如何通過發件人獲取注釋參考？

Question

我將注釋與UITapGestureRecognizer連接。 我想檢測觸摸。

    if ([annotation isKindOfClass:[Annotation class]])
 {
     NSString * annotationIdentifier = @"UserAnnotationIdentifier";
     CustomAnnotationView * customAnnotationView = (CustomAnnotationView *)[mapView dequeueReusableAnnotationViewWithIdentifier:annotationIdentifier];
     if (!customAnnotationView)
     {
         customAnnotationView = [[CustomAnnotationView alloc]initWithAnnotation:annotation reuseIdentifier:annotationIdentifier];
         UITapGestureRecognizer *tapGesture =
         [[UITapGestureRecognizer alloc] initWithTarget:self
                                                 action:@selector(calloutTapped:)];
         [customAnnotationView addGestureRecognizer:tapGesture];

我使用代碼底部，但在編譯時導致錯誤

  -(void) calloutTapped:(id) sender {
       id<MKAnnotation> annotation = ((MKAnnotationView*)sender.view).annotation;

錯誤：在類型為__strong id的對象上找不到屬性視圖

Answer 1

更改：

-(void) calloutTapped:(id) sender

至：

-(void) calloutTapped:(UITapGestureRecognizer *) sender

那么sender將具有view屬性， 或者首先將sender為UITapGestureRecognizer 。
正確投放：

 -(void) calloutTapped:(id) sender {
    UITapGestureRecognizer *tapGesture = (UITapGestureRecognizer *)sender;
    MKAnnotationView *sendersView = (MKAnnotationView *)tapGesture.view;
    id<MKAnnotation> annotation = sendersView.annotation;
}