在uibutton内旋转png

Question

I have a UIButton inside a titleView of a UINavigationBar. I want to rotate a downwards caret image 180 degrees every time the user taps a given button.

Answer 1

Here's an example of how can you do it using Transforms:- The code works with all the elements that inherits from UIView

UIView.animate(withDuration: 0.5) {
            self.yourButton.imageView?.transform = CGAffineTransform(rotationAngle: CGFloat.pi)

}

To set it back to original position:-

UIView.animate(withDuration: 0.5) {
      self.yourButton.imageView?.transform = .identity)

}