我刚开始在 iOS 中开发。很抱歉，如果问题似乎微不足道：
我通过 SwiftyJSON 从 API 加载几个标记/注释，并将它们显示在 Mapbox MapView 上。单击注释时会触发标注。- 这工作得很好，很容易。问题：我想将 mapView 放在标记/注释和标注的中心，或者移动相机以将它们显示在中心，放大。每当我使用这样的东西时：
let camera = MGLMapCamera(lookingAtCenterCoordinate: annotation.coordinate, fromDistance: 1000, pitch: 0, heading: 0)
mapView.setCamera(camera, withDuration: 2, animationTimingFunction: CAMediaTimingFunction(name: kCAMediaTimingFunctionEaseInEaseOut))
或者
mapView.setCenterCoordinate(annotation.coordinate, zoomLevel: 15, animated: true)
标注只是保持在相同的位置。我想要实现的是，它显示在注释/标记的顶部。
这是我这部分的完整代码（不包括在 viewdidload 中构建注释：
func mapView(mapView: MGLMapView, imageForAnnotation annotation: MGLAnnotation) -> MGLAnnotationImage? {
var annotationImage = mapView.dequeueReusableAnnotationImageWithIdentifier("marker_live")
if annotationImage == nil {
// Leaning Tower of Pisa by Stefan Spieler from the Noun Project
var image = UIImage(named: "marker_live")!
image = image.imageWithAlignmentRectInsets(UIEdgeInsetsMake(0, 0, image.size.height/2, 0))
annotationImage = MGLAnnotationImage(image: image, reuseIdentifier: "marker_live")
}
return annotationImage
}
func mapView(mapView: MGLMapView, annotationCanShowCallout annotation: MGLAnnotation) -> Bool {
print("tap on annotation")
mapView.selectAnnotation(annotation, animated: true)
return true
}
func mapView(mapView: MGLMapView, calloutViewForAnnotation annotation: MGLAnnotation) -> UIView? {
return CustomCalloutView(representedObject: annotation)
}
func mapView(mapView: MGLMapView, tapOnCalloutForAnnotation annotation: MGLAnnotation) {
print("Tapped the callout for: \(annotation.title!)")
self.performSegueWithIdentifier("PlaylistFromMap", sender: annotation.title!)
mapView.deselectAnnotation(annotation, animated: true)
}
我也想过使用完成处理程序，但不明白它是如何工作的。非常感谢帮助！