How to adjust an UIButton's imageSize? - ios

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:UIControlStateNormal];
However this fills up the image to the full button, how do I make the image smaller?
Historic note:
For this now 10+ yr old question, you now typically just set the point size using setPreferredSymbolConfiguration

Answer 1

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)

Answer 2

Tim's answer is correct, however I wanted to add another suggestion, because in my case there was a simpler solution altogether.
I was looking to set the UIButton image insets because I didn't realize that I could set the content mode on the button's UIImageView, which would have prevented the need to use UIEdgeInsets and hard-coded values altogether. Simply access the underlying imageview on the button and set the content mode:
myButton.imageView.contentMode = UIViewContentModeScaleAspectFit;
See UIButton doesn't listen to content mode setting?
Swift 3
myButton.imageView?.contentMode = .scaleAspectFit

Answer 3

Swift 3:
button.setImage(UIImage(named: "checkmark_white"), for: .normal)
button.contentVerticalAlignment = .fill
button.contentHorizontalAlignment = .fill
button.imageEdgeInsets = UIEdgeInsetsMake(10, 10, 10, 10)

Answer 4

Here is the other solution to scale an imageView of UIButton.
button.imageView?.layer.transform = CATransform3DMakeScale(0.8, 0.8, 0.8)

Answer 5

You can also do that from inteface builder like this.
I think it's helpful.

Answer 6

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.

Answer 7

you can use imageEdgeInsets property
The inset or outset margins for the rectangle around the button’s image.
[self.btn setImageEdgeInsets:UIEdgeInsetsMake(6, 6, 6, 6)];
A positive value shrinks, or insets, that edge—moving. A negative value expands, or outsets, that edge.

Answer 8

Heres the Swift version:
myButton.imageEdgeInsets = UIEdgeInsets(top: 10, left: 10, bottom: 10, right: 10)

Answer 9

Swift 4
You would need to use these two lines of code, in this specific order. All you need is to change the top and bottom value of the edge insets.
addButton.imageView?.contentMode = .scaleAspectFit
addButton.imageEdgeInsets = UIEdgeInsetsMake(10.0, 0.0, 10.0, 0.0)

Answer 10

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)

Answer 11

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

Answer 12

With the help of Tim C's answer, I was able to create an extension on UIButton using Swift that allows you to specify the image frame by using the .setImage() function with an extra frame parameter
extension UIButton{
func setImage(image: UIImage?, inFrame frame: CGRect?, forState state: UIControlState){
self.setImage(image, forState: state)
if let frame = frame{
self.imageEdgeInsets = UIEdgeInsets(
top: frame.minY - self.frame.minY,
left: frame.minX - self.frame.minX,
bottom: self.frame.maxY - frame.maxY,
right: self.frame.maxX - frame.maxX
)
}
}
}
Using this, if you wanted to set the frame of a UIButton to CGRectMake(0, 0, 64, 64), and set the image of it to myImage with a frame of CGRectMake(8, 8, 48, 48), you could use
let button: UIButton = UIButton(frame: CGRectMake(0, 0, 64, 64))
button.setImage(
myImage,
inFrame: CGRectMake(8, 8, 48, 48),
forState: UIControlState.Normal
)

Answer 13

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)
left.imageEdgeInsets = UIEdgeInsetsMake(40, 0, 40, 0)
right.imageEdgeInsets = UIEdgeInsetsMake(45, 0, 45, 0)
left.imageEdgeInsets = UIEdgeInsetsMake(40, 0, 40, 0)
right.imageEdgeInsets = UIEdgeInsetsMake(60, 0, 60, 0)
Examples 1 and 3 are identical since ABS(100 - (40 + 40)) = ABS(100 - (60 + 60))

Answer 14

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)

Answer 15

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!
}

Answer 16

Swift 3
I set myButton width and height to 40 and my padding from EdgeInsetsMake is 15 all sides. I suggest to add a background color to your button to see the actual padding.
myButton.backgroundColor = UIColor.gray // sample color to check padding
myButton.imageView?.contentMode = .scaleAspectFit
myButton.imageEdgeInsets = UIEdgeInsetsMake(15, 15, 15, 15)

Answer 17

Updated for Swift 3
yourButtonName.imageEdgeInsets = UIEdgeInsetsMake(10, 10, 10, 10)

Answer 18

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

Answer 19

i think, your image size is also same as button size then you put image in background of the button like :
[myLikesButton setBackgroundImage:[UIImage imageNamed:#"icon-heart.png"] forState:UIControlStateNormal];
you mast have same size of image and button.i hope you understand my point.