How to Adjust an UIButton’s Image Size in Swift

How to Adjust an UIButton's Image Size in Swift

28 February 2025 Stephan Petzl Leave a comment Xcode

Adjusting the image size of a UIButton can be crucial for achieving the desired UI design in your iOS applications. There are several techniques you can employ to resize the image within a UIButton to better fit your layout requirements. Below, we provide a step-by-step guide on how to effectively manage UIButton image sizes using various methods available in Swift.

Method 1: Using Image Edge Insets

One common approach to resizing a UIButton’s image is by adjusting the image edge insets. This method allows you to define margins around the image, effectively resizing it within the button.


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

This code snippet sets the top, left, bottom, and right insets to 30 points, effectively reducing the image size within the button.

Method 2: Setting the Content Mode

Another efficient method is to adjust the content mode of the button’s UIImageView. This method is particularly useful when you want to maintain the aspect ratio of the image.


myButton.imageView?.contentMode = .scaleAspectFit

By setting the content mode to scaleAspectFit, the image will scale to fit within the button while maintaining its aspect ratio.

Method 3: Using Transformations

If you need more control over the scaling, you can apply a transformation to the button’s image view. This method allows you to specify the exact scale factor.


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

This code snippet scales the image to 80% of its original size.

Method 4: Preferred Symbol Configuration

For symbolic images, you can use the setPreferredSymbolConfiguration method to directly set the point size of the image.


button.setPreferredSymbolConfiguration(UIImage.SymbolConfiguration(pointSize: 48), forImageIn: .normal)

This method is ideal for resizing scalable vector graphics, such as SF Symbols.

Choosing the Right Method

The choice of method depends on your specific needs:

  • Use Image Edge Insets for simple resizing when you know the exact margins.
  • Opt for Content Mode when you want to maintain the aspect ratio without specifying exact sizes.
  • Apply Transformations when you need precise control over the scaling factor.
  • Use Preferred Symbol Configuration for scalable vector images.

Enhancing UI Testing with Repeato

Once you’ve mastered adjusting UIButton image sizes, ensuring consistent UI behavior across different devices is crucial. This is where Repeato, a No-code test automation tool, can significantly enhance your testing process. With Repeato, you can easily create, run, and maintain automated tests for your iOS applications without writing code. Its fast test recording and execution capabilities, powered by computer vision and AI, make it an excellent choice for thorough UI testing. Moreover, Repeato’s support for data-driven and keyword-driven testing allows you to cover various testing scenarios effortlessly.

For more information on how Repeato can streamline your UI testing process, visit our documentation or explore our blog for the latest updates.

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