在这种情况下 mapView:viewForAnnotation: 会被调用吗

In which case that mapView:viewForAnnotation: will be called?(在这种情况下 mapView:viewForAnnotation: 会被调用吗?)

问题描述

现在我想在我的 iOS 应用中的地图上添加静态图钉注释.

Now I want to add a static pin annotation on map in my iOS app.

但我只想知道是否会调用委托方法 mapView:viewForAnnotation:.

But I just want to know if the delegate method mapView:viewForAnnotation: will be called.

在Apple文档中，据说

In the Apple documentation, it is said that

 When it needs an annotation view, the map view calls the mapView:viewForAnnotation:    method of its delegate object. 

我已经阅读了一些来自 Internet 的教程和来自 Apple 的官方文档.而且我仍然不知道何时调用此方法.

I have read several tutorials from Internet and official documentation from Apple. And I still don't when this method will be called.

推荐答案

每当你调用 addAnnotation 方法 - (MKAnnotationView *)mapView:(MKMapView *)mapView viewForAnnotation:(id <MKAnnotation >)annotation 被调用.看看截图吧.

Whenever you call addAnnotation method - (MKAnnotationView *)mapView:(MKMapView *)mapView viewForAnnotation:(id < MKAnnotation >)annotation gets called. Have look at the screenshot.

您可以在 MKMapView 类参考

You can find this on MKMapView Class Reference

附:在 addAnnotation 调用和 - (MKAnnotationView *)mapView:(MKMapView *)mapView viewForAnnotation:(id < MKAnnotation >)annotation 处放置断点，您将看到函数的流程轻松调用.

P.S. Put breakpoints at addAnnotation call and - (MKAnnotationView *)mapView:(MKMapView *)mapView viewForAnnotation:(id < MKAnnotation >)annotation you will see the flow of function call easily.

这篇关于在这种情况下 mapView:viewForAnnotation: 会被调用吗?的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持编程学习网！