ios7与ios8并存,注册推送通知

 // IOS8 新系统需要使用新的代码咯
    if ([[[UIDevice currentDevice] systemVersion] floatValue] >= 8.0)
    {
        [[UIApplication sharedApplication] registerUserNotificationSettings:[UIUserNotificationSettings
                                                                             settingsForTypes:(UIUserNotificationTypeSound |UIUserNotificationTypeAlert | UIUserNotificationTypeBadge)
                                                                             categories:nil]];

        [[UIApplication sharedApplication] registerForRemoteNotifications];
    }
    else
    {
        //ios7注册推送通知
        [[UIApplication sharedApplication] registerForRemoteNotificationTypes:
         (UIUserNotificationTypeBadge | UIUserNotificationTypeSound | UIUserNotificationTypeAlert)];
    }