刷新指示符上的UIRefreshControl文本叠加

Question

我开始使用iOS 7 SDK在XCode 5下进行编程.当我使用'attributedText' 创建UITableViewController时UIRefreshControl,我已经将文本覆盖在UIRefreshControl图形顶部(圆形进度动画).

但当我拉下并松开手指时,文字会跳到正常位置.为什么会这样？

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

    self.refreshControl = refreshControl;

在结束之前:

后UIRefreshControl释放:

Answer 1

请试试这个.

- (void)viewDidLoad
{
    [super viewDidLoad];

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

    dispatch_async(dispatch_get_main_queue(), ^{
        [self.refreshControl beginRefreshing];
        [self.refreshControl endRefreshing];
    });

}