iOS 中的四点渐变

Swift
import UIKit
class GradientViewController: UIViewController {
    override func viewDidLoad() {
        super.viewDidLoad()
        
        // 创建渐变色视图
        let gradientView = UIView(frame: view.bounds)
        view.addSubview(gradientView)
        
        // 创建渐变层
        let gradientLayer = CAGradientLayer()
        gradientLayer.frame = gradientView.bounds
        
        // 设置渐变色的起始点和结束点
        gradientLayer.startPoint = CGPoint(x: 0, y: 0)
        gradientLayer.endPoint = CGPoint(x: 1, y: 1)
        
        // 设置渐变色的颜色数组
        gradientLayer.colors = [UIColor.red.cgColor, UIColor.blue.cgColor, UIColor.green.cgColor, UIColor.yellow.cgColor]
        
        // 设置渐变色在起始点和结束点之间的位置
        gradientLayer.locations = [0, 0.3, 0.6, 1]
        
        // 将渐变层添加到渐变色视图上
        gradientView.layer.addSublayer(gradientLayer)
    }
}