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Referring to weak self inside a nested block

时间:2015-08-30 17:10:39      阅读:320      评论:0      收藏:0      [点我收藏+]

Your code will work fine: the weak reference will not cause a retain cycle as you explicitly instruct ARC not to increase the retainCount of your weak object. For best practice, however, you should create a strong reference of your object using the weak one. This won‘t create a retain cycle either as the strong pointer within the block will only exist until the block completes (it‘s only scope is the block itself).

__weak typeof(self) weakSelf = self;
[self doABlockOperation:^{
    __strong typeof(weakSelf) strongSelf = weakSelf;
    if (strongSelf) {
        ...
    }
}];

Referring to weak self inside a nested block

原文:http://www.cnblogs.com/pencilCool/p/4771143.html

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