处理Block中的self问题（Capturing 'self' strongly in this block is likely to lead to a retain cycle）

警告：ARC Retain Cycle

Capturing 'self' strongly in this block is likely to lead to a retain cycle

代码：

self.refreshHeader.beginRefreshingBlock=^(){

// 后台执行：

dispatch_async(dispatch_get_global_queue(0, 0), ^{

sleep(2);

dispatch_async(dispatch_get_main_queue(), ^{

// 主线程刷新视图

weakSelf.total=20;

[self.mainTableView reloadData];

[self.refreshHeader endRefreshing];

});

});

};

针对这个问题,解决很简单，将self弱化即可。修改后代码如下：

__weak MainViewController * weakSelf = self;

self.refreshHeader.beginRefreshingBlock=^(){

// 后台执行：

dispatch_async(dispatch_get_global_queue(0, 0), ^{

sleep(2);

dispatch_async(dispatch_get_main_queue(), ^{

// 主线程刷新视图

weakSelf.total=20;

[weakSelf.mainTableView reloadData];

[weakSelf.refreshHeader endRefreshing];

});

});

};