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HTML5 发布时间：2022-04-27 发布网站：大佬教程 code.js-code.com

大佬教程收集整理的这篇文章主要介绍了为iOS swift的谷歌地图中的多边形添加文本标签，大佬教程大佬觉得挺不错的，现在分享给大家，也给大家做个参考。

如何在iOS中的Google地图中的多边形上添加文本标签？我试图添加叠加但它只接受图像而不是文字？我在iOS 9上使用谷歌地图为ios与 Swift.

这是困扰我的代码部分：

func updateUIMap(){

            var str = "Hello"
            var data = str.dataUsingEncoding(NSUTF8StringEncoding,allowLossyConversion: truE)
            var drawText = NSString(data: data!,encoding: NSUTF8StringEncoding)
            let size = CGSize(width: 24.0,height: 24.0)

           var inImage = UIImage()
            var textColor: UIColor = UIColor.blackColor()
            var textFont: UIFont = UIFont(name: "Helvetica Bold",size: 12)!
            UIGraphicsBeginImageContext(sizE)
            let textFontAttributes = [
                NSFontAttributename: textFont,NSForegroundColorAttributename: textColor,]

            inImage.drawInRect(CGRectMake(0,size.width,size.height))

            var rect: CGRect = CGRectMake(24,24,size.height)

            drawText.drawInRect(rect,withAttributes: textFontAttributes)

            var newImage: UIImage = UIGraphicsGetImageFromCurrentImageContext()


            UIGraphicsEndImageContext()

            var overlay = GMSGroundOverlay(position: myposition,icon: newImage,zoomLevel:20)
            overlay.bearing = 0
            overlay.map = self.mapView
}

解决方法

您的UIGraphics绘图方法可能不正确,您可以尝试以下代码从文本中创建新图像：

class ViewController: UIViewController {

    override func viewDidLoad() {
        super.viewDidLoad()

        super.viewDidLoad()

        let camera = GMSCameraPosition.cameraWithLatitude(40.712216,longitude: -74.22655,zoom: 10)
        let mapView = GMsmapView.mapWithFrame(CGRectZero,camera: camera)
        mapView.myLOCATIOnEnabled = true
        self.view = mapView

        addGroundOverlay(camera.target)
    }

    func newImage(text: String,size: CGSizE) -> UIImage {

        let data = text.dataUsingEncoding(NSUTF8StringEncoding,allowLossyConversion: truE)
        let drawText = NSString(data: data!,encoding: NSUTF8StringEncoding)

        let textFontAttributes = [
            NSFontAttributename: UIFont(name: "Helvetica Bold",size: 20)!,NSForegroundColorAttributename: UIColor.redColor(),]

        UIGraphicsBeginImageContextWithOptions(size,false,0)
        drawText?.drawInRect(CGRectMake(0,size.height),withAttributes: textFontAttributes)
        let newImage = UIGraphicsGetImageFromCurrentImageContext()
        UIGraphicsEndImageContext()

        return newImage
    }

    func addGroundOverlay(position: CLLOCATIOnCoordinate2D) {

        let overlay = GMSGroundOverlay(position: position,icon: newImage("Hello StackOverflow",size: CGSizeMake(150.0,150.0)),zoomLevel: 10)
        overlay.bearing = 0
        overlay.map = (self.view as! GMsmapView)
    }

    override func didReceiveMemoryWarning() {
        super.didReceiveMemoryWarning()
        // Dispose of any resources that can be recreated.
    }

}