如何识别敲击了哪个引脚 [英] How to recognize which pin was tapped

问题描述

我的应用程序带有 MKMapView 以及此地图上的大量针脚。

I got an app with MKMapView and large number of pins on this map.

每个针脚都有 rightCalloutAccessoryView 。我以这种方式创建它：

Every pin got rightCalloutAccessoryView. I create it in this way:

UIButton* rightButton = [UIButton buttonWithType:UIButtonTypeDetailDisclosure];
[rightButton addTarget:self action:@selector(showDetails:) forControlEvents:UIControlEventTouchUpInside];
pinView.rightCalloutAccessoryView = rightButton;

我怎么知道，哪个引脚被点击了？ Thnx

How should i know, which pin was tapped? Thnx

推荐答案

在 showDetails：方法中，你可以获得pin从地图视图的 selectedAnnotations 数组中点击。即使该属性是 NSArray ，也只是获取数组中的第一项，因为地图视图一次只允许选择一个引脚：

In the showDetails: method, you can get the pin tapped from the map view's selectedAnnotations array. Even though the property is an NSArray, just get the first item in the array since the map view only allows one pin to be selected at a time:

//To be safe, may want to check that array has at least one item first.

id<MKAnnotation> ann = [[mapView selectedAnnotations] objectAtIndex:0];

// OR if you have custom annotation class with other properties...
// (in this case may also want to check class of object first)

YourAnnotationClass *ann = [[mapView selectedAnnotations] objectAtIndex:0];

NSLog(@"ann.title = %@", ann.title);

顺便说一句，而不是做 addTarget 并实现自定义方法，您可以使用地图视图的 calloutAccessoryControlTapped 委托方法。点击的注释可在视图参数中找到：

By the way, instead of doing addTarget and implementing a custom method, you can use the map view's calloutAccessoryControlTapped delegate method. The annotation tapped is available in the view parameter:

-(void)mapView:(MKMapView *)mapView annotationView:(MKAnnotationView *)view 
    calloutAccessoryControlTapped:(UIControl *)control
{
    NSLog(@"ann.title = %@", view.annotation.title);
}

确保删除 addTarget 来自 viewForAnnotation 如果您使用 calloutAccessoryControlTapped 。

Make sure you remove the addTarget from viewForAnnotation if you use calloutAccessoryControlTapped.

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