@interface MyProxy: NSProxy
+ (instancetype)proxyWithTarget:(id)target;
@property (weak, nonatomic) id target;
@end
@implementation MyProxy
+ (instancetype)proxyWithTarget:(id)target{
MyProxy *proxy = [MyProxy alloc];
proxy.target = target;
return proxy;
}
- (NSMethodSignature *)methodSignatureForSelector:(SEL)sel
{
return [self.target methodSignatureForSelector:sel];
}
- (void)forwardInvocation:(NSInvocation *)invocation
{
[invocation invokeWithTarget:self.target];
}
@end
调用
self.timer = [NSTimer scheduledTimerWithTimeInterval:1.0 target:[MyProxy proxyWithTarget:self] selector:@selector(timerTest) userInfo:nil repeats:YES];
MyProxy *p = [MyProxy proxyWithTarget:self] ;
[p isKindOfClass:[self class]]; //返回1，因为内部消息转发到self
