//
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// UIScrollView+ZFPlayer.m
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// ZFPlayer
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//
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// Copyright (c) 2016年 任子丰 ( http://github.com/renzifeng )
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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
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// all 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
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// THE SOFTWARE.
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#import "ZFKVOController.h"
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@interface ZFKVOEntry : NSObject
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@property (nonatomic, weak) NSObject *observer;
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@property (nonatomic, strong) NSString *keyPath;
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@end
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@implementation ZFKVOEntry
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@synthesize observer;
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@synthesize keyPath;
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@end
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@interface ZFKVOController ()
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@property (nonatomic, weak) NSObject *target;
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@property (nonatomic, strong) NSMutableArray *observerArray;
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@end
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@implementation ZFKVOController
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- (instancetype)initWithTarget:(NSObject *)target {
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self = [super init];
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if (self) {
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_target = target;
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_observerArray = [[NSMutableArray alloc] init];
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}
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return self;
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}
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- (void)safelyAddObserver:(NSObject *)observer
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forKeyPath:(NSString *)keyPath
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options:(NSKeyValueObservingOptions)options
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context:(void *)context {
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NSObject *target = _target;
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if (target == nil) return;
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BOOL removed = [self removeEntryOfObserver:observer forKeyPath:keyPath];
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if (removed) {
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// duplicated register
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NSLog(@"duplicated observer");
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}
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@try {
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[target addObserver:observer
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forKeyPath:keyPath
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options:options
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context:context];
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ZFKVOEntry *entry = [[ZFKVOEntry alloc] init];
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entry.observer = observer;
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entry.keyPath = keyPath;
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[_observerArray addObject:entry];
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} @catch (NSException *e) {
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NSLog(@"ZFKVO: failed to add observer for %@\n", keyPath);
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}
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}
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- (void)safelyRemoveObserver:(NSObject *)observer
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forKeyPath:(NSString *)keyPath {
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NSObject *target = _target;
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if (target == nil) return;
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BOOL removed = [self removeEntryOfObserver:observer forKeyPath:keyPath];
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if (removed) {
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// duplicated register
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NSLog(@"duplicated observer");
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}
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@try {
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if (removed) {
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[target removeObserver:observer
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forKeyPath:keyPath];
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}
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} @catch (NSException *e) {
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NSLog(@"ZFKVO: failed to remove observer for %@\n", keyPath);
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}
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}
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- (void)safelyRemoveAllObservers {
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__block NSObject *target = _target;
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if (target == nil) return;
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[_observerArray enumerateObjectsUsingBlock:^(id obj, NSUInteger idx, BOOL *stop) {
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ZFKVOEntry *entry = obj;
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if (entry == nil) return;
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NSObject *observer = entry.observer;
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if (observer == nil) return;
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@try {
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[target removeObserver:observer
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forKeyPath:entry.keyPath];
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} @catch (NSException *e) {
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NSLog(@"ZFKVO: failed to remove observer for %@\n", entry.keyPath);
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}
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}];
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[_observerArray removeAllObjects];
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}
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- (BOOL)removeEntryOfObserver:(NSObject *)observer
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forKeyPath:(NSString *)keyPath {
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__block NSInteger foundIndex = -1;
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[_observerArray enumerateObjectsUsingBlock:^(id obj, NSUInteger idx, BOOL *stop) {
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ZFKVOEntry *entry = (ZFKVOEntry *)obj;
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if (entry.observer == observer &&
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[entry.keyPath isEqualToString:keyPath]) {
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foundIndex = idx;
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*stop = YES;
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}
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}];
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if (foundIndex >= 0) {
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[_observerArray removeObjectAtIndex:foundIndex];
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return YES;
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}
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return NO;
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}
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@end
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