ios - 从推送通知中将 JSON 有效负载数据转换为字符串

Question

我试图将我的 JSON 有效负载数据从推送通知中获取到字符串中。

{
 aps = {
 alert = "BG push";

 sound = ,
 };
}

我研究了 SO 和 Parse 并尝试了各种方法，包括 Apple Push Notification with Sending Custom Data但是我的字符串重新运行 (null) 或如本示例中的 JSON 格式

我想要 alert数据 "BG Push"在一个字符串中，所以我可以把它放在一个警报 View 中

 - (void)application:(UIApplication *)application didReceiveRemoteNotification:(NSDictionary *)userInfo {

    if ( application.applicationState == UIApplicationStateActive ){

        // app was already in the foreground
        [PFPush handlePush:userInfo]; //<-----userInfo returns payload data in JSON format

    }

        else {                
            // app was just brought from background to foreground
            NSLog(@"App was in background and opened from Push message");

            UIAlertView *alert = [[UIAlertView alloc]
                                  initWithTitle:@"Megger"
                                        message: [NSString stringWithFormat:@"%@", userInfo]
                                       delegate:self
                              cancelButtonTitle: @"Ok"
                              otherButtonTitles: nil];

            [alert show];

        }
  }

Answer 1

NSString *alert = userInfo[@"aps"][@"alert"];

UIAlertView *alertView = [[UIAlertView alloc]
                              initWithTitle:@"Megger"
                              message: [NSString stringWithFormat:@"%@", alert]
                              delegate:self
                              cancelButtonTitle: @"Ok"
                              otherButtonTitles: nil];

[alertView show];