ios - 什么时候调用 didRegisterForRemoteNotificationsWithDeviceToken？

Question

有很多关于 didRegisterForRemoteNotificationsWithDeviceToken 的问题，但他们都回避了一个非常直接的问题，我似乎找不到确切的答案。

对于以所有其他方式正确设置通知并具有适当网络连接的应用程序:何时调用 didRegisterForRemoteNotificationsWithDeviceToken？一些可能的选择可能是:

1. 每次应用启动时
2. 仅在初始提示用户接受推送通知后
3. 还有别的吗？

Answer 1

在您的 UIApplication 中调用此方法后，应用程序委托(delegate)将在成功注册远程通知后调用该方法:

(void)registerForRemoteNotificationTypes:(UIRemoteNotificationType)types

根据:http://developer.apple.com/library/ios/#DOCUMENTATION/UIKit/Reference/UIApplication_Class/Reference/Reference.html

When you send this message, the device initiates the registration process with Apple Push Service. If it succeeds, the application delegate receives a device token in the application:didRegisterForRemoteNotificationsWithDeviceToken: method; if registration doesn’t succeed, the delegate is informed via the application:didFailToRegisterForRemoteNotificationsWithError: method. If the application delegate receives a device token, it should connect with its provider and pass it the token.

现在，进一步详细说明，通常情况下，应用程序会在应用程序委托(delegate)的 didFinishLaunchingWithOptions:(NSDictionary *)launchOptions 中调用 registerForRemoteNotificationTypes。因此，application:didRegisterForRemoteNotificationsWithDeviceToken 通常在应用程序启动后立即调用。

编辑: application:didRegisterForRemoteNotificationsWithDeviceToken 仍然会在第一次注册后被调用以进行后续注册。