使应用程序处于非活动状态后，UIRefreshControl停止旋转 [英] UIRefreshControl stops spinning after making application inactive

问题描述

我在UITableView中使用UIRefreshControl：

I use UIRefreshControl in a UITableView:

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

带有刷新处理程序：

-(void)refresh {
    dispatch_async(dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_DEFAULT, 0), ^{
        // (...some long running operation...)
        dispatch_async(dispatch_get_main_queue(), ^{
            [self.refreshControl endRefreshing];
        });
    });
}

在长时间运行的操作中，我按下Home按钮使应用程序处于非活动状态。之后，我再次使该应用程序处于活动状态。旋转器冻结（停止旋转），无法将其恢复到初始状态。

During the long running operation I make the application inactive pressing Home button. After that I make the application active again. The spinner freezes (stops spinning) and there is no way to return it to the initial state.

如何解决？

推荐答案

我认为答案有点延迟，但是，今天我在ios 7上看到了类似的问题，ios 6继续旋转，

I think it is a bit delayed answer but , today I saw similar issue on ios 7 , ios 6 continued spinning ,

这里有一些解决方法

- (void)viewWillAppear:(BOOL)animated {
    [super viewWillAppear:animated];
    if(self.refreshControl.isRefreshing) {
        CGPoint offset = self.tableView.contentOffset;
        [self.refreshControl endRefreshing];
        [self.refreshControl beginRefreshing];
        self.tableView.contentOffset = offset;
    }
}

它将停止并再次开始旋转，但仅发生在ios7上，所以也许我应该在ios6上不要这么做

it will stop and start again spinning , but it only happened on ios7 with me , so maybe you should check not to do it on ios6

- (void)viewWillAppear:(BOOL)animated {
    [super viewWillAppear:animated];
    if(self.refreshControl.isRefreshing && [[[UIDevice currentDevice] systemVersion] floatValue] >= 7) {
        CGPoint offset = self.tableView.contentOffset;
        [self.refreshControl endRefreshing];
        [self.refreshControl beginRefreshing];
        self.tableView.contentOffset = offset;
    }
}

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