Question

我有TableViewController标题。此标头是一个容器，它链接到另一个名为Header.storyboard

的故事板

Header.storyboard包含带有一些标签的堆栈视图，这些标签是动态类型的。

标签文字来自数据库。

不考虑文本维度或大小我想要正确地将其可视化。

我使用了SO的一些答案来正确调整标题大小，但没有运气：

import UIKit

class TableViewController: UITableViewController {

    @IBOutlet weak var tableHeaderView: UIView!

    override func viewDidLayoutSubviews() {
        super.viewDidLayoutSubviews()

        // Dynamic sizing for the header view
        if let headerView = tableHeaderView {
            headerView.setNeedsLayout()
            headerView.layoutIfNeeded()

            let height = headerView.systemLayoutSizeFitting(UILayoutFittingCompressedSize).height
            var headerFrame = headerView.frame

            // If we don't have this check, viewDidLayoutSubviews() will get
            // repeatedly, causing the app to hang.
            if height != headerFrame.size.height {
                headerFrame.size.height = height
                headerView.frame = headerFrame
                tableHeaderView = headerView
           }
       }
   }
}

Answer 1

首先，您应该为标签指定高度

，而不是给视图赋予高度

class ViewController : UITableViewController {

override func viewDidLoad() {
    super.viewDidLoad()
    // Do any additional setup after loading the view, typically from a nib.
}

override func didReceiveMemoryWarning() {
    super.didReceiveMemoryWarning()
    // Dispose of any resources that can be recreated.
}

override func tableView(_ tableView: UITableView, heightForRowAt indexPath: IndexPath) -> CGFloat {
    return 40
}

override func tableView(_ tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
    return 4
}

override func numberOfSections(in tableView: UITableView) -> Int {
    return 1
}

override func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {
    let cell = tableView.dequeueReusableCell(withIdentifier: "cell", for: indexPath)

    cell.backgroundColor = UIColor.yellow
    cell.textLabel?.text = "Baran"

    return cell

}

override func tableView(_ tableView: UITableView, heightForHeaderInSection section: Int) -> CGFloat
{
    return heightForView()
}

override func tableView(_ tableView: UITableView, viewForHeaderInSection section: Int) -> UIView? {
    let headerView : UIView = UIView(frame: CGRect(x: 0, y: 20, width: self.view.frame.width, height: self.heightForView()))
    headerView.backgroundColor = UIColor.black

    let label : UILabel = UILabel(frame: CGRect(x: 0, y: 0, width: self.view.frame.width, height: self.heightForView()))
    label.numberOfLines = 0
    label.textAlignment = NSTextAlignment.center
    label.text = "Size To Fit Tutorial"
    label.font = UIFont(name: "Helvetica", size: 50)
    label.textColor = UIColor.white
    headerView.addSubview(label)

    return headerView
}

//Self Sizing height ....
func heightForLabel(text:String, font:UIFont, width:CGFloat) -> CGFloat{
    let label:UILabel = UILabel(frame: CGRect(x: 0, y: 0, width: width, height: CGFloat.greatestFiniteMagnitude))
    label.numberOfLines = 0
    label.lineBreakMode = NSLineBreakMode.byCharWrapping
    label.font = font
    label.text = text
    label.sizeToFit()
    return label.frame.height
}

func heightForView() -> CGFloat{

    let screenSize = UIScreen.main.bounds
    let screenWidth = screenSize.width

    let text = "Size To Fit Tutorial"
    let font : UIFont!
    switch UIDevice.current.userInterfaceIdiom {
    case .pad:
        font = UIFont(name: "Helvetica", size: 35)
    case .phone:
        font = UIFont(name: "Helvetica", size: 50)
    default:
        font = UIFont(name: "Helvetica", size: 24)
    }
    let height = heightForLabel(text: text, font: font, width: screenWidth)

    return height
}
}

enter image description here

希望这会有所帮助

Answer 2

表视图标题可以自动调整大小

但是使用容器可能无法正常工作

使用自定义视图代替viewForHeaderInSection

class ViewController: UITableViewController {
    override func viewDidLoad() {
        tableView.estimatedSectionHeaderHeight = 10
        tableView.sectionHeaderHeight = UITableViewAutomaticDimension
    }
    override func tableView(_ tableView: UITableView, viewForHeaderInSection section: Int) -> UIView? {
        let lab = UILabel()
        lab.text = "text \(section)"
        lab.font = UIFont.systemFont(ofSize: 10 * CGFloat(section) + 1)
        return lab
    }
    override func numberOfSections(in tableView: UITableView) -> Int {
        return 5
    }
    //this method overriding is not necessary
    override func tableView(_ tableView: UITableView, heightForHeaderInSection section: Int) -> CGFloat {
        return UITableViewAutomaticDimension
    }
}

Answer 3

尝试实施

tableView(_ tableView: UITableView, heightForHeaderInSection section: Int)

和

tableView(_ tableView: UITableView, viewForHeaderInSection section: Int)
您的代码应如下所示：

func tableView(_ tableView: UITableView, heightForHeaderInSection section: Int) -> CGFloat {
    return tableHeaderView.bounds.size.height
}

func tableView(_ tableView: UITableView, viewForHeaderInSection section: Int) -> UIView? {
    return tableHeaderView
}

Answer 4

对于Xcode 11，iOS 13-我只需要在Interface Builder中打勾这两个框：

使用动态类型时调整表头的大小

4 个答案: