UIButton 系统样式选中状态，保留图片和背景答案

【问题标题】：UIButton System style selected state, keep image and backgroundUIButton 系统样式选中状态，保留图片和背景
【发布时间】：2019-11-21 08:41:53
【问题描述】：

使用 UIButton 的 System 样式时（不，我不想使用 Custom 样式，因为系统提供动画等...）

系统按钮的选中状态添加背景并移除图像

这是默认状态

我想实现这样的选定样式，其中选定时的外观与自定义按钮相同

【问题讨论】：

除了动画之外，自定义按钮还处理启用/选中状态下图像的不同颜色...更接近我的是系统处理

标签： swift cocoa-touch uibutton uikit

【解决方案1】：

好的，终于把那个弄出来了，关键是不允许切换到选中状态

class ControlButton: UIButton {

    var sImage: UIImage?
    var dImage: UIImage?

    override func awakeFromNib() {
        super.awakeFromNib()

        sImage = image(for: .selected)
        dImage = image(for: .normal)

    }

    override open var isSelected: Bool {

        set {
            if newValue {
                setImage(sImage, for: .normal)
            } else {
                setImage(dImage, for: .normal)
            }
        }
        get {
            return false
        }

    }

}

【讨论】：

【解决方案2】：

添加此类并将其设置为您的按钮类

class KButton: UIButton {

var view: UIButton!

@IBInspectable public var textPadding: CGFloat = 5.0 {
    didSet {
        layoutSubviews()
    }
}

@IBInspectable public var circleRadius: CGFloat = 10 {
    didSet {
        layoutSubviews()
    }
}

@IBInspectable public var circleWidth: CGFloat = 2.0 {
    didSet {
        layoutSubviews()
    }
}

@IBInspectable public var currentState: Bool = false {
    didSet {
        layoutSubviews()
    }
}

override func layoutSubviews() {
    super.layoutSubviews()
    if view != nil {
        view?.removeFromSuperview()
    }
    view = UIButton(frame: CGRect(x: -(self.frame.height) - textPadding, y: 0, width: self.frame.height, height: self.frame.height))
    view.backgroundColor = UIColor.clear

    let circlePath = UIBezierPath(arcCenter: CGPoint(x: view.frame.height/2, y: view.frame.height/2), radius: circleRadius, startAngle: 0, endAngle: CGFloat(Double.pi * 2), clockwise: true)
    let shapeLayer = CAShapeLayer()
    shapeLayer.path = circlePath.cgPath
    shapeLayer.fillColor = UIColor.clear.cgColor
    shapeLayer.strokeColor = self.tintColor.cgColor
    shapeLayer.lineWidth = circleWidth
    view.layer.addSublayer(shapeLayer)

    if currentState {
        let circlePath1 = UIBezierPath(arcCenter: CGPoint(x: view.frame.height/2, y: view.frame.height/2), radius: (circleRadius - (circleWidth * 2)), startAngle: 0, endAngle: CGFloat(Double.pi * 2), clockwise: true)
        let shapeLayer1 = CAShapeLayer()
        shapeLayer1.path = circlePath1.cgPath
        shapeLayer1.fillColor = self.tintColor.cgColor
        shapeLayer1.strokeColor = self.tintColor.cgColor
        shapeLayer1.lineWidth = circleWidth
        view.layer.addSublayer(shapeLayer1)
    }

    self.addSubview(view)
 }
}

然后在你点击动作

@IBAction func buttonClicked(_ sender: KButton) {
    sender.currentState = !sender.currentState
}

确保选择类型为 KButton

【讨论】：