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

错误ID

ListViewController.m:135:10: Capturing 'self' strongly in this block is likely to lead to a retain cycle

开了ARC

    [_tableView setPullToRefreshHandler:^{
        [self dataDidRefresh:nil];
    }];

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你把self转换一下加上block字段之后就不会被retain了

__block ViewController *controller = self;
[_tableView setPullToRefreshHandler:^{
[controller dataDidRefresh:nil];
}];

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在ARC下不用__block 而是用 __weak 为了避免出现循环引用