iOS如何存储多个delegate

可以使用NSHashTable存储weak指针

NSObject *obj = [[NSObject alloc] init];
__weak NSObject *weakobj1 = obj;
NSHashTable *table = [NSHashTable weakObjectsHashTable];
 [table addObject:weakobj1];

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NSObject *obj = [[NSObject alloc] init];
__weak NSObject *weakobj1 = obj;
NSHashTable *table = [NSHashTable weakObjectsHashTable];
 [table addObject:weakobj1];
weakobj1 = nil;
 obj = nil;

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