How to adjust an UIButton's imageSize?

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!
}

When changing icon size with
`UIEdgeInsetsMake(top, left, bottom, right)`, keep in mind button dimensions and the ability of UIEdgeInsetsMake to work with negative values as if they are positive.

Example: Two buttons with height 100 and aspect 1:1.

left.imageEdgeInsets = UIEdgeInsetsMake(40, 0, 40, 0)
right.imageEdgeInsets = UIEdgeInsetsMake(40, 0, 40, 0)
[![enter image description here][1]][1]

left.imageEdgeInsets = UIEdgeInsetsMake(40, 0, 40, 0)
right.imageEdgeInsets = UIEdgeInsetsMake(45, 0, 45, 0)
[![enter image description here][2]][2]

left.imageEdgeInsets = UIEdgeInsetsMake(40, 0, 40, 0)
right.imageEdgeInsets = UIEdgeInsetsMake(60, 0, 60, 0)
[![enter image description here][3]][3]


[1]:

[2]:

[3]:

Examples 1 and 3 are identical since ABS(100 - (40 + 40)) = ABS(100 - (60 + 60))

If your image is too large (and you can't/don't want to just made the image smaller), a combination of the first two answers works great.

addButton.imageView?.contentMode = .scaleAspectFit
addButton.imageEdgeInsets = UIEdgeInsetsMake(15.0, 15.0, 15.0, 5.0)

Unless you get the image insets just right, the image will be skewed without changing the `contentMode`.

**Updated for Swift > 5**

set the size:

button.frame = CGRect(x: 0, y: 0, width: 44, height: 44)

---

set margins:

button.imageEdgeInsets = UIEdgeInsets(top: 10, left: 10, bottom: 10, right: 10)

Here is the other solution to scale an imageView of UIButton.

button.imageView?.layer.transform = CATransform3DMakeScale(0.8, 0.8, 0.8)

If I understand correctly what you're trying to do, you need to play with the buttons image edge inset. Something like:

myLikesButton.imageEdgeInsets = UIEdgeInsets(top: 30, left: 30, bottom: 30, right: 30)

If you are using **symbolic images** for the button, then this solution is better:
```
button.setPreferredSymbolConfiguration(UIImage.SymbolConfiguration(pointSize: 48), forImageIn: .normal)
```

Insetting the image works for me, but I also needed the button Type to be Custom and the button Style to be Default. The defaults for a button added in Xcode 13 are System for Type and Plain for Style.

self.imageEdgeInsets = UIEdgeInsets(top: 3.0, left: 3.0, bottom: 3.0, right: 3.0)

[![enter image description here][1]][1]


[1]:

If you don't want to play around with image insets and you are using auto layout (which I assume you do), another solution is to add size constraints to the image view. Make sure the constraints have a priority of 999, otherwise auto layout will complain.

guard let imageView = button.imageView else { return }

let size = CGSize(width: 20, height: 20)
let sizeConstraints = [
imageView.widthAnchor.constraint(equalToConstant: size.width),
imageView.heightAnchor.constraint(equalToConstant: size.height)
]
imageView.translatesAutoresizingMaskIntoConstraints = false
sizeConstraints.forEach { $0.priority = UILayoutPriority(rawValue: priority) }
NSLayoutConstraint.activate(sizeConstraints)
imageView.contentMode = .scaleAspectFit

Swift :

button.setImage(UIImage(named: "checkmark_white"), for: .normal)
button.contentVerticalAlignment = .fill
button.contentHorizontalAlignment = .fill
button.imageEdgeInsets = UIEdgeInsets(top: 10, left: 10, bottom: 10, right: 10)