ios - AVMakeRectWithAspectRatioInsideRect returning correct image but wrong size -

i new ios swift development newer manipulating images. have uiimageview inside of uiscrollview. want user zoom/pan show exact image want capture. have working extent. when user clicks button, capture image , in uiscrollview box, however, size of image not correct. appreciated!!

@ibaction func tapsendtoband(sender: uibutton) {       var frameinfo = frameforimage(photoimageview.image!, imageview: photoimageview)     var imagewidth = photoimageview.image!.size.height     var scale:cgfloat = cgfloat(1.0) / (photoimageview.frame.size.height / imagewidth)       var visiblerect = cgrect()     var pwidth  = cgfloat(cgimagegetwidth(photoimageview.image?.cgimage))     var pheight = cgfloat(cgimagegetheight(photoimageview.image?.cgimage))       visiblerect.origin = scrollview.contentoffset     visiblerect.size = scrollview.bounds.size     visiblerect.origin.x *= scale     visiblerect.origin.y *= scale     visiblerect.size.width *= scale     visiblerect.size.height *= scale      var psize:cgsize = cgsize(width: visiblerect.size.width,height: visiblerect.size.height)       let brect = avmakerectwithaspectratioinsiderect(psize, visiblerect)      uiimagewritetosavedphotosalbum(cropimage(photoimageview.image!, rect: brect), nil, nil, nil)      phototest.image = cropimage(photoimageview.image!, rect: brect)  } 

here frame function using try determine sizing

func frameforimage (image:uiimage, imageview:uiimageview) -> cgrect{          var imageratio = image.size.width / image.size.height;         var viewratio = imageview.frame.size.width / imageview.frame.size.height;          if(imageratio < viewratio){              var scale = imageview.frame.size.height / image.size.height;              var width = scale * image.size.width;              var topleftx = (imageview.frame.size.width - width) * 0.5;             return cgrectmake(topleftx, 0, width, imageview.frame.size.height)         }         else{             var scale = imageview.frame.size.width / image.size.width;             var height = scale * image.size.height;             var toplefty = (imageview.frame.size.height - height) * 0.5;              return cgrectmake(0, toplefty, imageview.frame.size.width, height);         }     } 

here function use crop image

func cropimage(srcimage:uiimage,rect:cgrect) -> uiimage {     var cgimageconv = srcimage.cgimage     var cgsizeconv:cgsize = cgsize(width: 310,height: 102)     var cr:cgimageref = cgimagecreatewithimageinrect(cgimageconv, rect)     var cropped:uiimage = uiimage(cgimage: cr)!      return cropped } 

the code below sets mode image view aspect ratio , fill area of screen.

//makes image view fill real estate have available on phones screen youruiimageview.autoresizingmask = uiviewautoresizing.flexiblebottommargin | uiviewautoresizing.flexibleheight | uiviewautoresizing.flexiblerightmargin | uiviewautoresizing.flexibleleftmargin | uiviewautoresizing.flexibletopmargin | uiviewautoresizing.flexiblewidth 

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//will make image view aspect ratio youruiimageview.contentmode = uiviewcontentmode.scaleaspectfit