我有带有CLLocationCooperative2D
数组的mapView。我使用 MKPolyline
使用这些位置在我的 map View 上绘制线条。现在我想将其存储为 UIimage。我发现有类 MKMapSnapshotter
但不幸的是我无法在其上绘制叠加层“Snapshotter 对象不会捕获您的应用程序创建的任何叠加层或注释的视觉表示。”所以我只得到空白 map 图像。有什么方法可以用我的叠加层获取图像吗?
private func generateImageFromMap() {
let mapSnapshotterOptions = MKMapSnapshotter.Options()
guard let region = mapRegion() else { return }
mapSnapshotterOptions.region = region
mapSnapshotterOptions.size = CGSize(width: 200, height: 200)
mapSnapshotterOptions.showsBuildings = false
mapSnapshotterOptions.showsPointsOfInterest = false
let snapShotter = MKMapSnapshotter(options: mapSnapshotterOptions)
snapShotter.start() { snapshot, error in
guard let snapshot = snapshot else {
//do something with image ....
let mapImage = snapshot...
}
}
}
如何在此图像上添加叠加层?或者也许还有其他方法可以解决这个问题。
最佳答案
不幸的是,你必须自己画它们。幸运的是,MKSnapshot
有一个方便的 point(for:)
方法将 CLLocationCooperative2D
转换为快照内的 CGPoint
。
例如,假设您有一个 CLLocationCooperative2D
数组:
private var coordinates: [CLLocationCoordinate2D]?
private func generateImageFromMap() {
guard let region = mapRegion() else { return }
let options = MKMapSnapshotter.Options()
options.region = region
options.size = CGSize(width: 200, height: 200)
options.showsBuildings = false
options.showsPointsOfInterest = false
MKMapSnapshotter(options: options).start() { snapshot, error in
guard let snapshot = snapshot else { return }
let mapImage = snapshot.image
let finalImage = UIGraphicsImageRenderer(size: mapImage.size).image { _ in
// draw the map image
mapImage.draw(at: .zero)
// only bother with the following if we have a path with two or more coordinates
guard let coordinates = self.coordinates, coordinates.count > 1 else { return }
// convert the `[CLLocationCoordinate2D]` into a `[CGPoint]`
let points = coordinates.map { coordinate in
snapshot.point(for: coordinate)
}
// build a bezier path using that `[CGPoint]`
let path = UIBezierPath()
path.move(to: points[0])
for point in points.dropFirst() {
path.addLine(to: point)
}
// stroke it
path.lineWidth = 1
UIColor.blue.setStroke()
path.stroke()
}
// do something with finalImage
}
}
然后是以下 map View (坐标为 MKPolyline
,由 mapView(_:rendererFor:)
渲染,像往常一样):
上面的代码将创建这个finalImage
:
关于ios - 如何在 MKMapSnapshotter 上绘制 CLLocationCooperative2Ds(在 mapView 打印图像上绘制),我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/54678314/