ios - tableHeaderView 内容的高度将无法正常工作

Question

我正在尝试通过放置在其中的 UILabel 设置 tableHeaderView 高度。但由于某种原因，我遇到了问题，高度小于标签的内容，有时标签不会显示全文。

这就是它的样子:

它应该是这样的:

这是我的代码:

extension UITableView {
    public func relayoutTableHeaderView() {
        if let tableHeaderView = tableHeaderView {
            let labels = tableHeaderView.findViewsOfClass(viewClass: UILabel.self)
            for label in labels {
                label.preferredMaxLayoutWidth = label.frame.width
            }
            tableHeaderView.setNeedsLayout()
            tableHeaderView.layoutIfNeeded()
            tableHeaderView.frame.size.height = tableHeaderView.systemLayoutSizeFitting(UIView.layoutFittingCompressedSize).height
            self.tableHeaderView = tableHeaderView
            print(tableHeaderView.frame)
        }
    }
}

extension UIView {
    public func findViewsOfClass<T:UIView>(viewClass: T.Type) -> [T] {
        var views: [T] = []
        for subview in subviews {
            if subview is T {
                views.append(subview as! T)
            }
            views.append(contentsOf: subview.findViewsOfClass(viewClass: T.self))
        }
        return views
    }
}

这段代码的资源here .

Answer 1

您没有使用将行数归零

    extension UITableView {
    public func relayoutTableHeaderView() {
        if let tableHeaderView = tableHeaderView {
            let labels = tableHeaderView.findViewsOfClass(viewClass: UILabel.self)
            for label in labels {
                label.preferredMaxLayoutWidth = label.frame.width
                label.numberOfLines = 0
            }
            tableHeaderView.setNeedsLayout()
            tableHeaderView.layoutIfNeeded()
            tableHeaderView.frame.size.height = tableHeaderView.systemLayoutSizeFitting(UIView.layoutFittingCompressedSize).height
            self.tableHeaderView = tableHeaderView
            print(tableHeaderView.frame)
        }
    }
}