ios8下推送的注册方式（同时兼容ios8以下版本）

今天刚升级到ios8系统，原项目编译发现异常信息：

registerForRemoteNotificationTypes: is not supported in iOS 8.0 and later.

于是查了资料，原来是注册方式改变了，蛋疼的苹果！

解决方法如下，同时对ios8以下版本进行处理：

if ([application respondsToSelector:@selector(isRegisteredForRemoteNotifications)]) {

   // iOS 8 推送注册

   [application registerUserNotificationSettings:

   [UIUserNotificationSettingssettingsForTypes:

      (UIUserNotificationTypeSound

      |UIUserNotificationTypeAlert

      |UIUserNotificationTypeBadge)

      categories:nil]];

   [application registerForRemoteNotifications];

} else {

   // iOS 8 以下版本推送注册

   [application registerForRemoteNotificationTypes:

      (UIRemoteNotificationTypeBadge

      |UIRemoteNotificationTypeAlert

      |UIRemoteNotificationTypeSound)];

}