Question

我在O'Reilly教程中看到了以下警告：

http://answers.oreilly.com/index.php?app=core&module=attach&section=attach&attach_rel_module=post&attach_id=125
http://answers.oreilly.com/uploads/monthly_10_2009/post-48-125435525931_thumb.jpg

我不明白如何触发这些警报。请你告诉我的意见？该应用程序使用ios6

Answer 1

这是访问当前位置时的提醒，当您使用CLLocationManager

访问用户当前位置时会自动询问

-(void)getLocation
{
    locationManager = [[CLLocationManager alloc] init];
    locationManager.delegate = self;
    locationManager.distanceFilter = kCLLocationAccuracyHundredMeters;
    locationManager.desiredAccuracy = kCLLocationAccuracyBest;

    NSLog(@"eee%f",locationManager.location.coordinate.latitude);
    // Start updating location changes.
    [locationManager startUpdatingLocation];
}


- (void)startUpdatingCurrentLocation
{
    //NSLog(@"STARTUPDATELOCATION");
    // if location services are restricted do nothing
    if ([CLLocationManager authorizationStatus] == kCLAuthorizationStatusDenied ||
        [CLLocationManager authorizationStatus] == kCLAuthorizationStatusRestricted )
    {
        return;
    }

    // if locationManager does not currently exist, create it
    if (!locationManager)
    {
        locationManager = [[CLLocationManager alloc] init];
        [locationManager setDelegate:self];
        locationManager.distanceFilter = 10.0f; // we don't need to be any more accurate than 10m


    }

    [locationManager startUpdatingLocation];

    // [self showCurrentLocationSpinner:YES];
}

请阅读CLLocationManager Class Reference了解详情

Answer 2

好吧，它非常简单。它被称为UIAlertView并且非常常见，用于发出通知。它们应该用于通知用户某些东西而不是用于交互。

明智的编码，这是一些基本的设置文本：

UIAlertView *alert = [[UIAlertView alloc] initWithTitle:@"Alert" message:@"Alert Body" delegate:self cancelButtonTitle:@"Dismiss" otherButtonTitles:nil, nil];

显示提醒：

[alert show];

如果您想要其他按钮标题，则需要将delegate设置为self，并将.h文件符合UIAlertViewDelegate。 Here Is The Reference To The Delegate并且您基本上希望实现clickedButtonAtIndex:方法并使用索引来找出用户按下哪个按钮并执行操作。

Do not misuse alert views.

核心位置警报

2 个答案: