swift - Cropping a captured still image -


i want specific part of captured image cropped in circular shape right before it's viewed.

here code capturing still images:

@ibaction func takephoto(sender: uibutton) {      self.stillimageoutput!.capturestillimageasynchronouslyfromconnection(self.stillimageoutput!.connectionwithmediatype(avmediatypevideo)) { (buffer:cmsamplebuffer!, error:nserror!) -> void in         var image = avcapturestillimageoutput.jpegstillimagensdatarepresentation(buffer)         var data_image = uiimage(data: image)         self.previewimage.image = data_image      }  }

thank you

if let imagedata = avcapturestillimageoutput.jpegstillimagensdatarepresentation(buffer) {     if let image = uiimage(data: imagedata) {         let square = image.size.width < image.size.height ? cgsize(width: image.size.width, height: image.size.width) : cgsize(width: image.size.height, height: image.size.height)         let imageview = uiimageview(frame: cgrect(origin: cgpoint(x: 0, y: 0), size: square))         imageview.contentmode = uiviewcontentmode.scaleaspectfill         imageview.image = image         imageview.layer.cornerradius = square.width/2         imageview.layer.maskstobounds = true         uigraphicsbeginimagecontext(imageview.bounds.size)         imageview.layer.renderincontext(uigraphicsgetcurrentcontext())         let result = uigraphicsgetimagefromcurrentimagecontext()         uigraphicsendimagecontext()         self.previewimage.image = result     } }

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