Robovm：在IOS7&；上注册推送通知；损失8

我正在尝试使用我自己的简单绑定PushManager在robovm.0.0.14上注册推送通知，如下所示：

#import "PushManager.h"

@implementation PushManager

-(void) registerForPushNotifications
{

    NSLog(@"Registering for push notifications");
    if ([[UIApplication sharedApplication] respondsToSelector:@selector(registerUserNotificationSettings:)]) {
        NSLog(@"Registering for IOS 8 and later");
        [[UIApplication sharedApplication] registerUserNotificationSettings:[UIUserNotificationSettings settingsForTypes:(UIUserNotificationTypeSound | UIUserNotificationTypeAlert | UIUserNotificationTypeBadge) categories:nil]];
        [[UIApplication sharedApplication] registerForRemoteNotifications];
    } else {
        [[UIApplication sharedApplication] registerForRemoteNotificationTypes:
         (UIUserNotificationTypeBadge | UIUserNotificationTypeSound | UIUserNotificationTypeAlert)];
    }

}

@end

它正在IOS8设备上运行，但应用程序在类链接阶段在IOS 7设备上崩溃，如下所示：

dyld:未找到符号：_OBJC_CLASS_$\u UIUserNotificationSettings
引用自： /var/mobile/Applications/6C45E5E5-AF8F-43E8-9680-5CD3076DB1FF/Game.app/Game 预期位于：/System/Library/Frameworks/UIKit.framework/UIKit中 /var/mobile/Applications/6C45E5E5-AF8F-43E8-9680-5CD3076DB1FF/Game.app/Game

我知道iOS 8附带了

UIUserNotificationSettings

类，但我怎么能忽略iOS 7上绑定的PushManager类呢

---

对于这个iOS版本特定的问题，是否有任何解决方法或修复方法？

我检查是否存在类

UIUserNotificationSettings

，它是相关的，并且仅适用于iOS 8

NSClassFromString(@"UIUserNotificationSettings")

这有点间接，但对我有效