可触摸图像作为注释标注？

Question

我尝试使用BarButton，但这是错误的：

CGSize thumbSize = CGSizeMake(30.0, 30.0);
UIImageView *annotationThumbnail = [[UIImageView alloc] initWithImage:[((Sight *)annotation).thumbnail imageToFitSize:thumbSize method:MGImageResizeScale]];
UIBarButtonItem *annotationButton = [[UIBarButtonItem alloc] initWithCustomView:annotationThumbnail];

annotationView.leftCalloutAccessoryView = annotationButton;

Answer 1

UIBarButtonItem不是UIView的子类，因此在需要视图的地方使用UIBarButtonItem的实例是行不通的。相反，您可以像这样使用annotationThumbnail：

annotationView.leftCalloutAccessoryView = annotationThumbnail;

如果您改为使用UIControl子类，例如UIButton，如果有人点击了标注附件，地图的委托将收到-mapView:annotationView:calloutAccessoryControlTapped:消息：

UIButton *button = [UIButton buttonWithType:UIButtonTypeRoundedRect];
[button setBackgroundImage:someImage forState:UIControlStateNormal];
button.frame = someRect;
annotationView.leftCalloutAccessoryView = button;