(摘抄防丢失)多重代理源码

关于多重代理源码 粘贴在一个.m里即可，原文及其用法如：原文

@interface MultipleDelegateProxy ()

@property (nonatomic, strong) NSPointerArray *weakRefTargets;

@end

@implementation MultipleDelegateProxy

- (void)setDelegateTargets:(NSArray *)delegateTargets{

self.weakRefTargets = [NSPointerArray weakObjectsPointerArray];

for (id delegate in delegateTargets) {

[self.weakRefTargets addPointer:(__bridge void *)delegate];

}

}

- (BOOL)respondsToSelector:(SEL)aSelector{

if ([super respondsToSelector:aSelector]) {

return YES;

}

for (id target in self.weakRefTargets) {

if ([target respondsToSelector:aSelector]) {

return YES;

}

}

return NO;

}

- (NSMethodSignature *)methodSignatureForSelector:(SEL)aSelector{

NSMethodSignature *sig = [super methodSignatureForSelector:aSelector];

if (!sig) {

for (id target in self.weakRefTargets) {

if ((sig = [target methodSignatureForSelector:aSelector])) {

break;

}

}

}

return sig;

}

//转发方法调用给所有delegate

- (void)forwardInvocation:(NSInvocation *)anInvocation{

for (id target in self.weakRefTargets) {

if ([target respondsToSelector:anInvocation.selector]) {

[anInvocation invokeWithTarget:target];

}

}

}