ios - [[UIApplication sharedApplication] currentUserNotificationSettings].types 的调用总是返回 UIUserNotificationTypeNone

Question

我需要检查用户是否在“设置”中启用了推送通知。为此，我使用此代码:

    if ([[UIApplication sharedApplication] isRegisteredForRemoteNotifications] == NO) {
        NSLog(@"NO");
        // NO
    }
    if ([[UIApplication sharedApplication]respondsToSelector:@selector(currentUserNotificationSettings)]){
        UIUserNotificationSettings *noticationSettings =     [[UIApplication sharedApplication] currentUserNotificationSettings];
        if (!noticationSettings || (noticationSettings.types ==   UIUserNotificationTypeNone)) {
            NSLog(@"NO");
            // here it does not work, I enabled push notifications
            // in settings and noticationSettings.types returns UIUserNotificationTypeNone
            // NO
        } else {
            NSLog(@"YES");
            // YES
        }
    }

但问题是 notificationSettings.types 总是返回 UIUserNotificationTypeNone，无论是否在“设置”中启用推送通知。

如图所示，我启用了推送通知，但 notificationSettings.types 返回了 UIUserNotificationTypeNone，有人能告诉我问题出在哪里吗？谢谢

Answer 1

您的屏幕截图表明您没有使用 UIUserNotificationTypeBadge 或 UIUserNotificationTypeSound 或 UIUserNotificationTypeAlert 调用 registerUserNotificationSettings。

尝试以下操作:

UIUserNotificationSettings *settings = [UIUserNotificationSettings settingsForTypes:(UIUserNotificationTypeBadge
                                                                                     |UIUserNotificationTypeSound
                                                                                     |UIUserNotificationTypeAlert) categories:nil];

UIApplication *application = [UIApplication sharedApplication];
[application registerUserNotificationSettings:settings];