在uibutton内旋转png [英] rotate png inside uibutton

问题描述

我在UINavigationBar的titleView中有一个UIButton.我想每次用户点击给定按钮时将向下的插入符号图像旋转180度.

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.

推荐答案

下面是使用Transforms的示例:-该代码适用于从UIView继承的所有元素

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)

}

要将其设置回原始位置:-

To set it back to original position:-

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

}

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