Swift 4中的iOS UIKit：创建带有动画的按钮

预习

资源

项目

https://github.com/calmone/iOS-UIKit-component

参考

• UIButton
  https://developer.apple.com/reference/uikit/uibutton
• CGAffinTransform https://developer.apple.com/reference/coregraphics/cgaffinetransform

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