override func application(application: UIApplication,didReceiveRemoteNotification userInfo: [NSObject : AnyObject],fetchCompletionHandler completionHandler: (UIBackgroundFetchResult) -> Void) {
println("hey)
}
如果我覆盖
override func application(application: UIApplication,didReceiveRemoteNotification userInfo: [NSObject : AnyObject]) {
println("hey")
}
在前台发送通知应用程序时,我没有收到任何方法的调用.为什么第一个工作,但第二个没有应用程序在前台？
请注意,我只是一次执行其中之一.不是同时两个.
解决方法
Implement the
application:didReceiveRemoteNotification:fetchCompletionHandler:method instead of this one whenever possible. If your delegate implements both methods,the app object calls theapplication:didReceiveRemoteNotification:fetchCompletionHandler:method.
旧版本还将根据应用程序是否有效(前景或背景)或从冷启动启动而提供不同的结果.在后一种情况下,它不会被调用,您将需要截取didOfficeLaunchingWithOptions的launchOptions dict来获取infoDict：
If the app is not running when a remote notification arrives,the method launches the app and provides the appropriate information in the launch options dictionary. The app does not call this method to handle that remote notification.
使用回调版本.适用于所有情况.您不必使用完成处理程序/块,在这种情况下,效果是相同的(更符合较新的方法).
更新
对不起,苹果说你必须尽快打电话给完成块“ – 在操作系统放弃你之前你有30秒钟的时间.这可能是您的警告的根源.
As soon as you finish processing the notification,you must call the block in the handler parameter or your app will be terminated. Your app has up to 30 seconds of wall-clock time to process the notification and call the specified completion handler block. In practice,you should call the handler block as soon as you are done processing the notification.
所以调用完成块：
completionHandler(UIBackgroundFetchResult.NoData)
我一直在使用这种方法,而不用调用那个完成块,没有遇到任何问题,但是我现在只需要加一个来安全.苹果建议,如果你不这样做,你的应用程序将不会出现,但实际上我没有看到.
