block 中循环引用的问题

来源：互联网发布：photoshop加密软件编辑：程序博客网时间：2024/05/29 11:04

#pragma mark -- 循环引用 //----------------------------------------------------------------------------------------------------

某些block中，使用self会造成循环引用

__weak AppDelegate *weakSelf = self;

dispatch_async(mainQueue, ^(void) {

AppDelegate *strongSelf = weakSelf;

if (strongSelf != nil){

[strongSelf.myTimer invalidate];

[[UIApplication sharedApplication] endBackgroundTask:self.backgroundTaskIdentifier];

strongSelf.backgroundTaskIdentifier = UIBackgroundTaskInvalid;

}

});

__unsafe_unretained contentsViewController* yqContentsViewController = self;

[_threeView reminderBlock:^{

[_alertView setMessage:@"本章节内容暂时为空"];

[_alertView show];

[NSTimer scheduledTimerWithTimeInterval:1.0f target:yqContentsViewController selector:@selector(alertDismissed) userInfo:nil repeats:NO];

}];

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