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21 lines
571 B
Markdown
21 lines
571 B
Markdown
# block 原理
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1. 解决循环引用不应该使用 weakself，而是使用 strong-weak
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```Objective-c
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__weak typeof(self) Weakself = self;
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self.block = ^ {
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__strong typeof(Weakself) Strongself = Weakself;
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dispatch_after(dispatch_time(DISPATCH_TIME_NOW, (int64_t)(2 * NSEC_PER_SEC)), dispatch_get_main_queue(), ^ {
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NSLog(@"%@", Strongself.name);
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});
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};
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self.block();
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```
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字节对齐：k值：8的倍数。
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字节对齐的原因： |