ios - 如何在单个 UIView 中添加 3 种背景颜色？

Question

我需要在单一背景色中添加三种颜色

不使用 3 个 UIView 或图像。

Answer 1

创建自定义 UIView 并覆盖 draw(_:) 函数。然后使用当前的 CGContext 并根据您喜欢的大小进行绘制。基于给定图像对齐的示例如下所示:

class CustomView: UIView {
    override func draw(_ rect: CGRect) {
        super.draw(rect)
        guard let context = UIGraphicsGetCurrentContext() else {
            return
        }

        let firstRect = CGRect(origin: CGPoint(x: rect.origin.x, y: rect.origin.y), size: CGSize(width: rect.size.width / 3, height: rect.size.height))
        let middleRect = CGRect(origin: CGPoint(x: firstRect.maxX, y: rect.origin.y), size: CGSize(width: rect.size.width / 3, height: rect.size.height))
        let lastRect = CGRect(origin: CGPoint(x: middleRect.maxX, y: rect.origin.y), size: CGSize(width: rect.size.width / 3, height: rect.size.height))

        let arrayTuple: [(rect: CGRect, color: CGColor)] = [(firstRect, UIColor.red.cgColor), (middleRect, UIColor.green.cgColor), (lastRect, UIColor.blue.cgColor)]
        for tuple in arrayTuple {
            context.setFillColor(tuple.color)
            context.fill(tuple.rect)
        }
    }
}