如何以编程方式调整 UIButton 内的图像大小？

Question

I have this UIButton and an image to fit in. I don't want that the image take all the space inside the button but just a little part of it right in the center, but if I resize the button it will resize the image too. How can I do that, is there an option to set whatever dimension I want independently from the size of the UIButton? Thanks!

Answer 1

This can be done through code in the following way:

    let imageSize:CGSize = CGSize(width: 20, height: 20)

    let button:UIButton = UIButton(type: UIButton.ButtonType.custom)
    button.frame = CGRect(x: 200, y: 200, width: 60, height: 60)
    button.backgroundColor = UIColor.yellow
    button.setImage(UIImage(named: "chat.png"), for: UIControl.State.normal)

    // The below line will give you what you want
    button.imageEdgeInsets = UIEdgeInsets(
        top: (button.frame.size.height - imageSize.height) / 2,
        left: (button.frame.size.width - imageSize.width) / 2,
        bottom: (button.frame.size.height - imageSize.height) / 2,
        right: (button.frame.size.width - imageSize.width) / 2)

    self.view.addSubview(button)

This way, you can achieve what you wanted.

Answer 2

You can experiment with image view insets. Every UIButton has a property imageView.

In Swift 3 you can do this like so:

//let button = UIButton()
button.imageView?.backgroundColor = UIColor.red
button.imageEdgeInsets = UIEdgeInsetsMake(10, 10, 10, 10)

red background is just so you know what is changing

Answer 3

I couldn't get the button's imageView to resize until I used contentHorizontalAlignment and contentVerticalAlignment both set to .fill. Then using imageEdgeInsets I repositioned the image.

let button = UIButton()
let image = UIImage(systemName: "bag.badge.plus")
button.setImage(image, for: .normal)
button.contentHorizontalAlignment = .fill
button.contentVerticalAlignment = .fill
button.imageEdgeInsets = UIEdgeInsets(top: 6, left: 6, bottom: 10, right: 10)

Result:

Answer 4

I would do it this way:

A UIButton is just a UIView . You can simply add a UIImageView with a set image and call addSubview on the UIButton .

Answer 5

Taking into account what KVISH said before i have implemented this and it worked as expected. I posted this because Houman asked for an example.

//grab the image using the name of the pic
var image = UIImage(named: "picture")

//set the size for the image
image = image?.resize(toWidth: 18)
image = image?.resize(toHeight: 18)

//set the image to the button
buttonName.setImage(image, for: UIControlState.normal)

//adjust the position
buttonName.imageEdgeInsets = UIEdgeInsetsMake(8,16,9,0)

Answer 6

These can be achieved by adding imageEdgeInsets to a UIButton.

In swift4.2

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

Answer 7

As of iOS 13, when using SF Symbols, I prefer this:

let button = UIButton()
let font = UIFont.systemFont(ofSize: 30) // <- make it larger, smaller, whatever you want. 
let config = UIImage.SymbolConfiguration(font: font)
let image = UIImage(systemName: "bag.badge.plus", withConfiguration: config)
button.setImage(image, for: .normal)