ZFKVOController.m
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//
// UIScrollView+ZFPlayer.m
// ZFPlayer
//
// Copyright (c) 2016年 任子丰 ( http://github.com/renzifeng )
//
// Permission is hereby granted, free of charge, to any person obtaining a copy
// of this software and associated documentation files (the "Software"), to deal
// in the Software without restriction, including without limitation the rights
// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
// copies of the Software, and to permit persons to whom the Software is
// furnished to do so, subject to the following conditions:
//
// The above copyright notice and this permission notice shall be included in
// all copies or substantial portions of the Software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
// THE SOFTWARE.
#import "ZFKVOController.h"
@interface ZFKVOEntry : NSObject
@property (nonatomic, weak) NSObject *observer;
@property (nonatomic, copy) NSString *keyPath;
@end
@implementation ZFKVOEntry
@end
@interface ZFKVOController ()
@property (nonatomic, weak) NSObject *target;
@property (nonatomic, strong) NSMutableArray *observerArray;
@end
@implementation ZFKVOController
- (instancetype)initWithTarget:(NSObject *)target {
self = [super init];
if (self) {
_target = target;
_observerArray = [[NSMutableArray alloc] init];
}
return self;
}
- (void)safelyAddObserver:(NSObject *)observer
forKeyPath:(NSString *)keyPath
options:(NSKeyValueObservingOptions)options
context:(void *)context {
if (_target == nil) return;
NSInteger indexEntry = [self indexEntryOfObserver:observer forKeyPath:keyPath];
if (indexEntry != NSNotFound) {
// duplicated register
NSLog(@"duplicated observer");
} else {
@try {
[_target addObserver:observer
forKeyPath:keyPath
options:options
context:context];
ZFKVOEntry *entry = [[ZFKVOEntry alloc] init];
entry.observer = observer;
entry.keyPath = keyPath;
[_observerArray addObject:entry];
} @catch (NSException *e) {
NSLog(@"ZFKVO: failed to add observer for %@\n", keyPath);
}
}
}
- (void)safelyRemoveObserver:(NSObject *)observer
forKeyPath:(NSString *)keyPath {
if (_target == nil) return;
NSInteger indexEntry = [self indexEntryOfObserver:observer forKeyPath:keyPath];
if (indexEntry == NSNotFound) {
// duplicated register
NSLog(@"duplicated observer");
} else {
[_observerArray removeObjectAtIndex:indexEntry];
@try {
[_target removeObserver:observer
forKeyPath:keyPath];
} @catch (NSException *e) {
NSLog(@"ZFKVO: failed to remove observer for %@\n", keyPath);
}
}
}
- (void)safelyRemoveAllObservers {
if (_target == nil) return;
[_observerArray enumerateObjectsUsingBlock:^(ZFKVOEntry *entry, NSUInteger idx, BOOL *stop) {
if (entry == nil) return;
NSObject *observer = entry.observer;
if (observer == nil) return;
@try {
[_target removeObserver:observer
forKeyPath:entry.keyPath];
} @catch (NSException *e) {
NSLog(@"ZFKVO: failed to remove observer for %@\n", entry.keyPath);
}
}];
[_observerArray removeAllObjects];
}
- (NSInteger)indexEntryOfObserver:(NSObject *)observer
forKeyPath:(NSString *)keyPath {
__block NSInteger foundIndex = NSNotFound;
[_observerArray enumerateObjectsUsingBlock:^(ZFKVOEntry *entry, NSUInteger idx, BOOL *stop) {
if (entry.observer == observer &&
[entry.keyPath isEqualToString:keyPath]) {
foundIndex = idx;
*stop = YES;
}
}];
return foundIndex;
}
@end