我试图用MKMapSnapshotter的startWithCompletionHandler方法获取地图视图的快照.我想将自定义图钉注释视图添加到快照.并且我的自定义注释视图中有一个标签.所以当我正在拍摄快照时,我无法显示该标签.
这是代码：
这是代码：
let snapshotter = MKMapSnapshotter(options: options)
snapshotter.startWithCompletionHandler() {
snapshot,error in
if error != nil {
completion(image: nil,error: error)
return
}
let image = snapshot.image
let pin = MKPinAnnotationView(annotation: nil,reuseIdentifier: "") // I want to use custom annotation view instead of MKPinAnnotationView
let pinImage = UIImage(named: "pinImage")
UIGraphicsBeginImageContextWithOptions(image.size,true,image.scale);
image.drawAtPoint(CGPointMake(0,0))
var homePoint = snapshot.pointForCoordinate(coordinates[0])
pinImage!.drawAtPoint(homePoint)
pinImage!.drawAtPoint(snapshot.pointForCoordinate(coordinates[1]))
let finalImage = UIGraphicsGetImageFromCurrentImageContext()
UIGraphicsEndImageContext()
completion(image: finalImage,error: nil)
}
正如你所看到的,drawAtPoint是UIImage的功能.我尝试使用UIImageView然后我将标签添加到imageView作为subView但我不能使用drawView与imageView,所以我的问题是我无法添加标签到mapView快照.
你可以在链接上看到我的意思：
https://www.dropbox.com/s/83hnkiqi87uy5ab/map.png?dl=0
谢谢你的建议.
解决方法
创建自定义AnnotationView类.当您创建MKMapSnapshotter时,使用坐标和标题定义MKPointAnnotation.之后,从Custom Class定义annotationView.您可以使用MKPointAnnotation初始化自定义annotationView.并使用drawViewHierarchyInRect方法而不是drawAtPoint.
你的代码必须是这样的.
let snapshotter = MKMapSnapshotter(options: options)
snapshotter.startWithCompletionHandler() {
snapshot,error: error)
return
}
let image = snapshot.image
var annotation = MKPointAnnotation()
annotation.coordinate = coordinates[0]
annotation.title = "Your Title"
let annotationView = CustomAnnotationView(annotation: annotation,reuseIdentifier: "annotation")
let pinImage = annotationView.image
UIGraphicsBeginImageContextWithOptions(image.size,image.scale);
image.drawAtPoint(CGPointMake(0,0)) //map
// pinImage!.drawAtPoint(snapshot.pointForCoordinate(coordinates[0]))
annotationView.drawViewHierarchyInRect(CGRectMake(snapshot.pointForCoordinate(coordinates[0]).x,snapshot.pointForCoordinate(coordinates[0]).y,annotationView.frame.size.width,annotationView.frame.size.height),afterScreenUpdates: true)
let finalImage = UIGraphicsGetImageFromCurrentImageContext()
UIGraphicsEndImageContext()
completion(image: finalImage,error: nil)
}
