UIAnimate只在按钮上发生一次 [英] UIAnimate only happens once on button

问题描述

我的应用中有一个带有背景图片的按钮。按下按钮时，我希望它旋转90度。下面的代码是我的IBAction。它第一次完美地工作，但每次按下按钮它都不会旋转。

I have a button in my app that has a background image. When the button is pressed I want it to rotate 90 degrees. The code below is my IBAction. It works perfectly the first time, but every other time I press the button it doesn't rotate.

@IBAction func addButton(_ sender: UIButton) {
    UIView.animate(withDuration: 0.05, animations: ({
        sender.transform = CGAffineTransform(rotationAngle: CGFloat(Double.pi / 2))
    }))
}

推荐答案

您始终将变换设置为90度。如果您想在每次点击按钮时再旋转90度，则需要更新现有变换。

You always set the transform to 90 degrees. If you want to rotate an additional 90 degrees each time you tap the button you need to update the existing transform.

sender.transform = sender.transform.rotated(by: CGFloat(Double.pi / 2))

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