iphone - AlertView 正在运行，但未显示 didReceiveRemoteNotification

Question

使用调试器，我已确保[alertView show];被调用，但对话框不可见，我还需要做什么才能让它显示？

- (void)application:(UIApplication *)application didReceiveRemoteNotification:(NSDictionary *)userInfo
{
    if( [[userInfo objectForKey:@"aps"] objectForKey:@"alert"] != NULL)
    {
        NSString *msg = [[userInfo objectForKey:@"aps"] objectForKey:@"alert"];
        if(msg != nil) {
            UIAlertView *alertView = [[UIAlertView alloc] initWithTitle:@"Usage Alert"
            message:msg  delegate:self cancelButtonTitle:@"Cancel" otherButtonTitles:@"Ok", nil];
            [alertView show];
        }
    }
}

Answer 1

在 View Controller .h 文件中，您需要声明 <UIAlertViewDelegate>像这样，在左大括号之前，用大于和小于符号封装:

#import <UIKit/UIKit.h>

@interface YourViewControllersName : UIViewController <UIAlertViewDelegate> {

   // your variable declarations are here...
}

 // your method declarations are here...