Question

我在popViewControllerAnimated:委托方法UIalertView中完成时，方法alertView:didDismissWithButtonIndex:中的动画有问题。它不稳定且速度快（使用Xcode 7.3.1）。谁能理解为什么？

- (void)alertView:(UIAlertView *)alertView didDismissWithButtonIndex:(NSInteger)buttonIndex
{
    if (buttonIndex != alertView.cancelButtonIndex)
    {
        // animation of popViewControllerAnimated: is not working correctly
        [self.navigationController popViewControllerAnimated:YES];
    }
}

奇怪的是，这段代码没有问题：

- (void)alertView:(UIAlertView *)alertView didDismissWithButtonIndex:(NSInteger)buttonIndex
{
    if (buttonIndex != alertView.cancelButtonIndex)
    {
        // code is running om main thread
        if ([[NSThread currentThread]isMainThread])  {
            // still - by using GCD and go to main thread, the animation works!!
            dispatch_async(dispatch_get_main_queue(), ^{
                [self.navigationController popViewControllerAnimated:YES];
            });
        }
    }
}

而且：

- (void)alertView:(UIAlertView *)alertView clickedButtonAtIndex:(NSInteger)buttonIndex {

    if(buttonIndex != alertView.cancelButtonIndex)
    {
        // no problem with animation when done in alertView:clickedButtonAtIndex:
        [self.navigationController popViewControllerAnimated:YES];
    }
}

我知道UIAlertView已被弃用了一段时间，是不是因为这个？自2012年以来，该代码在应用程序中未受影响，并且最近开始表现得很奇怪。

Answer 1

您可以尝试使用willDismissWithButtonIndex代替didDismissWithButtonIndex

- (void)alertView:(UIAlertView *)alertView willDismissWithButtonIndex:(NSInteger)buttonIndex
{
    if (buttonIndex != alertView.cancelButtonIndex)
    {
        [self.navigationController popViewControllerAnimated:YES];
    }
}

对我来说这项工作还好！我希望这可以帮到你

PopViewControllerAnimated的蹩脚动画：来自alertView：didDismissWithButtonIndex：

1 个答案: