我正在尝试更新我在子类中创建的圆圈的颜色UIView通过在类中创建一个方法来更新颜色，如下所示，但颜色不会改变。
import UIKit
class badge: UIView {
struct mine {
static var p = UIBezierPath(ovalInRect: CGRectMake(0,0,100,100))
}
override func drawRect(rect: CGRect) {
// Drawing code
UIColor.blueColor().setFill()
mine.p.fill()
}
func colour(whatColour: String) {
UIColor.redColor().setFill()
mine.p.fill()
self.setNeedsDisplay()
}
}
// The above is referenced in view controller with
@IBOutlet weak var myBadge: badge!
// change function colour is called with
myBadge.colour()
// but the colour of the circle does not change (its still filled in blue)
}
我究竟做错了什么？
更新：Swift 3（和 Swift 4）语法:
setNeedsDisplay causes draw再次运行，它将填充颜色设置回蓝色。尝试将属性添加到您的Badge视图来存储desiredColour:
class Badge: UIView {
var desiredColour: UIColor = .blue
struct mine {
static var p = UIBezierPath(ovalIn: CGRect(x: 0, y: 0, width: 100, height: 100))
}
override func draw(_ rect: CGRect) {
// Drawing code
desiredColour.setFill()
mine.p.fill()
}
func colour() {
desiredColour = .red
self.setNeedsDisplay()
}
}
如果你添加didSet to desiredColour，你可以让它调用setNeedsDisplay为你，然后你甚至不需要colour功能。所以要使用它，你只需调用myBadge.desiredColour = .red并且视图将重绘！
class Badge: UIView {
var desiredColour: UIColor = .blue {
didSet {
self.setNeedsDisplay()
}
}
struct mine {
static var p = UIBezierPath(ovalIn: CGRect(x: 0, y: 0, width: 100, height: 100))
}
override func draw(_ rect: CGRect) {
// Drawing code
desiredColour.setFill()
mine.p.fill()
}
}
它在 Swift Playground 中运行：
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