Question

My Annotations像这样放在地图上：

for (i = 0; i < [results count]; i++) {
        // create new object CustomAnnotation
        myAnn = [[CustomAnnotation alloc] init];
        // set the lat and long of the object
        location.latitude = (double)[[[results objectAtIndex:i] objectForKey:@"lat"] doubleValue];
        location.longitude = (double)[[[results objectAtIndex:i] objectForKey:@"long"] doubleValue];
        // set properties of the object
        myAnn.coordinate = location;
        myAnn.title = [[results objectAtIndex:i] objectForKey:@"title"];
        myAnn.subtitle = [[results objectAtIndex:i] objectForKey:@"strap"];
        myAnn.pinId = [[results objectAtIndex:i] objectForKey:@"id"];
        myAnn.url = [[results objectAtIndex:i] objectForKey:@"link"];
        myAnn.dateTime = [[results objectAtIndex:i] objectForKey:@"timestamp"];

        // add the object to the array locations
        [locations addObject:myAnn];
    }

在calloutAccessoryTapped的方法中，我试图获取myAnn.url值，以便我可以在Safari中打开它。执行此操作的方法：

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

但是我无法访问很糟糕的view.annotation.url。有没有办法获得myAnn的url值？ myAnn是一个对象CustomAnnotation（定义了@property url之类的东西），它有：

@interface CustomAnnotation : NSObject <MKAnnotation>

我希望view.annotation.url会被继承，但再看一遍，我没有访问CustomAnnotation。

所以我的问题是，当点击详细信息披露按钮时，我可以获得注释的网址吗？

Answer 1

易：

- (void)mapView:(MKMapView *)mapView annotationView:(MKAnnotationView *)view calloutAccessoryControlTapped:(UIControl *)control {
    CustomAnnotation *annotation = (CustomAnnotation *)view.annotation;
    NSURL *selectedURL = annotation.url;
}

自定义注释属性来存储来自数据库的URL（继承问题？）

1 个答案: