iphone - 如果 alertView 的 buttonIndex 没有被点击，则在持续时间后执行 Action

Question

我想显示一个大约 2 秒的临时警报，让用户有机会取消操作。如果用户单击取消按钮，则不会调用后续方法。但是，如果用户没有按取消，则将调用后续方法。有人对如何使这项工作有任何想法吗？

我有一个看起来像这样的设置：

-(void) buttonPress {

    //alert with message and cancel button
    UIAlertView *alert = [[UIAlertView alloc] initWithTitle:@"2 seconds to cancel" 
    message:@"Push Cancel to stop" delegate:self cancelButtonTitle:@"Cancel" 
    otherButtonTitles:nil, nil];
    alert.tag = 1;
    [alert show];
    return;
}

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

    if (buttonIndex == 0 && alertView.tag == 1) {

        //action cancelled
    }
    else {

        //action not cancelled
    }
}

score 5 · Accepted Answer

试试这个在 2 秒后关闭警报：

-(void) buttonPress {

    //alert with message and cancel button
    UIAlertView *alert = [[UIAlertView alloc] initWithTitle:@"2 seconds to cancel" 
    message:@"Push Cancel to stop" delegate:self cancelButtonTitle:@"Cancel" 
    otherButtonTitles:nil, nil];
    alert.tag = 1;
    [alert show];

    // Create the perform selector method with alert view object and time-period
    [self performSelector:@selector(dismissAlertView:) withObject:alert afterDelay:2];
    return;
}


// Dismiss the alert view after time-Period     
-(void)dismissAlertView:(UIAlertView *)alert
{
    [alert dismissWithClickedButtonIndex:-1 animated:YES];

}

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

    if (buttonIndex == 0 && alertView.tag == 1) {

        //action cancelled
        [NSObject cancelPreviousPerformRequestsWithTarget:self selector:@selector(dismissAlertView:) object:alertView];
    }
    else {

        //action not cancelled
    }
}

score 0 · Accepted Answer

您可以创建一种方法，该方法将在 2 秒后调用并关闭警报视图并执行您想要执行的任务。

您可以按如下方式调用该方法 -

[self performSelector:@selector(yourMethodName) withObject:nil afterDelay:2];

score 0 · Accepted Answer

使用您想要的延迟（2 秒）设置一个 NSTimer。在计时器的委托中，使用适当的参数调用 UIAlertView 的委托。

score 0 · Accepted Answer

NSTimer当您显示警报（非重复）并在委托回调中取消它时开始。如果计时器触发，请关闭警报并调用您的后续任务。

score 0 · Accepted Answer

下面是逻辑..

大约 2 秒的临时警报，让用户有机会取消操作。

设置一个标志变量以获取指示天气是否继续。
如果用户单击取消按钮，则不会调用后续方法。

UIAlertview 出现在用户面前并将标志设置为 false 时立即启动计时器 2 秒。
但是，如果用户没有按取消，则将调用后续方法。

隐藏 UIAlertview，停止 2 秒计时器和标志值将为真并调用您的后续方法以继续您的逻辑。

score 0 · Accepted Answer

如果您的应用程序在显示警报视图后进入后台，这甚至会运行。

UIBackgroundTaskIdentifier bgTask = 0;
    UIApplication  *app = [UIApplication sharedApplication];
    bgTask = [app beginBackgroundTaskWithExpirationHandler:^{
        [app endBackgroundTask:bgTask];
    }];

   NSTimer* currentTimer = [NSTimer scheduledTimerWithTimeInterval:2 target:self
                                                  selector:@selector(YourMethodName) userInfo:nil repeats:YES];

享受！！....

score 0 · Accepted Answer

使用此代码：

[NSTimer scheduledTimerWithTimeInterval:2.0 target:self selector:@selector(FunctionName) userInfo:nil repeats:NO];
-(Void)YourFunctionName
{
}

score 0 · Accepted Answer

尝试这个：

[NSTimer scheduledTimerWithTimeInterval:2.0 target:self selector:@selector(popViewAfterMessage) userInfo:nil repeats:NO];

-(void) popViewAfterMessage {
    // your code here...
}

score -1 · Accepted Answer

使用这个功能：

- (void)hideAllAlerts {

    for (UIWindow* window in [UIApplication sharedApplication].windows) {
        NSArray* subviews = window.subviews;
        if ([subviews count] > 0)
            if ([[subviews objectAtIndex:0] isKindOfClass:[UIAlertView class]])
                [(UIAlertView *)[subviews objectAtIndex:0] dismissWithClickedButtonIndex:[(UIAlertView *)[subviews objectAtIndex:0] cancelButtonIndex] animated:NO];
    }
}

更改您的代码：

-(void) buttonPress {

    //alert with message and cancel button
    UIAlertView *alert = [[UIAlertView alloc] initWithTitle:@"2 seconds to cancel" 
    message:@"Push Cancel to stop" delegate:self cancelButtonTitle:@"Cancel" 
    otherButtonTitles:nil, nil];
    alert.tag = 1;
    [alert show];
    [NSTimer scheduledTimerWithTimeInterval:2.0 target:self selector:@selector(hideAllAlerts) userInfo:nil repeats:NO];

    return;
}

score -1 · Accepted Answer

-1

 [self performSelector:@selector(sendMail) withObject:nil afterDelay:1.0];

于 2013-06-25T07:39:10.750 回答

iphone - 如果 alertView 的 buttonIndex 没有被点击，则在持续时间后执行 Action

10 回答 10

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