在 swift 中更改 UImenu 的位置

Question

我想在我的应用程序中添加一个 UIMenu，我正在练习它，现在想知道是否可以将 UIMenu 的位置设置得比当前显示的按钮高一点：

正如您在这张照片中看到的，菜单当前覆盖了标签栏，我想将其设置得比标签栏高一点。这是我的代码：

let menu = UIMenu(title: "", children: [
  UIAction(title: NSLocalizedString("Gallery", comment: ""), image: UIImage(systemName: "folder"), handler: {
    (_) in
    self.loadPhotoGallery()
  })
])

btnMenuExtras.menu = menu

Answer 1

iOS 14+

Sinse iOS 14 UIControl 有提供附加菜单点的方法

/// Return a point in this control's coordinate space to which to attach the given configuration's menu.
@available(iOS 14.0, *)
open func menuAttachmentPoint(for configuration: UIContextMenuConfiguration) -> CGPoint

因此您可以覆盖 UIButton 以提供菜单（计算或硬编码）相对于按钮本身的所需位置（`因为它在按钮的坐标 space 中）并使用该按钮在情节提要中（作为 class 用于控制）或以编程方式创建（如果您需要将其注入某处）：

class MyButton: UIButton {
    var offset = CGPoint.zero
    override func menuAttachmentPoint(for configuration: UIContextMenuConfiguration) -> CGPoint {
        // hardcoded variant
//      return CGPoint(x: 0, y: -50)

        // or relative to orginal
        let original = super.menuAttachmentPoint(for: configuration)
        return CGPoint(x: original.x + offset.x, y: original.y + offset.y)
    }
}

class ViewController: UIViewController {

    @IBOutlet weak var btnMenuExtras: MyButton!   // << from storyboard

    override func viewDidLoad() {
        super.viewDidLoad()

        let menu = UIMenu(title: "", children: [
            UIAction(title: NSLocalizedString("Gallery", comment: ""), image: UIImage(systemName: "folder"), handler: {
                (_) in
//              self.loadPhotoGallery()
            })
        ])

        // offset is hardcoded for demo simplicity
        btnMenuExtras.offset = CGPoint(x: 0, y: -50)    // << here !!
        btnMenuExtras.menu = menu
    }
}

结果：

使用 Xcode 13 / iOS 15

准备和测试的演示

backup

Answer 2

您可以使用 UIButton 的 UIControl 的 menuAttachmentPoint 方法来定位菜单并将该 UIButton 转换为 UIBarButtonItem 通过使用波纹管扩展

@available(iOS 14.0, *)
open func menuAttachmentPoint(for configuration: UIContextMenuConfiguration) -> CGPoint

extension UIButton {
  func toBarButtonItem() -> UIBarButtonItem? {
     return UIBarButtonItem(customView: self)
  }
}

Answer 3

我想扩展@Asperi 和@Jayesh Patel 的回答，关于我们如何在 UIBarButtonItem

上应用该技术

//
// Technique provided by @Asperi
//
class MyButton: UIButton {
    var offset = CGPoint.zero
    override func menuAttachmentPoint(for configuration: UIContextMenuConfiguration) -> CGPoint {
        // hardcoded variant
//      return CGPoint(x: 0, y: -50)

        // or relative to orginal
        let original = super.menuAttachmentPoint(for: configuration)
        return CGPoint(x: original.x + offset.x, y: original.y + offset.y)
    }
}

let image = UIImage(systemName: "ellipsis.circle", withConfiguration: UIImage.SymbolConfiguration(scale: .default))
let button = MyButton()
button.setImage(image, for: .normal)

let menu = UIMenu(title: "", children: [
    UIAction(title: NSLocalizedString("Gallery", comment: ""), image: UIImage(systemName: "folder"), handler: {
        (_) in
    })
])
// offset is hardcoded for demo simplicity
button.offset = CGPoint(x: 0, y: 50)    // << here !!

//
// This is how we can make UIButton as UIBarButtonItem
//
button.menu = menu
button.showsMenuAsPrimaryAction = true

//
// Technique provided by @Jayesh Patel
//
let threeDotsBarButtonItem = UIBarButtonItem(customView: button)
var items = toolbar.items
items?.append(threeDotsBarButtonItem)
toolbar.items = items

在 swift 中更改 UImenu 的位置

Change the location of an UImenu in swift

uikit

ios

swift

uimenu