(摘抄防丟失)多重代理源碼

關(guān)于多重代理源碼 粘貼在一個(gè).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;

}

//轉(zhuǎn)發(fā)方法調(diào)用給所有delegate

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

for (id target in self.weakRefTargets) {

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

[anInvocation invokeWithTarget:target];

}

}

}

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