isRegisteredForRemoteNotifications始终返回no

Question

我得到了弹出窗口,我接受了,我在通知中看到它并且它已打开但是这段代码总是返回否,我似乎无法找出原因

UIApplication *application = [UIApplication sharedApplication];

BOOL enabled;

// Try to use the newer isRegisteredForRemoteNotifications otherwise use the enabledRemoteNotificationTypes.
if ([application respondsToSelector:@selector(isRegisteredForRemoteNotifications)])
{

    enabled = [application isRegisteredForRemoteNotifications];
}
else
{
    UIRemoteNotificationType types = [application enabledRemoteNotificationTypes];
    enabled = types & UIRemoteNotificationTypeAlert;

}
if  (enabled){
    NSLog(@"is registered");
}else{
     NSLog(@"is not registered");
}

Answer 1

我认为它的实现可能是:

1. isRegisteredForRemoteNotifications将始终在模拟器中返回NO.
2. registerForRemoteNotifications失败.

Answer 2

我正在努力解决同样的问题，这对我有用。

BOOL enabled = NO;
UIUserNotificationSettings *notificationSettings = [SharedApplication currentUserNotificationSettings];
enabled = notificationSettings.types < 4;