Question 68906 in IOS Swift Question posted in
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How to resize and reshape UIImage without causing any distortion? – Ios swift

I am using the clearbit api to get and display company logos in my app. This works great except that all of the logos are different size, and I want them all to be displayed as a square.

Does anybody know how to take a rectangular image and add extra pixels to it of a given color until it becomes square with the logo at the center?

This question seemed to answer it, but it is outdated. I also thought that the top answer on this question would work, but the code didn’t work. Any help would be very much appreciated, thank you!

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2

Answers


  1. 0

    1. ` func drawImageOnCanvas(_ useImage: UIImage, canvasColor: UIColor ) -> UIImage {

      let length = max(useImage.size.width, useImage.size.height)
let canvasSize = CGSize.init(width: length, height: length)
let rect = CGRect(origin: .zero, size: canvasSize)
UIGraphicsBeginImageContextWithOptions(rect.size, false, 0.0)

// fill the entire image
canvasColor.setFill()
UIRectFill(rect)

// calculate a Rect the size of the image to draw, centered in the canvas rect
let centeredImageRect = CGRect(x: (canvasSize.width - useImage.size.width) / 2,
                               y: (canvasSize.height - useImage.size.height) / 2,
                               width: useImage.size.width,
                               height: useImage.size.height)

// get a drawing context
let context = UIGraphicsGetCurrentContext();

// "cut" a transparent rectanlge in the middle of the "canvas" image
context?.clear(centeredImageRect)

// draw the image into that rect
useImage.draw(in: centeredImageRect)

// get the new "image in the center of a canvas image"
let image = UIGraphicsGetImageFromCurrentImageContext()
UIGraphicsEndImageContext()

return image!

      }`

    2. ` func imageWithColor(color : UIColor,oriImage:UIImage) -> UIImage{

      let length = max(oriImage.size.width, oriImage.size.height)
let size = CGSize.init(width: length, height: length)
let imgView = UIImageView.init(image: oriImage)
imgView.contentMode = UIView.ContentMode.scaleAspectFit
imgView.backgroundColor = color
imgView.bounds = CGRect.init(x: 0, y: 0, width: length, height: length)
print("(size.width)" + "(size.height)")

UIGraphicsBeginImageContext(size)
guard let context = UIGraphicsGetCurrentContext() else{
    print("context get Error")
    return oriImage
}
imgView.layer.render(in:context)
let desImg = UIGraphicsGetImageFromCurrentImageContext()
UIGraphicsEndImageContext()

return desImg ?? oriImage

      }`

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  2. 0 
    import UIKit

extension UIImage {
    func scalePreservingAspectRatio(targetSize: CGSize) -> UIImage {
        // Determine the scale factor that preserves aspect ratio
        let widthRatio = targetSize.width / size.width
        let heightRatio = targetSize.height / size.height
        
        let scaleFactor = min(widthRatio, heightRatio)
        
        // Compute the new image size that preserves aspect ratio
        let scaledImageSize = CGSize(
            width: size.width * scaleFactor,
            height: size.height * scaleFactor
        )

        // Draw and return the resized UIImage
        let renderer = UIGraphicsImageRenderer(
            size: scaledImageSize
        )

        let scaledImage = renderer.image { _ in
            self.draw(in: CGRect(
                origin: .zero, 
                size: scaledImageSize
            ))
        }
        
        return scaledImage
    }
}
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