将以tableview作为其子视图的视图设置为渐变颜色

import UIKit
import QuartzCore

class GradientView: UIView {
    override init(frame: CGRect) {
        super.init(frame: frame)
        
        let gradientLayer = CAGradientLayer()
        gradientLayer.frame = bounds
        gradientLayer.colors = [UIColor.red.cgColor, UIColor.blue.cgColor] // 设置起始颜色和结束颜色
        layer.addSublayer(gradientLayer)
    }
    
    required init?(coder aDecoder: NSCoder) {
        fatalError("init(coder:) has not been implemented")
    }
}

class ViewController: UIViewController {
    override func viewDidLoad() {
        super.viewDidLoad()
        
        let gradientView = GradientView(frame: view.bounds)
        view.addSubview(gradientView)
        
        let tableView = UITableView(frame: gradientView.bounds)
        gradientView.addSubview(tableView)
        
        // 可以在这里进行tableview的其他设置
    }
}