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POMultiple delegates for one object? (follow-up)
 

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  1. POMultiple delegates for one object? (follow-up)
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    <p>On the question <a href="https://stackoverflow.com/questions/8999818/multiple-delegates-per-one-object">Multiple delegates per one object?</a> one of the answers came up with interesting solution (at least for my naive eyes) : creating a "delegate splitter" that allows an object (in this case UIScrollView) to have multiple delegates (in this case UIScrollViewDelegate). </p> <p>The code is as follows:</p> <pre><code>@interface DelegateSplitter : NSObject -(void)addDelegate:(id)delegate; -(void)addDelegates:(NSArray*)array; @end @interface DelegateSplitter() @property NSMutableSet *delegates; @end @implementation DelegateSplitter -(id)init { self = [super init]; _delegates = [NSMutableSet set]; return self; } -(void)addDelegate:(id)delegate { [_delegates addObject:delegate]; } -(void)addDelegates:(NSArray *)array { [_delegates addObjectsFromArray:array]; } -(void)forwardInvocation:(NSInvocation *)anInvocation { for (id delegate in _delegates) { if([delegate respondsToSelector:anInvocation.selector]) { [anInvocation invokeWithTarget:delegate]; } } } - (NSMethodSignature*) methodSignatureForSelector: (SEL) selector { NSMethodSignature *our = [super methodSignatureForSelector:selector]; NSMethodSignature *delegated = [[_delegates anyObject] methodSignatureForSelector:selector]; return our ? our : delegated; } - (BOOL) respondsToSelector: (SEL) selector { return [[_delegates anyObject] respondsToSelector:selector]; } </code></pre> <p>The problem with this code is that it creates retain cycles, and unlike a normal delegate, you can't declare it as </p> <pre><code>@property (assign) DelegateSplitter *splitter; </code></pre> <p>It does seem however a "better" solution than a wrapper. So is there anyway to avoid the retain cycle ?</p>
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