Apple在9月18日正式发布了iOS8,在收到更新的同时,也发现自己的应用在iOS8下无法启动。
并且在Console中收到如下提示:

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2014-09-19 16:26:20.369 demo[379:30506] registerForRemoteNotificationTypes: is not supported in iOS 8.0 and later.

查询文档可以知道,在iOS8中注册推送的方法

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![Alt text](/upload/ios8-registerForRemoteNotificationTypes.png)

按照文档中的提示,使用```registerForRemoteNotifications```方法代替,这个方法不接受参数。紧接着问题就来了,**程序在安装过这个应用的iOS8机器上可以成功注册,而在新安装的iOS8机器上则无法注册**,```application:didRegisterForRemoteNotificationsWithDeviceToken:```和```application:didFailToRegisterForRemoteNotificationsWithError:```都无法响应,并且在成功注册的机器上,收到的推送消息也没有声音提示。再次查看文档后发现这么一段话:

If you want your app’s push notifications to display alerts, play sounds, or perform other user-facing actions, you must call the registerUserNotificationSettings: method to request the types of notifications you want to use.

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换句话说,如果要使用推送服务,还需要再调用```registerUserNotificationSettings```方法,而这个方法是和iOS7上的```registerForRemoteNotificationTypes```方法一样接受参数的。为什么iOS8下要把一个方法变成两个方法呢?```registerForRemoteNotifications```方法的文档中有这么一句话:

Call this method to initiate the registration process with Apple Push Service. If registration succeeds, the app calls your app delegate object’s application:didRegisterForRemoteNotificationsWithDeviceToken: method and passes it a device token.

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苹果可能考虑到一些应用注册提醒可能只是为了获取deviceToken,所以将获取deviceToken单独提成一个方法,而要接收推送还需要单独调用别的方法,这样就细化了逻辑,方便不用的开发需求。不过在真机调试中,一台刚重置过的搭载iOS8系统的iPhone5c,调用registerForRemoteNotifications方法后,并没有收到任何失败或成功的回调,和Apple文档中描述的不符,怀疑是SDK在这部分也有bug。

下面贴一下兼容iOS7和iOS8的注册推送代码:

#define IS_OS_8_OR_LATER ([[[UIDevice currentDevice] systemVersion] floatValue] >= 8.0)
if (IS_OS_8_OR_LATER) {
[[UIApplication sharedApplication] registerForRemoteNotifications];
UIUserNotificationSettings *settings = [UIUserNotificationSettings settingsForTypes: (UIRemoteNotificationTypeBadge | UIRemoteNotificationTypeAlert | UIRemoteNotificationTypeSound) categories:nil];
[[UIApplication sharedApplication] registerUserNotificationSettings:settings];
} else {
[application registerForRemoteNotificationTypes:
UIRemoteNotificationTypeBadge |
UIRemoteNotificationTypeAlert |
UIRemoteNotificationTypeSound];
}
`