Ios 使用未声明的标识符'；UIUserNotificationSettings'；

我正在尝试使用Xcode 6编译现有的应用程序

这是我的代码：

UIUserNotificationSettings *settings = [UIApplication.sharedApplication currentUserNotificationSettings];

这是我的错误：

use of undeclared identifier 'UIUserNotificationSettings'

我不知道如何解决这个问题

这是我对iOS 8的检查：

if (SYSTEM_VERSION_LESS_THAN(_iOS_8_0)) {

        // Displaying notifications and ringing

        if ([self isMissingMandatoryNotificationTypes:[UIApplication.sharedApplication enabledRemoteNotificationTypes]]) {

            [self registrationWithSuccess:^{
                DDLogInfo(@"Push notifications were succesfully re-enabled");
            } failure:^{
                [self.missingPermissionsAlertView show];
            }];
        }

    } else {

        // UIUserNotificationsSettings
        UIUserNotificationSettings *settings = [UIApplication.sharedApplication currentUserNotificationSettings];

这样做：

#if __IPHONE_OS_VERSION_MIN_REQUIRED >= 80000

UIUserNotificationSettings *settings = [UIApplication.sharedApplication currentUserNotificationSettings];

#endif

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你的应用程序是否适用于iOS8？你是否更改了部署目标？太好了！这正是我所需要的。对我来说，使用xcode 5.1.1和版本为8.1.1的iphone都不起作用