Swift中具有透明背景的按钮边框

问题描述

如何使 UIButton 边框看起来与下图(入门")按钮中的透明背景相似?

How can I make a UIButton border to look alike in the below image (the "Getting Started") button with a transparent background?

我应该如何使用情节提要或如何以编程方式做到这一点?

How should I achieve this using storyboard or how to do it programmatically?

推荐答案

将 backgroundColor 设置为 clearColor 使按钮透明.
试试下面的代码例子.您可以根据需要配置和更改borderAlpha、cornerRadius 和颜色.

Setting the backgroundColor to clearColor makes the button transparent.
Try the code below for example. You can configure and vary the borderAlpha,cornerRadius and colours as your want.

let borderAlpha : CGFloat = 0.7
let cornerRadius : CGFloat = 5.0

button.frame = CGRectMake(100, 100, 200, 40)
button.setTitle("Get Started", forState: UIControlState.Normal)
button.setTitleColor(UIColor.whiteColor(), forState: UIControlState.Normal)
button.backgroundColor = UIColor.clearColor()
button.layer.borderWidth = 1.0
button.layer.borderColor = UIColor(white: 1.0, alpha: borderAlpha).CGColor
button.layer.cornerRadius = cornerRadius

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