如何識別哪個銷被挖掘

Question

我有一個應用程序MKMapView和大量的針腳在這張地圖上。

每個銷釘都得到了rightCalloutAccessoryView。我用這種方式創建它：

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

我應該怎麼知道，哪個針被點擊？ Thnx

Answer 1

在showDetails:方法中，您可以從地圖視圖的selectedAnnotations數組中獲取引腳。雖然屬性是一個NSArray，剛剛得到的數組中的第一個項目，因爲地圖視圖只允許一次選中一個針：與其做addTarget和實施

//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); 

順便說一句，一種自定義方法，可以使用地圖視圖的calloutAccessoryControlTapped委託方法。竊聽註釋在view參數可用：

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

務必從viewForAnnotation刪除addTarget如果使用calloutAccessoryControlTapped。