简体繁体 English

如何检测注释的标注正在mapview上显示？

[英]how to detect a callout of an annotation is showing on mapview?

原文 2011-03-24 13:13:49 2 2 iphone/ annotations/ mkmapview

I have a checkin related app. 我有一个签入相关的应用程序。 When user clicks a venue on map, callout will popup and show its name and address. 当用户点击地图上的场地时，将弹出标注并显示其名称和地址。 At the same time, if the venue is within 1000m from current location, a check in button will be displayed. 同时，如果场地距离当前位置1000米以内，将显示一个登记入住按钮。

To a venue that can checkin, all I want is, 对于可以登记的场所，我想要的只是，

when callout is popup, check in button shows. 当弹出标注时，检查按钮显示。 when callout is disappear, that button disappears too. 当标注消失时，该按钮也会消失。

Now show button works well, but I don't know how to detect callout visible status. 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。 Is there any callback method that callout show/hide? 是否有任何callout show / hide的回调方法？

Thanks in advance! 提前致谢！

2 个解决方案

Callout appears when annotation is selected - you can use mapView:didSelectAnnotationView: method in delegate to track that event. 选择注释时会显示标注 - 您可以在委托中使用mapView:didSelectAnnotationView:方法来跟踪该事件。 Callout hides when annotation is deselected - use mapView:didDeselectAnnotationView: method to track that event. 取消选择注释时，Callout会隐藏 - 使用mapView:didDeselectAnnotationView:方法来跟踪该事件。

As you can see here it is about selected property of MKAnnotationView, which is saying that If the property contains YES, the annotation view is displaying a callout bubble. 正如你在这里看到的那样，它是关于MKAnnotationView的选定属性，它说如果属性包含YES，则注释视图显示一个标注气泡。

You may additionally implement an observer for this property, to implement your functionality. 您还可以为此属性实现一个观察者，以实现您的功能。