigationBarAppearanceEnabled = YES;
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return YES;
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}
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- (void)setFd_viewControllerBasedNavigationBarAppearanceEnabled:(BOOL)enabled
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{
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SEL key = @selector(fd_viewControllerBasedNavigationBarAppearanceEnabled);
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objc_setAssociatedObject(self, key, @(enabled), OBJC_ASSOCIATION_RETAIN_NONATOMIC);
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}
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@end
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@implementation UIViewController (FDFullscreenPopGesture)
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- (BOOL)fd_interactivePopDisabled
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{
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return [objc_getAssociatedObject(self, _cmd) boolValue];
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}
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- (void)setFd_interactivePopDisabled:(BOOL)disabled
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{
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objc_setAssociatedObject(self, @selector(fd_interactivePopDisabled), @(disabled), OBJC_ASSOCIATION_RETAIN_NONATOMIC);
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}
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- (BOOL)fd_prefersNavigationBarHidden
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{
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return [objc_getAssociatedObject(self, _cmd) boolValue];
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}
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- (void)setFd_prefersNavigationBarHidden:(BOOL)hidden
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{
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objc_setAssociatedObject(self, @selector(fd_prefersNavigationBarHidden), @(hidden), OBJC_ASSOCIATION_RETAIN_NONATOMIC);
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}
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@end
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