如何在 Swift 中设置 UIButton 背景颜色 forState: UIControlState.Highlighted-移动开发问题

How do I set UIButton background color forState: UIControlState.Highlighted in Swift(如何在 Swift 中设置 UIButton 背景颜色 forState: UIControlState.Highlighted)

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问题描述

我可以为按钮设置背景颜色，但我不知道如何为 UIControlState.Highlighted 设置背景颜色.甚至可能吗?还是我需要走 setBackgroundImage 路径?

I can set the background color for a button but I can't work out how to set the background color for UIControlState.Highlighted. Is it even possible? or do I need to go down the setBackgroundImage path?

推荐答案

如果有人路过，如果你不止一次需要它，另一种方法可能更容易......我为 UIButton 写了一个简短的扩展，它工作得很好:

If anyone stops by, another way to go maybe more easily if it is something you need more than once... I wrote a short extension for UIButton, it works just fine:

对于 Swift 3

extension UIButton {
    func setBackgroundColor(color: UIColor, forState: UIControlState) {
        UIGraphicsBeginImageContext(CGSize(width: 1, height: 1))
        CGContextSetFillColorWithColor(UIGraphicsGetCurrentContext(), color.CGColor)
        CGContextFillRect(UIGraphicsGetCurrentContext(), CGRect(x: 0, y: 0, width: 1, height: 1))
        let colorImage = UIGraphicsGetImageFromCurrentImageContext()
        UIGraphicsEndImageContext()

        self.setBackgroundImage(colorImage, forState: forState)
    }
}

对于 Swift 4

extension UIButton {
    func setBackgroundColor(color: UIColor, forState: UIControl.State) {
        self.clipsToBounds = true  // add this to maintain corner radius
        UIGraphicsBeginImageContext(CGSize(width: 1, height: 1))
        if let context = UIGraphicsGetCurrentContext() {
            context.setFillColor(color.cgColor)
            context.fill(CGRect(x: 0, y: 0, width: 1, height: 1))
            let colorImage = UIGraphicsGetImageFromCurrentImageContext()
            UIGraphicsEndImageContext()
            self.setBackgroundImage(colorImage, for: forState)
        }
    }
}

你像 setBackgroundImage 一样使用它:

yourButton.setBackgroundColor(color: UIColor.white, forState: UIControl.State.highlighted)

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