临时显示其他选项卡时，UIRefreshControl会冻结（iOS 7） [英] UIRefreshControl freezes when temporarily showing other tab (iOS 7)

问题描述

我在其中一个标签上有以下内容：

I have the following on one of my tabs:

- (void)viewDidLoad
{
    [super viewDidLoad];

    self.clearsSelectionOnViewWillAppear = YES;

    UIRefreshControl* refreshControl = [[UIRefreshControl alloc] init];
    refreshControl.attributedTitle   = [[NSAttributedString alloc] initWithString:@"Sync"];
    [refreshControl addTarget:self 
                       action:@selector(refresh:) 
             forControlEvents:UIControlEventValueChanged];
    self.refreshControl = refreshControl;

    //### Workaround: http://stackoverflow.com/a/19126113/1971013
    dispatch_async(dispatch_get_main_queue(), ^
    {
        [self.refreshControl beginRefreshing];
        [self.refreshControl endRefreshing];
    });
}

- (void)refresh:(id)sender
{
    if ([Settings sharedSettings].haveAccount == YES)
    {
        [[DataManager sharedManager] synchronizeWithServer:^(NSError* error)
        {
            [sender endRefreshing];
        }];
    }
    else
    {
        [sender endRefreshing];
    }
}

当拉下表时，刷新控制开始正常旋转。

Refresh control starts spinning normally when pulling down table.

然而，当我旋转，很快显示另一个标签然后返回时，刷新控制停止旋转。

However, when I, while it spins, shown an other tab shortly and then go back, the refresh control stops spinning.

知道为什么吗？

推荐答案

尝试从 viewDidLoad 到 viewWillAppear ：

//### Workaround: http://stackoverflow.com/a/19126113/1971013
dispatch_async(dispatch_get_main_queue(), ^
{
    [self.refreshControl beginRefreshing];
    [self.refreshControl endRefreshing];
});

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