Question

我希望只有当用户第一次打开我的应用程序时才显示两个警报视图 - 第二次出现在第一次被取消后出现。我把它设置为只显示UIAlertViews以前没有显示过，我不需要帮助。在这种情况下，我需要帮助确定如何连续显示两个警报视图。

- （void）alertView：（UIAlertView *）alertView didDismissWithButtonIndex :( NSInteger）buttonIndex对我不起作用。

这是我的代码 - 请记住这是在didFinishLaunchingWithOptions中：

NSUserDefaults *defaults = [NSUserDefaults standardUserDefaults];
BOOL didFirstLaunch = [defaults boolForKey:@"DidFirstLaunch"];
if (!didFirstLaunch) {
    [defaults setBool:YES forKey:@"DidFirstLaunch"];

    UIAlertView *successAlert = //not important
    [successAlert show];
    [successAlert release];

    //Somehow show second alert after the first is dismissed
}

Answer 1

我将使用GCD & blocks发布一个非常简单的解决方案（ GCD部分是为了防止在另一个线程上创建警报视图然后主线程，回调应该可以安全地执行主线程）。请记住，我只是在5分钟内对此进行了编码，因此您肯定应该努力改进代码。有一件事有点难看的是在我的子类中重写的委托参数。子类的接口可以稍微改变一下，以便更明显地发生什么......

无论如何，这里......

首先创建UIAlertView的子类，使其看起来有点像以下......

@interface FSAlertView () <UIAlertViewDelegate>

@property (nonatomic, copy) void (^dismissHandler)(NSInteger buttonIndex);

@end


@implementation FSAlertView

@synthesize dismissHandler = _dismissHandler;

- (void)showWithDismissHandler:(void (^)(NSInteger buttonIndex))dismissHandler
{
    self.dismissHandler = dismissHandler;

    self.delegate = self;

    [self show];
}

// Alert view delegate

- (void)alertView:(UIAlertView *)alertView didDismissWithButtonIndex:(NSInteger)buttonIndex
{
    dispatch_async(dispatch_get_main_queue(), ^ {

        if (_dismissHandler)
        {
            _dismissHandler(buttonIndex);
        }

    });
}

现在，在应用中，我们可以创建如下的警告视图......

FSAlertView *alert1 = [[FSAlertView alloc] initWithTitle:@"Alert 1"
                                                 message:@"Some message"
                                                delegate:nil
                                       cancelButtonTitle:@"Cancel"
                                       otherButtonTitles:@"Show 2nd Alert", nil];

[alert1 showWithDismissHandler:^ (NSInteger buttonIndex) {

    NSLog(@"button pressed: %d", buttonIndex);

    if (buttonIndex == 1)
    {
        UIAlertView *alert2 = [[UIAlertView alloc] initWithTitle:@"Alert 2"
                                                         message:@"Hi!"
                                                        delegate:nil
                                               cancelButtonTitle:@"OK"
                                               otherButtonTitles:nil];
        [alert2 show];
    }

}];

Answer 2

如果我理解你的问题，那么这可能有所帮助：

 UIAlertView *firstAlert = [[UIAlertView alloc] initWithTitle:@"Alert 1" message:nil delegate:self cancelButtonTitle:nil otherButtonTitles:nil, nil];
    [firstAlert show];
    [self performSelector:@selector(test:) withObject:firstAlert afterDelay:2];
    [firstAlert release];

    UIAlertView *secondAlert = [[UIAlertView alloc] initWithTitle:@"Alert 2" message:nil delegate:self cancelButtonTitle:nil otherButtonTitles:nil, nil];
    [secondAlert show];
    [self performSelector:@selector(test:) withObject:secondAlert afterDelay:2];
    [secondAlert release];


-(void)test:(UIAlertView*)alert{
    [alert dismissWithClickedButtonIndex:-1 animated:YES];
}

这将一个接一个地显示两个警报视图。

注意：我不确定您是否使用取消按钮解除警报，因此我会在几秒钟后自动解除警报。

Answer 3

试试这个：

UIAlertView *firstAlert = [[UIAlertView alloc] initWithTitle:@"Title" message:@"Message" delegate:self cancelButtonTitle:@"Cancel" otherButtonTitles:@"Ok", nil];
[firstAlert setTag:444];
[firstAlert show];
firstAlert = nil;

AlertView委派方法：

- (void)alertView:(UIAlertView *)alertView didDismissWithButtonIndex:(NSInteger)buttonIndex
{
    switch (alertView.tag) {
        case 444:
        {
            //Cancel ButtonIndex = 0
            if (buttonIndex == 1) {
                UIAlertView *secondAlert = [[UIAlertView alloc] initWithTitle:@"Title 2" message:@"Message2" delegate:self cancelButtonTitle:@"Cancel" otherButtonTitles:@"Dismiss", nil];
                [secondAlert setTag:555];
                [secondAlert show];
                secondAlert = nil;
            } 
        }
        break;
        case 555:
        {
            if (buttonIndex == 1) {
                NSLog(@"Code Here");
            }
        }
        break;
    }
}

连续两个UIAlertView在didFinishLaunchingWithOptions中

3 个答案: