检测哪个 UIAlertView 被点击

Question

我需要在加载应用程序时弹出警报...我称之为“完成启动”.. 单击“确定”按钮后需要显示另一条警报消息，我使用 clickedButtonAtIndex...

现在，当我单击“确定”按钮时，它会一次又一次地调用...警报视图..

我只需要调用一次...该怎么办？

-(BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions {    

    // Override point for customization after application launch.

    // Add the tab bar controller's view to the window and display.
    [window addSubview:tabBarController.view];
    [window makeKeyAndVisible];
    viewControllersList = [[NSMutableArray alloc] init];

    UIAlertView *alert = [[UIAlertView alloc] initWithTitle:@"Alert" message:@"Alow this app to use your GPS location"
    delegate:self cancelButtonTitle:@"No" otherButtonTitles:@"Yes", nil];
    [alert show];
    [alert release];

}

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


    if (buttonIndex==0) {
        NSLog(@"NO");
    }
    else    {

        NSLog(@"Yes");
        UIAlertView *alert = [[UIAlertView alloc] initWithTitle:@"Alert" message:@"Do you want's to receive Push messages."
        delegate:self cancelButtonTitle:@"No" otherButtonTitles:@"Yes", nil];
        [alert show];
        [alert release];
    }

}

@提前致谢。

Answer 1

在第二个alertView中设置delegate:nil
我是说

if (buttonIndex==0) { NSLog(@"NO"); } else {

NSLog(@"Yes");
UIAlertView *alert = [[UIAlertView alloc] initWithTitle:@"Alert" message:@"Do you want's to receive Push messages."
delegate:nil cancelButtonTitle:@"No" otherButtonTitles:@"Yes", nil];
[alert show];
[alert release];
}

Answer 2

您还可以向 AlertView 添加一个标签，并稍后在 clickedButtonAtIndex 方法上检查该标签，

        UIAlertView* alert = [[UIAlertView alloc]initWithTitle:@"" message:@"All local datawill be erased. Erase local data?" delegate:self cancelButtonTitle:nil otherButtonTitles:@"Erase", @"Cancel",nil];
        alert.tag =123; // added the tag so we can prevent other message boxes ok button to mix up 
        [alert show];

然后

    -(void)alertView:(UIAlertView *)alertView clickedButtonAtIndex:(NSInteger)buttonIndex{
    if (buttonIndex ==0 && alertView.tag==123){
       // Do what ever you wish
    }
}

Answer 3

定义每个 UIAlertView 并在委托中查找要响应的警报：

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

    if(alert1) {
        if (buttonIndex==0) { 

            NSLog(@"NO"); 
        } else {

            NSLog(@"Yes");
            UIAlertView *alert = [[UIAlertView alloc] initWithTitle:@"Alert" message:@"Do you want's to receive Push messages." delegate:self cancelButtonTitle:@"No" otherButtonTitles:@"Yes", nil];
            [alert show];
            [alert release];
        }
    } else {

        /*  the second alertview  using the same buttonIndex  */
    }

}

Answer 4

如果您想要接收位置，只需请求，系统就会自动为您显示消息。请按照以下示例操作：

- (void)applicationDidFinishLaunching:(UIApplication *)application {
[window addSubview:tabBarController.view];
// Create a location manager instance to determine if location services are enabled. This manager instance will be
// immediately released afterwards.
CLLocationManager *manager = [[CLLocationManager alloc] init];
if (manager.locationServicesEnabled == NO) {
    UIAlertView *servicesDisabledAlert = [[UIAlertView alloc] initWithTitle:@"Location Services Disabled" message:@"You currently have all location services for this device disabled. If you proceed, you will be asked to confirm whether location services should be reenabled." delegate:nil cancelButtonTitle:@"OK" otherButtonTitles:nil];
    [servicesDisabledAlert show];
    [servicesDisabledAlert release];
}
[manager release];                                  

}

http://developer.apple.com/library/ios/#samplecode/LocateMe/Listings/Classes_AppDelegate_m.html%23//apple_ref/doc/uid/DTS40007801-Classes_AppDelegate_m-DontLinkElementID_4

相同用于推送通知。

Answer 5

虽然你已经有了很多实现解决方案......但我认为更好的做法是为每个 AlertView 分配一个标签，并在检测点击的按钮之前检查调用 AlertView 的标签。希望这会有所帮助。
@Gerard：虽然位置管理器和推送通知服务都会引发系统生成的消息，但用户可以检查这些消息，以免再次显示。因此，更好的 HIG 投诉方法是在需要推送或位置管理器时应用程序生成消息。