UIUserNotificationSettings类型返回错误的值

Question

我的情况如下：

1. 安装我的应用
2. 转到设备的应用设置并关闭我的应用的推送通知。
3. 删除我的应用

4. 重新安装我的应用并以编程方式获取推送通知设置，如下所示：

   if ([[UIApplication sharedApplication]respondsToSelector:@selector(currentUserNotificationSettings)]){
           UIUserNotificationSettings *noticationSettings =     [[UIApplication sharedApplication] currentUserNotificationSettings];
              if (!noticationSettings || (noticationSettings.types ==   UIUserNotificationTypeNone)) {
                return NO;
          }
       return YES;
   }
   

但是，notificationSettings.types始终返回UIUserNotificationTypeNone，但在设备的应用设置中，通知设置正在启用。 在这种情况下，有人可以帮助我获得正确的通知设置值吗？

Answer 1

你应该检查

[[UIApplication sharedApplication] isRegisteredForRemoteNotifications]

致电前

[[UIApplication sharedApplication] currentUserNotificationSettings];

这是正确的代码：

    if ([[UIApplication sharedApplication] isRegisteredForRemoteNotifications] == NO)
        return NO;
if ([[UIApplication sharedApplication]respondsToSelector:@selector(currentUserNotificationSettings)]){
        UIUserNotificationSettings *noticationSettings =     [[UIApplication sharedApplication] currentUserNotificationSettings];
           if (!noticationSettings || (noticationSettings.types ==   UIUserNotificationTypeNone)) {
             return NO;
       }
    return YES;
}

Answer 2

似乎在打电话 [[UIApplication sharedApplication] currentUserNotificationSettings] 在打电话之前 [[UIApplication sharedApplication] registerUserNotificationSettings:]返回错误的值。