单击地图注释时显示另一个视图

Question

我有一个只有一个注释的地图。我创建了一个简单的类，我希望它在用户点击注释时显示。问题是当我点击注释时没有任何反应。

这是我的代码：

- (void)reverseGeocoder:(MKReverseGeocoder *)geocoder didFindPlacemark:(MKPlacemark *)placemark{
    NSLog(@"Reverse Geocoder completed");
    mPlacemark=placemark;
    [mapView addAnnotation:placemark];
}

- (MKAnnotationView *) mapView:(MKMapView *)mapView viewForAnnotation:(id <MKAnnotation>) annotation{
    MKPinAnnotationView *annView=[[MKPinAnnotationView alloc] initWithAnnotation:annotation reuseIdentifier:@"currentloc"];
    annView.animatesDrop=TRUE;

    //create UIButton for annotation
    UIButton *detailButton = [UIButton buttonWithType:UIButtonTypeDetailDisclosure];
    //NSInteger annotationValue = [self.annotations indexOfObject:annotation];

    [detailButton addTarget:self action:@selector(showDetailView:) forControlEvents:UIControlEventTouchUpInside];
    annView.rightCalloutAccessoryView=detailButton;
    return annView;
}


-(void)showDetailView:(id)sender{
    NSLog("inside the stupid method");
    MyDetailViewController *detailView=[[MyDetailViewController alloc] initWithNibName:@"MyDetailViewController" bundle:nil];
    [[self navigationController] pushViewController:detailView animated:YES];
    [detailView release];
}

我的showDetailView函数永远不会被调用。请帮助我。我是iphone的新手，我可能会忘记一件简单的事情。谢谢

还是行不通！！！！

Answer 1

首先，检查是否设置了地图视图的delegate ，否则将不会调用viewForAnnotation方法。

接下来，附件按钮出现在注释的标注上 ，只有在设置了canShowCallout才会出现：

annView.canShowCallout = YES;

接下来，使用地图视图自己的calloutAccessoryControlTapped委托方法，而不是使用自己的方法来处理按钮操作，这种方法在点击附件时会被调用：

- (void)mapView:(MKMapView *)mapView annotationView:(MKAnnotationView *)view calloutAccessoryControlTapped:(UIControl *)control
{
    NSLog(@"inside the stupid method");

    //Here, the annotation tapped can be accessed using view.annotation
}

从viewForAnnotation删除[detailButton addTarget...行。

另请注意，showDetailView方法中的NSLog缺少前导@ ，这会在调用方法时导致崩溃。

另一件事是你应该在viewForAnnotation使用dequeueReusableAnnotationViewWithIdentifier来重新使用注释视图。

请求示例 ：

- (MKAnnotationView *) mapView:(MKMapView *)mapView viewForAnnotation:(id <MKAnnotation>) annotation
{
    static NSString *annReuseId = @"currentloc";

    MKPinAnnotationView *annView = (MKPinAnnotationView *)[mapView dequeueReusableAnnotationViewWithIdentifier:annReuseId];
    if (annView == nil)
    {
        annView = [[MKPinAnnotationView alloc] initWithAnnotation:annotation reuseIdentifier:annReuseId];

        annView.animatesDrop = YES;
        annView.canShowCallout = YES;

        UIButton *detailButton = [UIButton buttonWithType:UIButtonTypeDetailDisclosure];
        annView.rightCalloutAccessoryView=detailButton;
    }
    else {
        annView.annotation = annotation;
    }

    return annView;
}

- (void)mapView:(MKMapView *)mapView annotationView:(MKAnnotationView *)view calloutAccessoryControlTapped:(UIControl *)control
{
    NSLog(@"calloutAccessoryControlTapped: annotation = %@", view.annotation);
    MyDetailViewController *detailView=[[MyDetailViewController alloc] initWithNibName:@"MyDetailViewController" bundle:nil];
    //here, can set annotation info in some property of detailView
    [[self navigationController] pushViewController:detailView animated:YES];
    [detailView release];
}

Answer 2

好。 如果您使用的是故事板，则需要在地图视图控制器之间创建一个segue，然后在下面的代码所在的位置创建一个segue：

- (void)mapView:(MKMapView *)mapView annotationView:(MKAnnotationView *)view calloutAccessoryControlTapped:(UIControl *)control
{
    NSLog(@"calloutAccessoryControlTapped: annotation = %@", view.annotation);
    MyDetailViewController *detailView=[[MyDetailViewController alloc] initWithNibName:@"MyDetailViewController" bundle:nil];
    //here, can set annotation info in some property of detailView
    [[self navigationController] pushViewController:detailView animated:YES];
    [detailView release];
}

请改用以下代码：

NSLog(@"calloutAccessoryControlTapped: annotation = %@", view.annotation);
[self performSegueWithIdentifier:@"DetailViewController" sender:self];

这将为您提供详细视图的移动。

Answer 3

像这样编写你的函数：

-(IBAction)showDetailView:(id)sender{
    NSLog("inside the stupid method");
    MyDetailViewController *detailView=[[MyDetailViewController alloc] initWithNibName:@"MyDetailViewController" bundle:nil];
    [[self navigationController] pushViewController:detailView animated:YES];
    [detailView release];
}

Answer 4

替换-(IBAction)showDetailView:(UIView*)sender具有以下内容......

    -(void)showDetailView:(id)sender

Answer 5

你必须像这样设置地图委托给自己，

mapview.delegate=self; （如果你在同一页面调用方法）

如果您没有在代码中分配代理，则不会调用相应的方法，因此请检查您是否具有上述行。