swift - 更改背景颜色但保持 UISwitch "On"状态的色调

Question

当 UISwitch 处于“on”状态时，有什么方法可以改变背景颜色同时保持灰色边框吗？

通过设置:

switch.onTintColor = myGreen

开关的边框也变为绿色。但在关闭状态下，背景是透明的。

Answer 1

用灰色着色的区域将是开关层的 borderColor。因此，通过执行以下操作，无论状态如何，边界仍然是相同的。

sender.layer.borderColor = UIColor.gray.cgColor // sender would be the switch if you where to change the color when the switch value has been changed 

默认情况下，您可以通过这样做来添加灰色层:

    let switcher = UISwitch()
    switcher.layer.masksToBounds = true
    switcher.layer.borderColor = UIColor.gray.cgColor // <-- we'll add the gray color
    switcher.layer.borderWidth = 2.0 // controll the width or thickness of the border
    switcher.layer.cornerRadius = 15 // from 15 and up you starting getting that round effect 
    switcher.frame = CGRect(x: 50, y: 100, width: 100, height: 40)
    switcher.addTarget(self , action: #selector(didPress), for: .valueChanged)

所以现在每次开关打开和关闭时你都可以改变颜色

@objc func didPress(sender: UISwitch) {
        switch sender.isOn {
        case true:
            sender.backgroundColor = .green
        case false:
            sender.backgroundColor = .orange
        }
    }