How iOS12-Swift5-Xcode10- change UIButton background image contentMode

Button to find out which of two image attributes:

Image: Set button images will overwrite the text inside

Background: Set button background image, the text inside still display

Most real development, we set the button in the main image, more convenient way to set the picture contentMode.

let btn = UIButton() //或是storyboard上拉过来的button的outlet
//...
btn.setImage(UIImage(named: "xxx"), for: .normal) //一般状态时的图片
btn.setImage(UIImage(named: "xxx"), for: .highlighted) //按钮被touch之后的图片
btn.imageView?.contentMode = .scaleAspectFit
复制代码

 

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Reproduced in: https: //juejin.im/post/5d0717455188254a10112810