Question

如果设备未连接到xcode，我看到太多关于静音推送通知不起作用的问题，但我找不到真正的答案。我使用Silent APN在后台启动进程，然后触发本地Push通知

服务器发送此信息：
```
"_metadata" =     {
    bagde = 1;
    pushText = "semeone has sent you a message!!";
    sender = "semeone";
};
aps =     {
    "content-available" = 1;
};
```
_metadata是用于触发本地通知的自定义信息，我没有在aps中包含徽章，pushText ..因为我是静音推送通知。

客户端应该在didReceiveRemoteNotification中获取信息，

-(void)application:(UIApplication *)application didReceiveRemoteNotification:(NSDictionary *)userInfo fetchCompletionHandler:(void (^)(UIBackgroundFetchResult))completionHandler
{
if(application.applicationState != UIApplicationStateActive ){
        if([userInfo[@"aps"][@"content-available"] intValue]== 1) //it's the silent notification
        {
            //start a background task 
            UIBackgroundTaskIdentifier preLoadPNTask = [[UIApplication sharedApplication] beginBackgroundTaskWithExpirationHandler:^{
                NSLog(@"Background task to start a process ");
            }];
            //end completionHandler regarding to fetchCompletionHandler
            completionHandler(UIBackgroundFetchResultNewData);

            // doing my process...... and fire a local notification

            if(preLoadPNTask){
                NSLog(@"End Background task ");
                [[UIApplication sharedApplication] endBackgroundTask:preLoadPNTask];
                preLoadPNTask = 0;
            }
            return;
        }
        else
        {
            NSLog(@"didReceiveRemoteNotification it's NOT the silent notification ");
            completionHandler(UIBackgroundFetchResultNoData);
            return;
        }

    }
else {
    if(preLoadPNTask){
        NSLog(@"End Background task ");
        [[UIApplication sharedApplication] endBackgroundTask:preLoadPNTask];
        preLoadPNTask = 0;
    }
    completionHandler(UIBackgroundFetchResultNewData);
}

}

当设备连接到xcode时它完全正常，但是当它没有时，didReceiveRemoteNotification不会启动：（

有什么想法吗？

提前谢谢!!

Answer 1

我最终得到的是有线电视USB导致我出现一些问题，显然我每次插入iphone设备都说“这个配件可能不受支持”但是它继续正常工作，所以我换了一个新的，但这不能解决我的问题，但可以成为其中的一部分。所以我查看了代码，并且我做了一些更改，在收到2个更多的静默推送通知后，preLoadPNTask（UIBackgroundTaskIdentifier）创建了很多次，所以我在启动前添加了验证，

if(!preLoadPNTask){
//start a background task 
            UIBackgroundTaskIdentifier preLoadPNTask = [[UIApplication sharedApplication] beginBackgroundTaskWithExpirationHandler:^{
                NSLog(@"Background task to start a process ");
            }];

 }

我希望这对你有所帮助此致

Answer 2

在ios 8中，您需要执行以下步骤来触发didReceiveRemoteNotification：方法

选择项目目标转到功能选项卡
选择“背景模式”开启。
它会在您的项目info.plist

完成这些修改后，当您收到苹果推送通知并且应用程序已在后台时，则会触发didReceiveRemoteNotification。

Answer 3

可能是因为在iOS 8下你必须以不同的方式询问推送通知。试试这个：

-(void) registerForPushNotifications {

UIApplication* application=[UIApplication sharedApplication] ;

// Register for Push Notitications, if running iOS 8
if ([application respondsToSelector:@selector(registerUserNotificationSettings:)]) {
    UIUserNotificationType userNotificationTypes = (UIUserNotificationTypeAlert | UIUserNotificationTypeBadge | UIUserNotificationTypeSound);
    UIUserNotificationSettings *settings = [UIUserNotificationSettings settingsForTypes:userNotificationTypes categories:nil];
    [application registerUserNotificationSettings:settings];
    [application registerForRemoteNotifications];

} else {
    // Register for Push Notifications before iOS 8
    [application registerForRemoteNotificationTypes:(UIRemoteNotificationTypeBadge | UIRemoteNotificationTypeAlert | UIRemoteNotificationTypeSound)];
}

}

当应用程序未连接到xcode时，iOS 8静默推送通知不会触发didReceiveRemoteNotification方法

3 个答案: