带有自定义项目的 UIMenuController 不适用于 UICollectionview

Question

我在 UICollectionViewCell 上长按时添加了自定义菜单控制器

    [self becomeFirstResponder];
    UIMenuItem *menuItem = [[UIMenuItem alloc] initWithTitle:@"Custom Action"
                                                      action:@selector(customAction:)];
    [[UIMenuController sharedMenuController] setMenuItems:[NSArray arrayWithObject:menuItem]];
    [[UIMenuController sharedMenuController] setTargetRect: self.frame inView:self.superview];
    [[UIMenuController sharedMenuController] setMenuVisible:YES animated: YES];

canBecomeFirstResponder 也被调用

- (BOOL)canBecomeFirstResponder {
    // NOTE: This menu item will not show if this is not YES!
    return YES;
}

//这个方法没有被调用

- (BOOL)canPerformAction:(SEL)action withSender:(id)sender {
    NSLog(@"canPerformAction");
    // The selector(s) should match your UIMenuItem selector
    if (action == @selector(customAction:)) {
        return YES;
    }
    return NO;
}

我也实现了这些方法

- (BOOL)collectionView:(UICollectionView *)collectionView
      canPerformAction:(SEL)action
    forItemAtIndexPath:(NSIndexPath *)indexPath
            withSender:(id)sender {


    if([NSStringFromSelector(action) isEqualToString:@"customAction:"]){
        NSLog(@"indexpath : %@",indexPath);
        UIAlertView *alertview = [[UIAlertView alloc] initWithTitle:@"warning.." message:@"Do you really want to delete this photo?" delegate:nil cancelButtonTitle:@"Ok" otherButtonTitles:nil, nil];
        [alertview show];
        return YES;
    }

    return YES;

}

- (BOOL)collectionView:(UICollectionView *)collectionView shouldShowMenuForItemAtIndexPath:(NSIndexPath *)indexPath {
    return YES;
}

- (void)collectionView:(UICollectionView *)collectionView
         performAction:(SEL)action
    forItemAtIndexPath:(NSIndexPath *)indexPath
            withSender:(id)sender {
    NSLog(@"performAction");
}

虽然它只显示“剪切、复制和粘贴”菜单

Answer 1

可能有点晚了，但我可能为那些仍在寻找这个的人找到了更好的解决方案：

在 UICollectionViewController 的 viewDidLoad 中添加您的项目：

UIMenuItem *menuItem = [[UIMenuItem alloc] initWithTitle:@"Title" action:@selector(action:)];
[[UIMenuController sharedMenuController] setMenuItems:[NSArray arrayWithObject:menuItem]];

添加以下委托方法：

//This method is called instead of canPerformAction for each action (copy, cut and paste too)
- (BOOL)collectionView:(UICollectionView *)collectionView canPerformAction:(SEL)action forItemAtIndexPath:(NSIndexPath *)indexPath withSender:(id)sender {
        if (action == @selector(action:)) {
            return YES;
        }
        return NO;
    }
    //Yes for showing menu in general
    - (BOOL)collectionView:(UICollectionView *)collectionView shouldShowMenuForItemAtIndexPath:(NSIndexPath *)indexPath {
        return YES;
    }

子类 UICollectionViewCell 如果你还没有。添加您为项目指定的方法：

- (void)action:(UIMenuController*)menuController {

}

这样你就不需要任何 becomeFirstResponder 或其他方法。您可以将所有操作集中在一个地方，如果您以单元格本身作为参数调用通用方法，则可以轻松处理不同的单元格。

编辑：uicollectionview 不知何故需要此方法的存在（您的自定义操作不会调用此方法，我认为 uicollectionview 只是检查是否存在）

- (void)collectionView:(UICollectionView *)collectionView performAction:(SEL)action forItemAtIndexPath:(NSIndexPath *)indexPath withSender:(id)sender {

}

Answer 2

您需要从自定义 UICollectionViewCell 触发委托函数

这是我的 Swift3 工作示例代码

CollectionViewController

override func viewDidLoad() {
    super.viewDidLoad()
    let editMenuItem = UIMenuItem(title: "Edit", action: NSSelectorFromString("editCollection"))
    let deleteMenuItem = UIMenuItem(title: "Delete", action: NSSelectorFromString("deleteCollection"))
    UIMenuController.shared.menuItems = [editMenuItem, deleteMenuItem]

}

override func collectionView(_ collectionView: UICollectionView, shouldShowMenuForItemAt indexPath: IndexPath) -> Bool {
    return true
}

override func collectionView(_ collectionView: UICollectionView, canPerformAction action: Selector, forItemAt indexPath: IndexPath, withSender sender: Any?) -> Bool {
    return action == NSSelectorFromString("editCollection") || action == NSSelectorFromString("deleteCollection")
}

override func collectionView(_ collectionView: UICollectionView, performAction action: Selector, forItemAt indexPath: IndexPath, withSender sender: Any?) {
    print("action:\(action.description)")
    //Custom actions here..
}

将以下函数添加到您的自定义 UICollectionViewCell

override func canPerformAction(_ action: Selector, withSender sender: Any?) -> Bool {
    return action == NSSelectorFromString("editCollection") || action == NSSelectorFromString("deleteCollection")
}

从单元格调用委托函数（需要在您的自定义 UICollectionViewCell 中）

func editCollection()
{
    let collectionView = self.superview as! UICollectionView
    let d:UICollectionViewDelegate = collectionView.delegate!
    d.collectionView!(collectionView, performAction: NSSelectorFromString("editCollection"), forItemAt: collectionView.indexPath(for: self)!, withSender: self)
}
func deleteCollection()
{
    let collectionView = self.superview as! UICollectionView
    let d:UICollectionViewDelegate = collectionView.delegate!
    d.collectionView!(collectionView, performAction: NSSelectorFromString("deleteCollection"), forItemAt: collectionView.indexPath(for: self)!, withSender: self)
}

Answer 3

我刚刚花了两天时间试图找出“正确”的做法，并用周围的一些建议找出错误的树。

这篇文章展示了正确的做法。我希望通过在这里发布它可以节省几个小时。

http://dev.glide.me/2013/05/custom-item-in-uimenucontroller-of.html

Answer 4

Swift 3 解决方案：

只需在 UICollectionView 类中执行所有操作，并将该类分配给 UICollectionView 对象。

import UIKit

class MyAppCollectionView: UICollectionView {

    required public init?(coder aDecoder: NSCoder) {
        super.init(coder: aDecoder)

        addLongPressGesture()
    }

    func addLongPressGesture() {
        let longPressGesture = UILongPressGestureRecognizer(target: self, action: #selector(MyAppCollectionView.longPressed(_:)))
        longPressGesture.minimumPressDuration = 0.5
        self.addGestureRecognizer(longPressGesture)
    }

    func longPressed(_ gesture: UILongPressGestureRecognizer) {

        let point = gesture.location(in: self)
        let indexPath = self.indexPathForItem(at: point)

        if indexPath != nil {

            MyAppViewController.cellIndex = indexPath!.row
            let editMenu = UIMenuController.shared
            becomeFirstResponder()
            let custom1Item = UIMenuItem(title: "Custom1", action: #selector(MyAppViewController.custome1Method))
            let custom2Item = UIMenuItem(title: "Custom2", action: #selector(MyAppViewController.custome2Method))
            editMenu.menuItems = [custom1Item, custom2Item]
            editMenu.setTargetRect(CGRect(x: point.x, y: point.y, width: 20, height: 20), in: self)
            editMenu.setMenuVisible(true, animated: true)
        }

    }

    override var canBecomeFirstResponder: Bool {

        return true
    }
}

class MyAppViewController: UIViewController {

     override func canPerformAction(_ action: Selector, withSender sender: Any?) -> Bool {
            // You need to only return true for the actions you want, otherwise you get the whole range of
            //  iOS actions. You can see this by just removing the if statement here.

            //For folder edit
            if action == #selector(MyAppViewController.custome1Method) {
                return true
            }

            if action == #selector(MyAppViewController.custome2Method) {
                return true
            }

            return false
        }
}

Answer 5

当人们无法让菜单在集合视图（或表格视图，就此而言）中长按时工作时，总是出于以下两个原因之一：

• 您正在使用长按手势识别器进行某些操作。例如，您不能在同一个集合视图中同时拥有拖动和菜单。

• 您忘记在单元格中实现选择器。

例如，OP的代码说：

UIMenuItem *menuItem = [[UIMenuItem alloc] initWithTitle:@"Custom Action"
                                           action:@selector(customAction:)];

暗示customAction是一个方法this类。这是错误。 customAction: 必须是 cell 类的方法。原因是运行时会查看单元类，除非单元实现菜单项的操作方法，否则不会显示菜单项。

有关完整的最小工作示例（在 Swift 中），请在此处查看我的答案：https://stackoverflow.com/a/51898182/341994

Answer 6

在带有 Swift 的 iOS 9 上仅显示自定义项目（没有默认剪切、粘贴等），我只设法使用以下代码。

关于方法viewDidLoad：

let longPressRecognizer = UILongPressGestureRecognizer(target: self, action: #selector(contextMenuHandler))
longPressRecognizer.minimumPressDuration = 0.3
longPressRecognizer.delaysTouchesBegan = true
self.collectionView?.addGestureRecognizer(longPressRecognizer)

覆盖方法canBecomeFirstResponder：

override func canBecomeFirstResponder() -> Bool {
    return true
}

重写这两个集合相关的方法：

override func collectionView(collectionView: UICollectionView, shouldShowMenuForItemAtIndexPath indexPath: NSIndexPath) -> Bool {
    return true
}

override func collectionView(collectionView: UICollectionView, canPerformAction action: Selector,
                             forItemAtIndexPath indexPath: NSIndexPath, withSender sender: AnyObject?) -> Bool {
    return (action == #selector(send) || action == #selector(delete))
}

创建手势处理方法：

func contextMenuHandler(gesture: UILongPressGestureRecognizer) {

    if gesture.state == UIGestureRecognizerState.Began {

        let indexPath = self.collectionView?.indexPathForItemAtPoint(gesture.locationInView(self.collectionView))

        if indexPath != nil {

            self.selectedIndexPath = indexPath!

            let cell = self.collectionView?.cellForItemAtIndexPath(self.selectedIndexPath)
            let menu = UIMenuController.sharedMenuController()
            let sendMenuItem = UIMenuItem(title: "Send", action: #selector(send))
            let deleteMenuItem = UIMenuItem(title: "Delete", action: #selector(delete))
            menu.setTargetRect(CGRectMake(0, 5, 60, 80), inView: (cell?.contentView)!)
            menu.menuItems = [sendMenuItem, deleteMenuItem]
            menu.setMenuVisible(true, animated: true)
        }
    }
}

最后，创建选择器的方法：

func send() {
    print("Send performed!")
}

func delete() {
    print("Delete performed!")
}

希望对您有所帮助。 :)

干杯。