转载,原文: https://blog.lessfun.com/blog/2014/11/22/when-should-use-weakself-and-strongself-in-objc-block/转载,原文: https://blog.lessfun.com/blog/2014/11/22
阅读背景：
到底什么时候才需要在ObjC的Block中使用weakSelf/strongSelf
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