iOS 13-UIMenu是否存在不显示其图像的错误? [英] Does iOS 13 - UIMenu have a bug that doesn't show its image?

问题描述

将以下代码粘贴到项目中:

Paste the following code into a project:

设备蜂蜜"(即UIMenu)旁边没有图像 但是，图像显示在复制"旁边，即UIACtion.

No image shows next to 'Device Honey' ie the UIMenu However the image shows up next to 'Copy' ie the UIACtion.

我做错什么了吗?如果这是一个错误?有解决方法吗?

Am I doing something wrong? If this is a bug? Is there a workaround?

class ViewController: UIViewController {
    let tableview: UITableView = {
        let tv = UITableView()
        tv.frame = UIScreen.main.bounds

        return tv
    }()

    override func viewDidLoad() {
        super.viewDidLoad()
        view.addSubview(tableview)
        tableview.register(UITableViewCell.self, forCellReuseIdentifier: "cell")
        tableview.delegate = self
        tableview.dataSource = self
    }
}

extension ViewController: UITableViewDelegate, UITableViewDataSource {
    func tableView(_ tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
        return 1
    }
    func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {
        var cell = tableView.dequeueReusableCell(withIdentifier: "cell", for: indexPath)
        if cell.detailTextLabel == nil {
            cell = UITableViewCell(style: .value1, reuseIdentifier: "cell")
        }
        cell.textLabel?.text = "Honey"
        cell.detailTextLabel?.text = "iOS developer"

        return cell
    }

    @available(iOS 13.0, *)
    func tableView(_ tableView: UITableView, contextMenuConfigurationForRowAt indexPath: IndexPath, point: CGPoint) -> UIContextMenuConfiguration? {

        return UIContextMenuConfiguration(identifier: nil, previewProvider: nil, actionProvider: { suggestedActions in

            return self.makeContextMenu(for: indexPath)
        })
    }

    @available(iOS 13.0, *)
    func makeContextMenu(for indexPath: IndexPath) -> UIMenu? {

        let copyAction = UIAction(title: "Copy", image: UIImage(systemName: "square.and.arrow.up")) { [weak self] _ in
            guard let self = self else { return }
            let cell = self.tableview.cellForRow(at: indexPath)
            let pasteboard = UIPasteboard.general
            pasteboard.string = cell?.detailTextLabel?.text
        }

        guard let cell = self.tableview.cellForRow(at: indexPath), let title = cell.textLabel?.text else { return nil}
        return UIMenu(title: "Device \(title) ", image: UIImage(systemName: "square.and.arrow.up"), children: [copyAction])
    }
}

在Apple的WWDC演示中，他们可以执行以下操作:

In Apple's WWDC demo they're able to do it as shown below:

推荐答案

上下文菜单包含两部分:预览和菜单.两者都是可选的. Apple屏幕快照中的杂货"是预览，而不是菜单.默认情况下，将对单元进行快照，并且快照将显示为预览. Apple屏幕快照中的菜单本身没有图像，也没有标题.那也是您应该做的！最后一行

A context menu has two parts: the preview and the menu. Both are optional. The "groceries" thing in the Apple screenshot is the preview, not the menu. By default, the cell is snapshotted and the snapshot is displayed as the preview. The menu itself in the Apple screenshot has no image and no title. And that's what you should do too! The last line

return UIMenu(...

...应该没有标题，也没有图像.此菜单是包装所有其他内容并返回的菜单，它是顶层菜单，并且显示方式有所不同(如您自己的屏幕快照所示).没有标题，它看起来最好，并且根本无法显示图像.它的工作是包装其他所有东西并提供一个标识符，仅此而已.

...should have no title and no image. This menu, the one that wraps everything else and is returned, is the top-level menu, and it is displayed differently (as your own screenshot shows). It looks best without a title, and it cannot display an image at all. Its job is to wrap everything else and to provide an identifier, and that's all.

然后您将得到类似这样的内容:

You will then get something like this:

这篇关于iOS 13-UIMenu是否存在不显示其图像的错误?的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！