How to Scale a Uibutton's Imageview

How to adjust an UIButton's imageSize?

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)

How to scale image and center it on a UIButton in Swift?

Xcode 8.3.1 • Swift 3.1

let button = UIButton(type: .custom)
let image = UIImage(named: "myimage.png")

func buttonTouchDown(_ button: UIButton) {
    print("button Touch Down")
}

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override func viewDidLoad() {
    super.viewDidLoad()
    button.frame = CGRect(x: 0, y: 0 , width: 100, height: 100)
    button.backgroundColor = .clear
    button.addTarget(self, action: #selector(buttonTouchDown), for: .touchDown)
    button.setTitle("Title", for: .normal)
    button.setTitleColor(.black, for: .normal)
    button.setImage(image, for: .normal)
    button.imageEdgeInsets = UIEdgeInsetsMake(25,25,25,25)
    view.addSubview(button)
}

How to scale UIButton without scaling image in Swift?

You can set Image in button Image. will not scale but you can set button as you want. See in the image my button have 100*100 image and button have more size than image.

scale Image in an UIButton to AspectFit?

If you really want to scale an image, do it, but you should resize it before using it. Resizing it at run time will just lose CPU cycles.

This is the category I'm using to scale an image :

UIImage+Extra.h

@interface UIImage (Extras)
- (UIImage *)imageByScalingProportionallyToSize:(CGSize)targetSize;
@end;

UIImage+Extra.m

@implementation UIImage (Extras)

- (UIImage *)imageByScalingProportionallyToSize:(CGSize)targetSize {

UIImage *sourceImage = self;
UIImage *newImage = nil;

CGSize imageSize = sourceImage.size;
CGFloat width = imageSize.width;
CGFloat height = imageSize.height;

CGFloat targetWidth = targetSize.width;
CGFloat targetHeight = targetSize.height;

CGFloat scaleFactor = 0.0;
CGFloat scaledWidth = targetWidth;
CGFloat scaledHeight = targetHeight;

CGPoint thumbnailPoint = CGPointMake(0.0,0.0);

if (!CGSizeEqualToSize(imageSize, targetSize)) {

        CGFloat widthFactor = targetWidth / width;
        CGFloat heightFactor = targetHeight / height;

        if (widthFactor < heightFactor) 
                scaleFactor = widthFactor;
        else
                scaleFactor = heightFactor;

        scaledWidth  = width * scaleFactor;
        scaledHeight = height * scaleFactor;

        // center the image

        if (widthFactor < heightFactor) {
                thumbnailPoint.y = (targetHeight - scaledHeight) * 0.5; 
        } else if (widthFactor > heightFactor) {
                thumbnailPoint.x = (targetWidth - scaledWidth) * 0.5;
        }
}

// this is actually the interesting part:

UIGraphicsBeginImageContextWithOptions(targetSize, NO, 0);

CGRect thumbnailRect = CGRectZero;
thumbnailRect.origin = thumbnailPoint;
thumbnailRect.size.width  = scaledWidth;
thumbnailRect.size.height = scaledHeight;

[sourceImage drawInRect:thumbnailRect];

newImage = UIGraphicsGetImageFromCurrentImageContext();
UIGraphicsEndImageContext();

if(newImage == nil) NSLog(@"could not scale image");

return newImage ;
}

@end

You can use it to the size you want. Like :

[self.itemImageButton setImage:[stretchImage imageByScalingProportionallyToSize:CGSizeMake(20,20)]];

How to set image size in UIButton?

There may be two options to fix the problem.

1. Set the content mode to .scaleAspectFit and the image should not go out of the bounds :
   myButton.imageView?.contentMode = .scaleAspectFit

2. Adjust the image insets:
   myLikesButton.imageEdgeInsets = UIEdgeInsetsMake(top, left, bottom, right)

How to resize an image inside an UIButton programmatically?

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.

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