Issue
I am new in swift so I want to try this extension to crop an image but I dunno how to call it I already try call it with this code but I got unused notification and is that possible if I set the width and height with using an uiimageview ? thanks for all the answer really appreciate it
let size = CGSize(width: 500, height: 500)
previewKTPImage.image?.crop(to: size)
import UIKit
extension UIImage {
func crop(to:CGSize) -> UIImage {
guard let cgimage = self.cgImage else { return self }
let contextImage: UIImage = UIImage(cgImage: cgimage)
let contextSize: CGSize = contextImage.size
//Set to square
var posX: CGFloat = 0.0
var posY: CGFloat = 0.0
let cropAspect: CGFloat = to.width / to.height
var cropWidth: CGFloat = to.width
var cropHeight: CGFloat = to.height
if to.width > to.height { //Landscape
cropWidth = contextSize.width
cropHeight = contextSize.width / cropAspect
posY = (contextSize.height - cropHeight) / 2
} else if to.width < to.height { //Portrait
cropHeight = contextSize.height
cropWidth = contextSize.height * cropAspect
posX = (contextSize.width - cropWidth) / 2
} else { //Square
if contextSize.width >= contextSize.height { //Square on landscape (or square)
cropHeight = contextSize.height
cropWidth = contextSize.height * cropAspect
posX = (contextSize.width - cropWidth) / 2
}else{ //Square on portrait
cropWidth = contextSize.width
cropHeight = contextSize.width / cropAspect
posY = (contextSize.height - cropHeight) / 2
}
}
let rect: CGRect = CGRect(x : posX, y : posY, width : cropWidth, height : cropHeight)
// Create bitmap image from context using the rect
let imageRef: CGImage = contextImage.cgImage!.cropping(to: rect)!
// Create a new image based on the imageRef and rotate back to the original orientation
let cropped: UIImage = UIImage(cgImage: imageRef, scale: self.scale, orientation: self.imageOrientation)
cropped.draw(in: CGRect(x : 0, y : 0, width : to.width, height : to.height))
return cropped
}
}
Solution
You need to hold the return value
let result = previewKTPImage.image?.crop(to:CGSize(width: 500, height: 500))
previewKTPImage.image = result // note this will stretch it also so
configure contentMode
if needed
previewKTPImage.contentMode = .scaleAspectFit
Answered By - Sh_Khan Answer Checked By - Robin (PHPFixing Admin)
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