How to adjust an UIButton's imageSize?

Question

How can I adjust the image size of the UIButton? I am setting the image like this:

[myLikesButton setImage:[UIImage imageNamed:@\"icon-heart.png\"] forState:UICo         


        

Answer 1

One approach is to resize the UIImage in code like the following. Note: this code only scales by height, but you can easily adjust the function to scale by width as well.

let targetHeight = CGFloat(28)
let newImage = resizeImage(image: UIImage(named: "Image.png")!, targetHeight: targetHeight)
button.setImage(newImage, for: .normal)

fileprivate func resizeImage(image: UIImage, targetHeight: CGFloat) -> UIImage {
    // Get current image size
    let size = image.size

    // Compute scaled, new size
    let heightRatio = targetHeight / size.height
    let newSize = CGSize(width: size.width * heightRatio, height: size.height * heightRatio)
    let rect = CGRect(x: 0, y: 0, width: newSize.width, height: newSize.height)

    // Create new image
    UIGraphicsBeginImageContextWithOptions(newSize, false, 0)
    image.draw(in: rect)
    let newImage = UIGraphicsGetImageFromCurrentImageContext()
    UIGraphicsEndImageContext()

    // Return new image
    return newImage!
}