单击地图注释时显示另一个视图 [英] show another view when map annotation are clicked

问题描述

我有一张只有一个注释的地图.我创建了一个简单的类，我希望它在用户单击注释时显示.问题是当我单击注释时什么也没有发生.

I have a map with only one annotation.I created a simple class which I want it to show when the user clicks on the annotation.The problem is that when I click on the annotation nothing happens.

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 新手，我可能会忘记一件简单的事情.谢谢

My showDetailView function never gets called.Please help me.I'm new to iphone and I might forget a simple thing.Thanks

还是不行！！！！

推荐答案

首先，检查地图视图的 delegate 是否设置，否则您的 viewForAnnotation 方法将不会被调用.

First, check that the map view's delegate is set otherwise your viewForAnnotation method will not get called.

接下来，附件按钮出现在注解的callout上，只有在你设置了canShowCallout时才会出现:

Next, the accessory button appears on the annotation's callout which will only appear if you set canShowCallout:

annView.canShowCallout = YES;

接下来，与其使用您自己的方法来处理按钮操作，不如使用地图视图自己的 calloutAccessoryControlTapped 委托方法，该方法在点击附件时会被调用:

Next, instead of using your own method to handle the button action, it's much better to use the map view's own calloutAccessoryControlTapped delegate method which gets called when tapping an accessory:

- (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 中删除 [detailButton addTarget... 行.

还要注意 showDetailView 方法中的 NSLog 缺少前导 @，这将导致调用该方法时崩溃.

Also note your NSLog in the showDetailView method is missing the leading @ which will result in a crash when the method does get called.

另一件事是你应该在 viewForAnnotation 中使用 dequeueReusableAnnotationViewWithIdentifier 来启用注释视图的重用.

Another thing is you should use dequeueReusableAnnotationViewWithIdentifier in viewForAnnotation to enable annotation view re-use.

要求的示例:

- (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];
}

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