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

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.

Answer 2

Swift 3:

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

Answer 3

You can also do that from inteface builder like this.

I think it's helpful.

Answer 4

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 5

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 6

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