发送者时提取MKAnnotation标注的标题

Question

好的,所以我有一个带注释的地图视图,当点击时,它们会在右侧显示带有泄露图标的标注.点击时,会调用此函数:

- (void)showDetails:(id)sender
{
    NSLog(@"showDetails: called!");
    NSLog(@"sender: %@",sender);
    PermitDetailViewController *permitDetail = [[PermitDetailViewController alloc] initWithStyle:UITableViewStyleGrouped];
    NSLog(@"permitDetail.title: %@",permitDetail.title);
    permitDetail.title = sender.title; //compiler doesn't like this!
    NSLog(@"permitDetail.title: %@",permitDetail.title);
    [self.navigationController pushViewController:permitDetail animated:YES];
    [permitDetail release];
}

到目前为止一切顺利,但我需要知道标注的标题是什么.我正在尝试发送sender.title,但这样做不好......有什么想法吗？

当我将有问题的行更改为时,这是控制台输出permitDetail.title = self.title;:

2010-12-02 11:50:06.044 Parking[55413:207] showDetails: called!
2010-12-02 11:50:06.045 Parking[55413:207] sender: <UIButton: 0x8139890; frame = (104 8; 29 31); opaque = NO; autoresize = LM; layer = <CALayer: 0x8139920>>
2010-12-02 11:50:06.045 Parking[55413:207] permitDetail.title: (null)
2010-12-02 11:50:06.045 Parking[55413:207] permitDetail.title: All Permits

Answer 1

您的案例中的发件人是标注按钮(不是MKAnnotation),因此它没有title属性.

在viewForAnnotation中,删除公开按钮上的addTarget.只需将注释视图的rightCalloutAccessoryView设置为按钮即可.

然后实现calloutAccessoryControlTapped委托方法,该方法将在调用标注时调用.它还提供对调用中的注释视图的引用.注释视图包含对注释的引用:

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

    //do your show details thing here...
}