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YYWeakProxy.m
94 lines (72 loc) · 1.96 KB
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YYWeakProxy.m
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//
// YYWeakProxy.m
// YYKit <https://github.com/ibireme/YYKit>
//
// Created by ibireme on 14/10/18.
// Copyright (c) 2015 ibireme.
//
// This source code is licensed under the MIT-style license found in the
// LICENSE file in the root directory of this source tree.
//
#import "YYWeakProxy.h"
/**
实现的原理: 使用 NSProxy 持有 NSTimer 的 target
不再用 NSTimer 直接持有 self,就不会导致 timer 对 self 的循环强引用了
*/
@implementation YYWeakProxy
- (instancetype)initWithTarget:(id)target {
_target = target;
return self;
}
//类方法
+ (instancetype)proxyWithTarget:(id)target {
return [[YYWeakProxy alloc] initWithTarget:target];
}
#pragma mark - private
- (id)forwardingTargetForSelector:(SEL)selector {
return _target;
}
#pragma mark - over write
//重写NSProxy如下两个方法,在处理消息转发时,将消息转发给真正的Target处理
- (void)forwardInvocation:(NSInvocation *)invocation {
void *null = NULL;
[invocation setReturnValue:&null];
}
- (NSMethodSignature *)methodSignatureForSelector:(SEL)selector {
return [NSObject instanceMethodSignatureForSelector:@selector(init)];
}
- (BOOL)respondsToSelector:(SEL)aSelector {
return [_target respondsToSelector:aSelector];
}
#pragma mark - <NSObject>
- (BOOL)isEqual:(id)object {
return [_target isEqual:object];
}
- (NSUInteger)hash {
return [_target hash];
}
- (Class)superclass {
return [_target superclass];
}
- (Class)class {
return [_target class];
}
- (BOOL)isKindOfClass:(Class)aClass {
return [_target isKindOfClass:aClass];
}
- (BOOL)isMemberOfClass:(Class)aClass {
return [_target isMemberOfClass:aClass];
}
- (BOOL)conformsToProtocol:(Protocol *)aProtocol {
return [_target conformsToProtocol:aProtocol];
}
- (BOOL)isProxy {
return YES;
}
- (NSString *)description {
return [_target description];
}
- (NSString *)debugDescription {
return [_target debugDescription];
}
@end