向导航栏添加渐变将隐藏iOS 13.0 +中的栏按钮项

import UIKit
import CoreGraphics

class GradientNavigationBar: UINavigationBar {
    
}

override func draw(_ rect: CGRect) {
    let gradientLayer = CAGradientLayer()
    gradientLayer.frame = bounds
    gradientLayer.colors = [UIColor.red.cgColor, UIColor.blue.cgColor] // 设置渐变颜色
    gradientLayer.startPoint = CGPoint(x: 0, y: 0) // 渐变起点
    gradientLayer.endPoint = CGPoint(x: 1, y: 0) // 渐变终点
    
    if let context = UIGraphicsGetCurrentContext() {
        context.saveGState()
        gradientLayer.render(in: context)
        context.restoreGState()
    }
}

override func viewDidLoad() {
    super.viewDidLoad()
    
    let gradientNavigationBar = GradientNavigationBar()
    navigationController?.navigationBar = gradientNavigationBar
}