在 registerUserNotificationSettings 之后立即调用 registerForRemoteNotifications？

Question

根据 apple 的 guide，它建议以这种方式注册通知：

- (void)applicationDidFinishLaunching:(UIApplication *)app {
   // other setup tasks here....

   // Register the supported interaction types.
    UIUserNotificationType types = UIUserNotificationTypeBadge |
                 UIUserNotificationTypeSound | UIUserNotificationTypeAlert;
    UIUserNotificationSettings *mySettings =
                [UIUserNotificationSettings settingsForTypes:types categories:nil];
    [[UIApplication sharedApplication] registerUserNotificationSettings:mySettings];

   // Register for remote notifications.
    [[UIApplication sharedApplication] registerForRemoteNotifications];
}

如上图，在registerUserNotificationSettings后立即调用registerForRemoteNotifications，但是第一次打开应用时，获取不到成功访问令牌，因为用户尚未授予通知权限。

这样，应用程序第二次打开时，将获得访问令牌。

苹果为什么这么建议？

我建议在didRegisterUserNotificationSettings中调用registerForRemoteNotifications，因为它会在用户授予通知权限后调用。

   func application(application: UIApplication, didRegisterUserNotificationSettings notificationSettings: UIUserNotificationSettings){


       application.registerForRemoteNotifications()

    }

我的建议正确吗？

Answer 1

您的建议是正确的。你可能总是想要 post 一个 NSNotification 是你想在你的视图控制器中处理失败。

- (void)application:(UIApplication *)application didRegisterUserNotificationSettings:(UIUserNotificationSettings *)notificationSettings
{
if (notificationSettings.types != UIUserNotificationTypeNone) {
    //register to receive notifications
    [application registerForRemoteNotifications];
} else {
    // same as response to didFailToRegisterForRemoteNotificationsWithError
    NSDictionary* data = [NSDictionary dictionaryWithObject:@"" forKey:@"deviceToken"];
    [[NSNotificationCenter defaultCenter] postNotificationName:@"notificationsRegistered" object:self userInfo:data];
}    
}

Answer 2

您还应该检查通知错误的条件。

 func application(application: UIApplication, didRegisterForRemoteNotificationsWithDeviceToken deviceToken: NSData) {
    print("Got token data! \(deviceToken)")
}

func application(application: UIApplication, didFailToRegisterForRemoteNotificationsWithError error: NSError) {
    print("Couldn't register: \(error)")
}

如果您想检查通知设置，请使用此方法：

func application(application: UIApplication, didRegisterUserNotificationSettings notificationSettings: UIUserNotificationSettings){

}

在 registerUserNotificationSettings 之后立即调用 registerForRemoteNotifications？

calling registerForRemoteNotifications immediately after registerUserNotificationSettings?

ios

ios8

push-notification

apple-push-notifications

ios9