ios - 请求用户允许在触发本地通知时显示警报

Question

我想在触发本地通知时显示警报，但为此我必须请求许可，正如我在 iPhone 上运行该应用程序时对我说的那样:

Attempting to schedule a local notification {fire date = Friday 13 June 2014 12 h 10 min 27 s Central European Summer Time, time zone = (null), repeat interval = 0, repeat count = UILocalNotificationInfiniteRepeatCount, next fire date = Friday 13 June 2014 12 h 10 min 27 s Central European Summer Time, user info = (null)} with an alert but haven't received permission from the user to display alerts

我该怎么做？这是现在的代码:

    UILocalNotification *localNotif = [[UILocalNotification alloc] init];
    localNotif.fireDate = [[NSDate date] dateByAddingTimeInterval:timeUntilNotification];
    localNotif.soundName = UILocalNotificationDefaultSoundName;
    localNotif.alertBody = @"ZEIT!";
    localNotif.alertAction = @"Show me the Timer!";
    localNotif.applicationIconBadgeNumber = [[UIApplication sharedApplication] applicationIconBadgeNumber] +1;


    [[UIApplication sharedApplication] scheduleLocalNotification:localNotif];

Answer 1

添加这段代码，它会显示一个警告 View 来请求用户的许可。

if ([UIApplication instancesRespondToSelector:@selector(registerUserNotificationSettings:)]) {
    [[UIApplication sharedApplication] registerUserNotificationSettings:[UIUserNotificationSettings settingsForTypes:UIUserNotificationTypeAlert|UIUserNotificationTypeSound|UIUserNotificationTypeBadge
                                                                                                          categories:nil]];
}

你可以在application:didFinishLaunchingWithOptions中添加这段代码；方法，以便应用程序会在用户启动应用程序时询问您的用户，或者您可以在设置本地通知时添加此代码，这取决于您。