UIAlertview 没有正确关闭? [英] UIAlertview not closing properly?

问题描述

我正在使用 UIAlertview 和 viewdidload() 中的一个活动指示器.但我试图在延迟后但在删除 后从超级视图中删除它UIAlertview 使用以下代码我无法在应用程序中执行任何操作.就像一个新的透明层仍在我的视图上方运行.

I am using a UIAlertview and inside that one activity indicator in viewdidload() .But i tried to remove its from superview after a delay but after removing UIAlertview using following code i am not able to do anything in app.Is like a new transparent layer is still running above my view.

代码

 -(void)startAlertActivity
    {
        _alertView = [[UIAlertView alloc] initWithTitle:@"Loading "
                                                message:@"\n"
                                               delegate:self
                                      cancelButtonTitle:nil
                                      otherButtonTitles:nil];

        spinner = [[UIActivityIndicatorView alloc] initWithActivityIndicatorStyle:UIActivityIndicatorViewStyleWhiteLarge];

        spinner.center = CGPointMake(139.5, 75.5); // .5 so it doesn't blur
        [_alertView addSubview:spinner];

        [spinner startAnimating];
        [_alertView show];
        [_alertView performSelector:@selector(stopAlertActivity) withObject:self afterDelay:5.0];


    }

    -(void)stopAlertActivity
    {  [spinner stopAnimating];
        [_alertView dismissWithClickedButtonIndex:0 animated:YES];
    }

ITS 看起来像一个仍在屏幕上运行的透明层，我该如何关闭它?

ITS look like a transparent layer still running on screen,How can i close that?

示例图片....

对我来说，警报现在不在屏幕上，但背景是浅蓝色

崩溃报告

[UIAlertView stopAlertActivity]: unrecognized selector sent to instance 0x9ab5eb0
2013-08-02 12:20:43.822 AssamKart[5719:12203] *** Terminating app due to uncaught exception 'NSInvalidArgumentException', reason: '-[UIAlertView stopAlertActivity]: unrecognized selector sent to instance 0x9ab5eb0'
*** First throw call stack:

推荐答案

你真的应该使用 dispatch_after

you should really be using dispatch_after

_alertView = [[UIAlertView alloc] initWithTitle:@"Loading "
                                        message:@"\n"
                                       delegate:self
                              cancelButtonTitle:nil
                              otherButtonTitles:nil];

spinner = [[UIActivityIndicatorView alloc] initWithActivityIndicatorStyle:UIActivityIndicatorViewStyleWhiteLarge];

spinner.center = CGPointMake(139.5, 75.5); // .5 so it doesn't blur
[_alertView addSubview:spinner];

[spinner startAnimating];
[_alertView show];



double delayInSeconds = 5.0;
dispatch_time_t popTime = dispatch_time(DISPATCH_TIME_NOW, (int64_t)(delayInSeconds * NSEC_PER_SEC));
dispatch_after(popTime, dispatch_get_main_queue(), ^(void){
    [spinner stopAnimating];
    [_alertView dismissWithClickedButtonIndex:0 animated:YES];
});

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