从纵向变为横向时，贝塞尔路径不会更新

如何解决从纵向变为横向时，贝塞尔路径不会更新

我有一个自定义 UIView 和一个表视图，它们都是以编程方式创建的。我的自定义 UIView 涉及一个 UIBezierPath 来创建它的形状。

我将此 UIView 添加到表视图 tableHeaderView 中，它具有动态高度。当我将我的应用程序从纵向旋转到横向时，曲线不会更新。任何帮助将不胜感激。

这是弯曲标题视图的所有代码：

class ExplanationCurvedHeaderView: UIView {

public lazy var headerView: UIView = {
    let view = UIView()
    view.translatesAutoresizingMaskIntoConstraints = false
    view.autoresizesSubviews = true
    view.autoresizingMask = [.flexibleWidth,.flexibleHeight]
    //view.backgroundColor = .gray
    return view
}()

private lazy var headerLabel: UILabel = {
    let headerLabel = UILabel()
    headerLabel.translatesAutoresizingMaskIntoConstraints = false
    headerLabel.numberOfLines = 0
    headerLabel.lineBreakMode = .byWordWrapping
    headerLabel.textAlignment = .center
    headerLabel.font = .systemFont(ofSize: 18,weight: .semibold)
    headerLabel.textColor = .black
    headerLabel.text = "Hello this is a test Hello this is a testHello this is a testHello this is a test Hello this is a test Hello this is a test Hello this is a test Hello this is a test Hello this is a test"
    return headerLabel
}()

public lazy var imageIcon: UIImageView = {
    let imageView = UIImageView()
    imageView.translatesAutoresizingMaskIntoConstraints = false
    imageView.contentMode = .scaleAspectFit
    imageView.image = UIImage(systemName: "exclamationmark.triangle.fill")
    return imageView
}()


override init(frame: CGRect) {
    super.init(frame: frame)
    configure()
}

required init?(coder: NSCoder) {
    fatalError("init(coder:) has not been implemented")
}

override func layoutSubviews() {
    super.layoutSubviews()
    createCurve()
}

func configure() {
    addSubview(headerView)
    headerView.addSubview(headerLabel)
    headerView.addSubview(imageIcon)
        
    NSLayoutConstraint.activate([
        headerView.topAnchor.constraint(equalTo: topAnchor,constant: -44),headerView.leadingAnchor.constraint(equalTo: leadingAnchor),headerView.trailingAnchor.constraint(equalTo: trailingAnchor),headerView.bottomAnchor.constraint(equalTo: bottomAnchor,constant: -80),headerLabel.topAnchor.constraint(equalTo: headerView.topAnchor,constant: 75),headerLabel.leadingAnchor.constraint(equalTo: headerView.leadingAnchor,constant: 20),headerLabel.trailingAnchor.constraint(equalTo: headerView.trailingAnchor,constant: -20),headerLabel.bottomAnchor.constraint(equalTo: headerView.bottomAnchor,imageIcon.centerXAnchor.constraint(equalTo: centerXAnchor),imageIcon.topAnchor.constraint(equalTo: headerView.bottomAnchor,constant: 10),imageIcon.heightAnchor.constraint(equalToConstant: 64),imageIcon.widthAnchor.constraint(equalToConstant: 64)

    ])
}

func createCurve() {        
    let shapeLayer = CAShapeLayer(layer: headerView.layer)
    shapeLayer.path = pathForCurvedView().cgPath
    //shapeLayer.frame = self.bounds
    shapeLayer.frame = headerView.bounds
    shapeLayer.fillColor = UIColor.lightGray.cgColor
    headerView.layer.mask = shapeLayer.mask
    headerView.layer.insertSublayer(shapeLayer,at: 0)
}

func pathForCurvedView() -> UIBezierPath {
    let path = UIBezierPath()
    path.move(to: CGPoint(x: 0,y: 0))
    path.addLine(to: CGPoint(x: UIScreen.main.bounds.maxX,y: headerView.frame.height + 30))
    path.addQuadCurve(to: CGPoint(x: UIScreen.main.bounds.minX,y:  headerView.frame.height + 30),controlPoint: CGPoint(x: UIScreen.main.bounds.midX,y: headerView.frame.height + 70))
    
    
    print("header view height:",headerView.frame.height)
    print("header label systemLayou:",headerLabel.systemLayoutSizefitting(UIView.layoutFittingExpandedSize))

    path.close()
    return path
}

}

这是视图控制器代码：

import UIKit

class ViewController: UIViewController {
    
    private lazy var headerView: ExplanationCurvedHeaderView = {
        let curvedView = ExplanationCurvedHeaderView(frame: .zero)
        return curvedView
    }()
    
    var arrayValues: [String] = []
        
    private lazy var tableView: UITableView = {
        let tableView = UITableView()
        tableView.translatesAutoresizingMaskIntoConstraints = false
        tableView.delegate = self
        tableView.dataSource = self
        tableView.frame = view.safeAreaLayoutGuide.layoutFrame
        return tableView
    }()
    
    /*
    
    Tried few things in this override but no correct results
    
    override func viewWillTransition(to size: CGSize,with coordinator: UIViewControllerTransitionCoordinator) {
        super.viewWillTransition(to: size,with: coordinator)
        coordinator.animate(alongsideTransition: { (UIViewControllerTransitionCoordinatorContext) -> Void in
            self.headerView.headerView.setNeedsLayout()
            self.headerView.createCurve()

            self.tableView.setNeedsLayout()
            self.tableView.setNeedsdisplay()
        })
    } */
    
    override func viewDidLoad() {
        for x in 1...6 {
            if x.isMultiple(of: 2) {
                arrayValues.append("Get To Invesin InvestinGet To Kn Get e o Kn Get eo Kn Get eo")
            } else {
                arrayValues.append("Get To Invesin InvestinGet To Kn Get e o Kn Get eo Kn Get eo Kn Get eo Kn Get eo Kn Get eo Kn Get eo Kn Get eo Kn Get e Get To Invesin InvestinGetGet To Invesin InvestinGetGet To Invesin InvestinGetGet To Invesin InvestinGetGet To Invesin InvestinGet  nvestinGetGenvestinGetGenvestinGetGenvestinGetGenvestinGetGe")
            }
        }
    
        tableView.register(CustomTableViewCell.self,forCellReuseIdentifier: "cell")
        //tableView.tableHeaderView = headerView
        view.addSubview(tableView)
        NSLayoutConstraint.activate([
            tableView.topAnchor.constraint(equalTo: view.topAnchor),tableView.leadingAnchor.constraint(equalTo: view.leadingAnchor),tableView.trailingAnchor.constraint(equalTo: view.trailingAnchor),tableView.bottomAnchor.constraint(equalTo: view.bottomAnchor),])
        tableView.tableHeaderView = headerView

    }

    
    override func viewDidLayoutSubviews() {
        super.viewDidLayoutSubviews()
        if let headerView = self.tableView.tableHeaderView {
            let headerViewFrame = headerView.frame
            
            let height = headerView.systemLayoutSizefitting(headerViewFrame.size,withHorizontalFittingPriority: UILayoutPriority.defaultHigh,verticalFittingPriority: UILayoutPriority.defaultLow).height
            var headerFrame = headerView.frame
            if height != headerFrame.size.height {
                headerFrame.size.height = height
                headerView.frame = headerFrame
                self.tableView.tableHeaderView = headerView
            }
        }
        headerView.layoutIfNeeded()
        tableView.beginUpdates()
        tableView.endUpdates()
    }
}



extension ViewController: UITableViewDataSource,UITableViewDelegate {
    func tableView(_ tableView: UITableView,numberOfRowsInSection section: Int) -> Int {
        return arrayValues.count
    }
    
    func tableView(_ tableView: UITableView,cellForRowAt indexPath: IndexPath) -> UITableViewCell {
        guard let cell = tableView.dequeueReusableCell(withIdentifier: "cell",for: indexPath) as? CustomTableViewCell else {
            return UITableViewCell()
        }
        cell.setValue(value: arrayValues[indexPath.row])
        return cell
    }
    
    func tableView(_ tableView: UITableView,estimatedHeightForHeaderInSection section: Int) -> CGFloat {
        return CGFloat.leastnormalMagnitude
    }
}

这也出现在控制台e：

2021-04-19 22:35:19.292199-0400 HeaderViewCurve[62191:1769385] [LayoutConstraints] 无法同时满足约束。 可能以下列表中的至少一项约束是您不想要的。 试试这个： (1) 查看每个约束并尝试找出您不期望的； (2) 找到添加不需要的约束或约束的代码并修复它。 ( "<0x6000022fac60 v: names:><0x6000022fad50 uilabel:0x7fdce741ce10.bottom="=" uiview:0x7fdce741cca0.bottom><0x6000022fab20 v: names:><0x6000022fac10 uiview:0x7fdce741cca0.bottom="=" headerviewcurve.explanationcurvedheaderview:0x7fdce740cf60.bottom><0x6000022f0460 headerviewcurve.explanationcurvedheaderview:0x7fdce740cf60.height="=">

将尝试通过打破约束来恢复<0x6000022fad50 uilabel:0x7fdce741ce10.bottom="=" uiview:0x7fdce741cca0.bottom>

在处创建一个符号断点以在调试器中捕获它。中列出的上的类别中的方法也可能有帮助。无法同时满足约束。可能以下列表中的至少一项约束是您不想要的。试试这个：查看每个约束并尝试找出您不期望的；找到添加不需要的约束或约束的代码并修复它。<0x6000022fab20 v: names:><0x6000022fac10 uiview:0x7fdce741cca0.bottom="=" headerviewcurve.explanationcurvedheaderview:0x7fdce740cf60.bottom><0x6000022f0460 headerviewcurve.explanationcurvedheaderview:0x7fdce740cf60.height="=">

将尝试通过打破约束来恢复<0x6000022fac10 uiview:0x7fdce741cca0.bottom="=" headerviewcurve.explanationcurvedheaderview:0x7fdce740cf60.bottom>

在处创建一个符号断点以在调试器中捕获它。中列出的上的类别中的方法也可能会有所帮助。

解决方法

根据的建议，我可以通过在视图控制器中添加它来解决我的问题

>