如何检测地图视图上显示的注释标注? [英] how to detect a callout of an annotation is showing on mapview?

问题描述

我有一个与签到相关的应用程序.当用户点击地图上的一个地点时，标注将弹出并显示其名称和地址.同时，如果场地距离当前位置1000m以内，会显示签到按钮.

I have a checkin related app. When user clicks a venue on map, callout will popup and show its name and address. At the same time, if the venue is within 1000m from current location, a check in button will be displayed.

去一个可以签到的场地，我想要的就是，

To a venue that can checkin, all I want is,

当标注弹出时，签入按钮显示.当标注消失时，该按钮也会消失.

when callout is popup, check in button shows. when callout is disappear, that button disappears too.

现在显示按钮效果很好，但我不知道如何检测标注可见状态.有没有callout show/hide的回调方法?

Now show button works well, but I don't know how to detect callout visible status. Is there any callback method that callout show/hide?

提前致谢！

推荐答案

标注被选中时出现 - 您可以在委托中使用 mapView:didSelectAnnotationView: 方法来跟踪该事件.取消选择注释时标注隐藏 - 使用 mapView:didDeselectAnnotationView: 方法跟踪该事件.

Callout appears when annotation is selected - you can use mapView:didSelectAnnotationView: method in delegate to track that event. Callout hides when annotation is deselected - use mapView:didDeselectAnnotationView: method to track that event.

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