How do I add a text label on a polygon in Google Maps in iOS ? I tried to add an overlay but it will only accept images not text? I am using google maps for ios with Swift on iOS 9.
This is the portion of code troubling me :
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, 0, size.width, size.height))
var rect: CGRect = CGRectMake(24, 24, size.width, 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
}
Your UIGraphics
drawing method might not be correct, you can try the following code to make a new image from a text:
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, 0, size.width, 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.
}
}
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