苹果地图支持 zoom等级 以及 获取截图的方式

等级

extension MKMapView{
    var zoomLevel:Int{
        set{
            let span = MKCoordinateSpan.init(latitudeDelta: 0, longitudeDelta: 360 / pow(2, Double(newValue)) * Double(self.frame.size.width) / 256)
            self.setRegion(MKCoordinateRegion.init(center: self.centerCoordinate, span: span), animated: false)
        }
        
        get{
            let b = (Double(self.frame.size.width) / 256)
            let value = 360 / region.span.longitudeDelta/b
//            pow(2, Double(x)) = 360 / region.span.longitudeDelta/b 
            
            return Int(sqrt(value))
        }
    }
    //设置缩放级别时调用
    func setCenterCoordinate(coordinate: CLLocationCoordinate2D, zoomLevel: Int,
                             animated: Bool){
        let span = MKCoordinateSpan.init(latitudeDelta: 0, longitudeDelta: 360 / pow(2, Double(zoomLevel)) * Double(self.frame.size.width) / 256)
        
        setRegion(MKCoordinateRegion(center: centerCoordinate, span: span), animated: animated)
    }
}

地图截图

@IBAction func click1(_ sender: Any) {
        self.mapView.zoomLevel = 16
//        let option = MKMapSnapshotter.Options.init()
//        option.region = self.mapView.region
//        option.size = CGSize.init(width: 200, height: 200)
//        option.scale = UIScreen.main.scale
//        let snapShotter = MKMapSnapshotter.init(options: option)
//        snapShotter.start { (snapshot, error) in
//            if error == nil{
//                self.imgView = UIImageView.init(image: snapshot?.image)
//                self.imgView?.frame = CGRect.init(x: 100, y: 100, width: 200, height: 200)
//                self.imgView?.isUserInteractionEnabled = true
//                let tap = UITapGestureRecognizer.init(target: self, action: #selector(self.tapClick))
//                self.imgView?.addGestureRecognizer(tap)
//                self.view.addSubview(self.imgView!)
//            }
//        }
        
        
        
//        if let view = self.mapView.snapshotView(afterScreenUpdates: false) {
//
//            self.view.addSubview(view)
//        }
        
//        self.mapView.centerCoordinate
        
        let point = self.mapView.convert(self.mapView.centerCoordinate, toPointTo: self.mapView)
        var rect = CGRect.init(x: 0, y: 0, width: 200, height: 200)
        rect.origin.x = point.x - rect.size.width/2
        rect.origin.y = point.y - rect.size.height/2
        if let view = self.mapView.resizableSnapshotView(from: rect, afterScreenUpdates: true, withCapInsets: UIEdgeInsets.zero) {
            
//            self.view.addSubview(view)
            let img = view.snapshot()
            
            self.imgView = UIImageView.init(image: img)
            self.imgView?.frame = CGRect.init(x: 100, y: 100, width: 200, height: 200)
//            self.imgView?.backgroundColor = .red
            self.imgView?.isUserInteractionEnabled = true
            let tap = UITapGestureRecognizer.init(target: self, action: #selector(self.tapClick))
            self.imgView?.addGestureRecognizer(tap)
            self.view.addSubview(self.imgView!)
        }
    }

extension UIView{
    //将当前视图转为UIImage
    func asImage() -> UIImage {
        let renderer = UIGraphicsImageRenderer(bounds: bounds)
        return renderer.image { rendererContext in
            layer.render(in: rendererContext.cgContext)
        }
    }
    public func snapshot(rect: CGRect = CGRect.zero, scale: CGFloat = UIScreen.main.scale) -> UIImage? {
        var snapRect = rect
        if __CGSizeEqualToSize(rect.size, CGSize.zero) {
            snapRect = calculateSnapshotRect()
        }
        UIGraphicsBeginImageContextWithOptions(snapRect.size, false, scale)
        defer {
            UIGraphicsEndImageContext()
        }
        let siF = self.drawHierarchy(in: snapRect, afterScreenUpdates: false)
        if !siF {
            self.drawHierarchy(in: snapRect, afterScreenUpdates: true)
        }
        
        print("siF == \(siF)")
        return UIGraphicsGetImageFromCurrentImageContext()
    }
    // 计算UIView所显示内容Rect
    func calculateSnapshotRect() -> CGRect {
        var targetRect = self.bounds
        if let scrollView = self as? UIScrollView {
            let contentInset = scrollView.contentInset
            let contentSize = scrollView.contentSize
            
            targetRect.origin.x = contentInset.left
            targetRect.origin.y = contentInset.top
            targetRect.size.width = targetRect.size.width  - contentInset.left - contentInset.right > contentSize.width ? targetRect.size.width  - contentInset.left - contentInset.right : contentSize.width
            targetRect.size.height = targetRect.size.height - contentInset.top - contentInset.bottom > contentSize.height ? targetRect.size.height  - contentInset.top - contentInset.bottom : contentSize.height
        }
        return targetRect
    }
}