Capturing self strongly in this block is likely to lead to a retain cycle
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在block里引用self，xcode给出了这个warning：
Capturing self strongly in this block is likely to lead to a retain cycle
在SO上搜索了一番，好像和我的场景不太一样。最后我解决的办法是：
__block AddShopViewController *weakSelf = self;
然后在block里调用weakSelf：
[weakSelf clearFormAfterAppend];
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- Capturing 'self' strongly in this block is likely to lead to a retain cycle
- capturing self strongly in this block is likely to lead to a retain cycle
- Capturing self strongly in this block is likely to lead to a retain cycle
- Capturing 'self' strongly in this block is likely to lead to a retain cycle
- Capturing 'self' strongly in this block is likely to lead to a retain cycle
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- Capturing 'self' strongly in this block is likely to lead to a retain cycle
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- Capturing 'self' strongly in this block is likely to lead to a retain cycle [duplicate]
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- Capturing self strongly in this block is likely to lead to retain cycle解决方案
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