ios - overlaying text on image using swift -

i trying overlay text on image using swift , looking @ code here: (src: how add text image in ios swift)

this places text right in center. have been changing values in

 var rect = cgrectmake(10,150, inimage.size.width,        inimage.size.height) 

but unable text show in lower left corner. can , show missing here ?

i adding modified image using line:

modimage = self.texttoimage("000", inimage: uiimage(named:"thisimage.png")!, atpoint: cgpointmake(10, 400)) 

below function...

func texttoimage(drawtext: nsstring, inimage: uiimage, atpoint: cgpoint) -> uiimage{      // setup font specific variables     var textcolor = uicolor.whitecolor()     var textfont = uifont(name: "helvetica bold", size: 12)!      // setup image context using passed image     let scale = uiscreen.mainscreen().scale     uigraphicsbeginimagecontextwithoptions(inimage.size, false, scale)      // setup font attributes later used dictate how text should drawn     let textfontattributes = [         nsfontattributename: textfont,         nsforegroundcolorattributename: textcolor,     ]      // put image rectangle large original image     inimage.drawinrect(cgrectmake(0, 0, inimage.size.width, inimage.size.height))      // create point within space bit image     var rect = cgrectmake(atpoint.x, atpoint.y, inimage.size.width, inimage.size.height)      // draw text image     drawtext.drawinrect(rect, withattributes: textfontattributes)      // create new image out of images have created     var newimage = uigraphicsgetimagefromcurrentimagecontext()      // end context have image need     uigraphicsendimagecontext()      //pass image caller     return newimage  } 

details

xcode 8.2.1, swift 3

code

viewcontroller.swift

class viewcontroller: uiviewcontroller {      let imageview = uiimageview(frame: cgrect(x: 50, y: 50, width: 300, height: 300))      override func viewdidload() {         super.viewdidload()         // additional setup after loading view, typically nib.         let image =  uiimage(named: "wall")!.addtext("swift", atpoint: cgpoint(x: 20, y: 320), textcolor:nil, textfont:uifont.systemfont(ofsize: 40))         imageview.image = image          view.addsubview(imageview)      } } 

uiimage.swift

    import uikit  extension uiimage {      func addtext(_ drawtext: nsstring, atpoint: cgpoint, textcolor: uicolor?, textfont: uifont?) -> uiimage {          // setup font specific variables         var _textcolor: uicolor         if textcolor == nil {             _textcolor = uicolor.white         } else {             _textcolor = textcolor!         }          var _textfont: uifont         if textfont == nil {             _textfont = uifont.systemfont(ofsize: 16)         } else {             _textfont = textfont!         }          // setup image context using passed image         uigraphicsbeginimagecontext(size)          // setup font attributes later used dictate how text should drawn         let textfontattributes = [             nsfontattributename: _textfont,             nsforegroundcolorattributename: _textcolor,             ] [string : any]          // put image rectangle large original image         draw(in: cgrect(x: 0, y: 0, width: size.width, height: size.height))          // create point within space bit image         let rect = cgrect(x: atpoint.x, y: atpoint.y, width: size.width, height: size.height)          // draw text image         drawtext.draw(in: rect, withattributes: textfontattributes)          // create new image out of images have created         let newimage = uigraphicsgetimagefromcurrentimagecontext()          // end context have image need         uigraphicsendimagecontext()          //pass image caller         return newimage!      }  } 

result

about memory leaks (use extension in loop)

// test memory leaks dispatchqueue.global(qos: .background).async { [weak self] in     index in 0...2000 {         print(index)         autoreleasepool { () -> () in             let image = self?.imageview.image!.addtext("swift", atpoint: cgpoint(x: 20, y: 320), textcolor:nil, textfont:uifont.systemfont(ofsize: 40))             self?.imageview.image = image         }     } } 

source image