objective-c - isRegisteredForRemoteNotifications 总是返回 no

Question

我收到了弹出窗口，我已经接受了，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

我认为它发生的原因可能是:

1. isRegisteredForRemoteNotifications 将始终返回 NO模拟器。
2. registerForRemoteNotifications 失败。