ios - How to insert labels on top of images saved to .WriteToFile in PNG's Swift -

i'm trying save label on top of image using .writetofile .

here's code i'm using save image :

    let selectedimage: uiimage = image.image!      let filemanager = nsfilemanager.defaultmanager()      let paths = nssearchpathfordirectoriesindomains(.documentdirectory, .userdomainmask, true)[0] string      let filepathtowrite = "\(paths)/user_profile_image.png"      let imagedata: nsdata = uiimagepngrepresentation(selectedimage)!      let jpgimagedata = uiimagejpegrepresentation(selectedimage, 1.0)      filemanager.createfileatpath(filepathtowrite, contents: jpgimagedata, attributes: nil)      // check file saved               let getimagepath = (paths nsstring).stringbyappendingpathcomponent("user_profile_image.png")      if (filemanager.fileexistsatpath(getimagepath)) {      print("file available");   } else {      print("file not available");  } 

but saves image :

i'm trying retrieve :

 if let pdfurl = nsbundle.mainbundle().urlforresource("user_profile_image", withextension: "png", subdirectory: nil, localization: nil),data = nsdata(contentsofurl: pdfurl), baseurl = pdfurl.urlbydeletinglastpathcomponent  {        let webview = uiwebview(frame: cgrectmake(20,20,self.view.frame.size.width-40,self.view.frame.size.height-40))     print("hello world")     webview.loaddata(data, mimetype: "application/pdf", textencodingname:"", baseurl: baseurl)//application/     self.view.addsubview(webview)   } 

but isn't working. ideas?

in current approach, placing uilabel on top of image, not modify image in anyway, label sits on it. write text on image need use graphics context draw text on image.

have @ below code, take image , write hello world in white text in bottom right corner.

class viewcontroller: uiviewcontroller {      @iboutlet weak var imageview: uiimageview!      override func viewdidload() {         super.viewdidload()         // additional setup after loading view, typically nib.       }      override func viewdidappear(animated: bool) {         super.viewdidappear(animated)          let font = uifont.boldsystemfontofsize(30)         let showtext:nsstring = "hello world"         // setting attr: font name, color...etc.         let attr = [nsfontattributename: font, nsforegroundcolorattributename:uicolor.whitecolor()]         // getting size         let sizeoftext = showtext.sizewithattributes(attr)          let image = uiimage(named: "dog")         let rect = cgrectmake(0, 0, image!.size.width, image!.size.height)          uigraphicsbeginimagecontextwithoptions(cgsize(width: rect.size.width, height: rect.size.height), true, 0)          // drawing our image graphics context         image?.drawinrect(rect)         // drawing text         showtext.drawinrect(cgrectmake(rect.size.width-sizeoftext.width-10, rect.size.height-sizeoftext.height-10, rect.size.width, rect.size.height), withattributes: attr)          // getting image         let newimage = uigraphicsgetimagefromcurrentimagecontext();         uigraphicsendimagecontext()          self.imageview.image = newimage     } } 

once have done this, can save newimage file, or overwrite existing one.

i used bottom of guide reference, it's while since done this