Mapbox selectAnnotation在ViewDidLoad中不起作用，或在ViewDidAppear中首次使用

Question

I have a master-detail application, and my details page is a map. When I click on the element in the Master list, the map with whole bunch of markers shows up, zooms/pans into a specific location, and an annotation pops up describing what this location is.

The implementation is pretty simple, so I thought. In my viewDidAppear, I go through the list of annotations in my mapview and just call [mapView selectAnnotation: myAnnotation animated: FALSE] and it works fine. BUT NOT THE FIRST TIME!

I populate my map in ViewDidLoad, and the first time the ViewDidAppear is called, the mapView.annotations array is still empty. Is there a simple way to make it work even when I first enter the details view? Or do I have to create and populate the map in the AppDelegate?

Answer 1

Try using MGLMapViewDelegate and especially

func mapViewDidFinishLoadingMap(mapView: MGLMapView) {

// your code here

}

Answer 2

也许您可以在DetailViewController上定义一个方法，然后在触发诸如tableview的didselect或prepareForSegue之类的方法时，您必须获取DetailViewController的实例，最后，可以使用此实例调用用户定义的方法。