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)];
    }