回调函数中出现的警告去除方法

最新推荐文章于 2023-08-30 10:58:25 发布

baduxiaobang

最新推荐文章于 2023-08-30 10:58:25 发布

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分类专栏： Object C-IOS 文章标签： object c IOS 回调警告 Xcode

本文链接：https://blog.youkuaiyun.com/baduxiaobang/article/details/84510419

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本文探讨了在 Objective-C 中如何避免因在回调块内强引用 'self' 而产生的强引用循环问题。通过创建 'self' 的弱引用，可以有效解决这一常见编程陷阱。

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当在object c中使用回调涵数时出现这样的警告：“capturing 'self' strongly in this block is likely to lead to a retain cycle”

我是从这里看的：http://stackoverflow.com/questions/14556605/capturing-self-strongly-in-this-block-is-likely-to-lead-to-a-retain-cycle

The capture of self here is coming in with your implicit property access of self.timerDisp - you can't refer to self or properties on self from within a block that will be strongly retained by self.

You can get around this by creating a weak reference to self before accessing timerDisp inside your block:

_weak typeof(self) weakSelf = self;[player addPeriodicTimeObserverForInterval:CMTimeMakeWithSeconds(0.1,100)queue:nil
                                usingBlock:^(CMTime time){
                                                current+=1;if(current==60){
                                                    min+=(current/60);
                                                    current =0;}[weakSelf.timerDisp setText:[NSString stringWithFormat:@"%02d:%02d",min,current]];}];