NEW! Check out my latest book, Testing Swift! >>

How to scale, stretch, move and rotate UIViews using CGAffineTransform

Paul Hudson       @twostraws

Every UIView subclass has a transform property that lets you manipulate its size, position and rotation using something called an affine transform. This property is animatable, which means you can make a view smoothly double in size, or make it spin around, just by changing one value.

Here are some examples to get you started:

imageView.transform = CGAffineTransform(scaleX: 2, y: 2)
imageView.transform = CGAffineTransform(translationX: -256, y: -256)
imageView.transform = CGAffineTransform(rotationAngle: CGFloat.pi)
imageView.transform = CGAffineTransform.identity

The first one makes an image view double in size, the second one makes it move up and left 256 points, the third one makes it spin around 180 degrees (the values are expressed in radians), and the fourth one sets the image view's transform back to "identity" – this means "reset."

Available from iOS 2.0 – see Hacking with Swift tutorial 15

Did this solution work for you? Please pass it on!

Other people are reading…

About the Swift Knowledge Base

This is part of the Swift Knowledge Base, a free, searchable collection of solutions for common iOS questions.

Want to build macOS apps?

Hacking with macOS delivers 18 awesome projects that teach you macOS development in no time – take control of your desktop today!

MASTER SWIFT NOW
Buy Testing Swift Buy Practical iOS 12 Buy Pro Swift Buy Swift Design Patterns Buy Swift Coding Challenges Buy Server-Side Swift (Vapor Edition) Buy Server-Side Swift (Kitura Edition) Buy Hacking with macOS Buy Advanced iOS Volume One Buy Advanced iOS Volume Two Buy Hacking with watchOS Buy Hacking with tvOS Buy Hacking with Swift Buy Dive Into SpriteKit Buy Swift in Sixty Seconds Buy Objective-C for Swift Developers Buy Beyond Code

Was this page useful? Let me know!

Average rating: 4.9/5

Click here to visit the Hacking with Swift store >>