UIRefreshControl第一次运行时标题偏移不正确，有时标题丢失 [英] UIRefreshControl incorrect title offset during first run and sometimes title missing

问题描述

第一次启动UIRefreshControl时，文本偏移错误...稍后有时刷新文本根本不会显示，只是spiny是可见的

The text is offset wrong by the first launch of UIRefreshControl... later sometimes the refresh text doesn't show up at all and just the spiny is visible

我不认为我有这个问题与iOS6 ...可能与iOS7相关

I don't think i had this issue with iOS6... might be related to iOS7

在一个UITableViewController作为一个孩子添加到VC，它驻留在modal present UINavigationController

Is in a UITableViewController added as a child to a VC, which resides in a modal presented UINavigationController

- (void)viewDidLoad {

    [super viewDidLoad];

    [self setRefreshControlText:@"Getting registration data"];
    [self.refreshControl beginRefreshing];
}

- (void)setRefreshControlText:(NSString *)text {

    UIFont * font = [UIFont fontWithName:@"Helvetica-Light" size:10.0];
    NSDictionary *attributes = @{NSFontAttributeName:font, NSForegroundColorAttributeName : [UIColor blackColor]};
    self.refreshControl.attributedTitle = [[NSAttributedString alloc] initWithString:text attributes:attributes];

}

推荐答案

这绝对是一个iOS 7的错误，弄清楚究竟是什么原因造成的。它似乎与视图层次有关 - 添加我的UITableViewController作为一个子视图到一个包装器视图控制器似乎为我修复它，虽然这个bug从iOS 7通用回来了。

This is definitely an iOS 7 bug, but I haven't figured out exactly what caused it. It appears to have something to do with the view hierarchy — adding my UITableViewController as a child view to a wrapper view controller appeared to fix it for me at first, although the bug is back since iOS 7 GM.

在创建刷新视图后，将UITableViewController中添加以下代码看起来像修复了定位问题：

It looks like adding the following code to your UITableViewController after creating the refresh view fixes the positioning issue for good:

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

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