Ios UIButton来自不同状态的彩色背景图像
我试图创建一个Ios UIButton来自不同状态的彩色背景图像,ios,swift,uibutton,uikit,core-graphics,Ios,Swift,Uibutton,Uikit,Core Graphics,我试图创建一个UIButton子类,并从颜色中选择和禁用状态背景图像。UIButton将具有圆形边缘self.layer.cornerRadius=self.frame.height/2 class RoundedButton: UIButton { public var shadowOffset: CGSize = CGSize(width:0, height:0) { didSet{ self.layer.shadowOffset = shadowOffset
UIButton
子类,并从颜色中选择和禁用状态背景图像。UIButton将具有圆形边缘self.layer.cornerRadius=self.frame.height/2
class RoundedButton: UIButton {
public var shadowOffset: CGSize = CGSize(width:0, height:0) {
didSet{
self.layer.shadowOffset = shadowOffset
}
}
public var shadowRadius: CGFloat = 0.0 {
didSet{
self.layer.shadowRadius = shadowRadius
}
}
public var shadowOpacity: Float = 1.0 {
didSet{
self.layer.shadowOpacity = shadowOpacity
}
}
public var shadowColor: UIColor = UIColor.black {
didSet{
self.layer.shadowColor = shadowColor.cgColor
}
}
public var selectedBackgroundColor: UIColor = UIColor.black
override func layoutSubviews() {
super.layoutSubviews()
self.layer.cornerRadius = self.frame.height/2
self.setBackgroundImage(getImageWithColor(color: selectedBackgroundColor, size: self.frame.size, cornerRadius: self.frame.height/2), for: .selected)
}
func getImageWithColor(color: UIColor, size: CGSize, cornerRadius: CGFloat?) -> UIImage? {
let rect = CGRect(x:0, y:0, width:size.width, height:size.height)
UIGraphicsBeginImageContextWithOptions(size, false, 0)
color.setFill()
if cornerRadius != nil {
UIBezierPath(roundedRect: rect, cornerRadius: cornerRadius!).addClip()
}
UIRectFill(rect)
let image = UIGraphicsGetImageFromCurrentImageContext()
UIGraphicsEndImageContext()
return image
}
}
当我选择按钮时,它不起作用(我会在点击按钮时改变状态),奇怪的是,按钮只在第一次被点击时检测到。另一个奇怪的行为是,如果我指定一个普通的UIImage
(不是由核心图形创建的),它会工作,所以生成的图像可能有问题
请注意,我需要结合阴影、角半径和能够有不同于UIColor的背景按钮状态颜色 您没有为其他状态设置背景图像。在您的情况下,.normal、.disabled。您也不需要在
layoutSubviews
函数中设置图像。只需覆盖初始值设定项并为所有状态设置背景图像即可
或者,您可以观察isSelected
,isHighlighted
等,只需设置按钮的backgroundColor
属性