ios - Cropping image with Swift and put it on center position -

in swift programming , how crop image , put on center afterwards?

this i've got far ... i've crop image want put on center after

    imgview.image = origimage     var masklayer = cashapelayer()     masklayer.frame = imgview.frame     masklayer.path = path.cgpath     masklayer.fillcolor = uicolor.whitecolor().cgcolor     masklayer.backgroundcolor = uicolor.clearcolor().cgcolor      imgview.layer.mask = masklayer       uigraphicsbeginimagecontext(imgview.bounds.size);        imgview.layer.renderincontext(uigraphicsgetcurrentcontext())        var image = uigraphicsgetimagefromcurrentimagecontext()        imgview.image = image     uigraphicsendimagecontext(); 

update :

     let rect: cgrect = cgrectmake(path.bounds.minx, path.bounds.miny, path.bounds.width, path.bounds.height)      // create bitmap image context using rect     let imageref: cgimageref = cgimagecreatewithimageinrect(image.cgimage, rect)     imgview.bounds = rect     imgview.image = uiimage(cgimage: imageref) 

i able center getting path.bound , size , change bounds of imageview. :)

to centered position crop, can halve difference of height , width. can assign bounds new width , height after checking orientation of image (which part longer)

func croptobounds(image: uiimage, width: double, height: double) -> uiimage {      let contextimage: uiimage = uiimage(cgimage: image.cgimage)!      let contextsize: cgsize = contextimage.size      var posx: cgfloat = 0.0     var posy: cgfloat = 0.0     var cgwidth: cgfloat = cgfloat(width)     var cgheight: cgfloat = cgfloat(height)      // see size longer , create center off of     if contextsize.width > contextsize.height {         posx = ((contextsize.width - contextsize.height) / 2)         posy = 0         cgwidth = contextsize.height         cgheight = contextsize.height     } else {         posx = 0         posy = ((contextsize.height - contextsize.width) / 2)         cgwidth = contextsize.width         cgheight = contextsize.width     }      let rect: cgrect = cgrectmake(posx, posy, cgwidth, cgheight)      // create bitmap image context using rect     let imageref: cgimageref = cgimagecreatewithimageinrect(contextimage.cgimage, rect)      // create new image based on imageref , rotate original orientation     let image: uiimage = uiimage(cgimage: imageref, scale: image.scale, orientation: image.imageorientation)!      return image } 

i found of info on @ website in case wanted read further.