使用UIAlertViewStylePlainTextInput编辑注释文本 [英] Edit annotation text with an UIAlertViewStylePlainTextInput

问题描述

我可以将图钉注释放到具有公开按钮的地图上.单击该按钮时，会弹出一个alertView，在其中可以删除所选的注释.我现在尝试使用UIAlertViewStylePlainTextInput编辑选定的注释字幕.关于如何执行此操作的任何想法?

- (void)mapView:(MKMapView *)mapView annotationView:(MKAnnotationView *)view calloutAccessoryControlTapped:(UIControl *)control
{
    NSLog(@"Annotation button clicked");
    UIAlertView * alert = [[UIAlertView alloc] initWithTitle:@"Annotation" message:@"Edit Subtitle" delegate:self cancelButtonTitle:@"Hide" otherButtonTitles:@"Update Subtitle", @"Remove Pin",nil];
    alert.alertViewStyle = UIAlertViewStylePlainTextInput;
    [alert show];
}

- (void)alertView:(UIAlertView *)alertView clickedButtonAtIndex:(NSInteger)buttonIndex{
    if (buttonIndex == 0) {
        NSLog(@"Hide button clicked");
    }
    if (buttonIndex == 1) {
        NSLog(@"Update button clicked");
        //e.g. subtitle.text = [[alertView textFieldAtIndex:0] text];
    }
    if (buttonIndex == 2) {
        NSLog(@"Remove button clicked");
        [self.map removeAnnotations:self.map.selectedAnnotations];
    }
}

解决方案

就像删除注释一样，您可以使用地图视图的selectedAnnotations属性来访问所选注释以更新其subtitle.

以下示例假定您对注释使用注释类MKPointAnnotation(具有可设置的subtitle属性)，但可以根据需要将其替换为您的类:

NSLog(@"Update button clicked");

//e.g. subtitle.text = [[alertView textFieldAtIndex:0] text];

//Make sure there is a selected annotation...
if (self.map.selectedAnnotations.count > 0)
{
    //Since only one annotation can be selected at a time,
    //the selected annotation is the one at index 0...
    id<MKAnnotation> ann = [self.map.selectedAnnotations objectAtIndex:0];

    //Make sure the selected annotation is one of our types...
    if ([ann isKindOfClass:[MKPointAnnotation class]])
    {
        MKPointAnnotation *pa = (MKPointAnnotation *)ann;
        pa.subtitle = [[alertView textFieldAtIndex:0] text];
    }
}

I can drop pin annotations onto a map which has a disclosure button. When that button is clicked an alertView pops up in which I can remove the selected annotation. I am now trying the edit the selected annotation subtitle with UIAlertViewStylePlainTextInput. Any ideas on how I can do this?

- (void)mapView:(MKMapView *)mapView annotationView:(MKAnnotationView *)view calloutAccessoryControlTapped:(UIControl *)control
{
    NSLog(@"Annotation button clicked");
    UIAlertView * alert = [[UIAlertView alloc] initWithTitle:@"Annotation" message:@"Edit Subtitle" delegate:self cancelButtonTitle:@"Hide" otherButtonTitles:@"Update Subtitle", @"Remove Pin",nil];
    alert.alertViewStyle = UIAlertViewStylePlainTextInput;
    [alert show];
}

- (void)alertView:(UIAlertView *)alertView clickedButtonAtIndex:(NSInteger)buttonIndex{
    if (buttonIndex == 0) {
        NSLog(@"Hide button clicked");
    }
    if (buttonIndex == 1) {
        NSLog(@"Update button clicked");
        //e.g. subtitle.text = [[alertView textFieldAtIndex:0] text];
    }
    if (buttonIndex == 2) {
        NSLog(@"Remove button clicked");
        [self.map removeAnnotations:self.map.selectedAnnotations];
    }
}

解决方案

Just like when removing the annotation, you can use the map view's selectedAnnotations property to get access to the selected annotation to update its subtitle.

The following example assumes you're using the annotation class MKPointAnnotation (which has a settable subtitle property) for your annotations but you can replace it with your class as needed:

NSLog(@"Update button clicked");

//e.g. subtitle.text = [[alertView textFieldAtIndex:0] text];

//Make sure there is a selected annotation...
if (self.map.selectedAnnotations.count > 0)
{
    //Since only one annotation can be selected at a time,
    //the selected annotation is the one at index 0...
    id<MKAnnotation> ann = [self.map.selectedAnnotations objectAtIndex:0];

    //Make sure the selected annotation is one of our types...
    if ([ann isKindOfClass:[MKPointAnnotation class]])
    {
        MKPointAnnotation *pa = (MKPointAnnotation *)ann;
        pa.subtitle = [[alertView textFieldAtIndex:0] text];
    }
}

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