How to show a custom UIMenuItem for a UITableViewCell? How to show a custom UIMenuItem for a UITableViewCell? ios ios

How to show a custom UIMenuItem for a UITableViewCell?


As far as I understand there are two main problems:

1) you expect tableView canPerformAction: to support custom selectors while the documentation says it supports only two of UIResponderStandardEditActions (copy and/or paste);

2) there's no need for the part || action == @selector(test:) as you are adding the custom menu options by initializing menuItems property. For this items selectors the check will be automatical.

What you can do to get the custom menu item displayed and work is:

1) Fix the table view delegate methods with

a)

UIMenuItem *testMenuItem = [[UIMenuItem alloc] initWithTitle:@"Test" action:@selector(test:)];[[UIMenuController sharedMenuController] setMenuItems: @[testMenuItem]];[[UIMenuController sharedMenuController] update];

b)

- (BOOL)tableView:(UITableView *)tableView shouldShowMenuForRowAtIndexPath:(NSIndexPath *)indexPath {    return YES;}-(BOOL)tableView:(UITableView *)tableView canPerformAction:(SEL)action forRowAtIndexPath:(NSIndexPath *)indexPath withSender:(id)sender {    return (action == @selector(copy:));}- (void)tableView:(UITableView *)tableView performAction:(SEL)action forRowAtIndexPath:(NSIndexPath *)indexPath withSender:(id)sender {    // required}

2) Setup the cells (subclassing UITableViewCell) with

-(BOOL) canPerformAction:(SEL)action withSender:(id)sender {    return (action == @selector(copy:) || action == @selector(test:));}-(BOOL)canBecomeFirstResponder {    return YES;}/// this methods will be called for the cell menu items-(void) test: (id) sender {}-(void) copy:(id)sender {}///////////////////////////////////////////////////////


To implement copy and a custom action for UITableViewCell:

Once in your application, register the custom action:

struct Token { static var token: dispatch_once_t = 0 }dispatch_once(&Token.token) {    let customMenuItem = UIMenuItem(title: "Custom", action: #selector(MyCell.customMenuItemTapped(_:))    UIMenuController.sharedMenuController().menuItems = [customMenuItem]    UIMenuController.sharedMenuController().update()}

In your UITableViewCell subclass, implement the custom method:

func customMenuItemTapped(sender: UIMenuController) {    // implement custom action here}

In your UITableViewDelegate, implement the following methods:

override func tableView(tableView: UITableView, shouldShowMenuForRowAtIndexPath indexPath: NSIndexPath) -> Bool {    return true}override func tableView(tableView: UITableView, canPerformAction action: Selector, forRowAtIndexPath indexPath: NSIndexPath, withSender sender: AnyObject?) -> Bool {    return action == #selector(NSObject.copy(_:)) || action == #selector(MyCell.customMenuItemTapped(_:))}override func tableView(tableView: UITableView, performAction action: Selector, forRowAtIndexPath indexPath: NSIndexPath, withSender sender: AnyObject?) {    switch action {    case #selector(NSObject.copy(_:)):        // implement copy here    default:        assertionFailure()    }}

Notes:


Example allowing copy only row 0 of section 0

Updated to Swift 5.2

func shouldAllowCopyOn(indexPath: IndexPath) -> Bool {    if indexPath.section == 0 && indexPath.row == 0 {       return true    }    return false}func tableView(_ tableView: UITableView, shouldShowMenuForRowAt indexPath: IndexPath) -> Bool {    return self.shouldAllowCopyOn(indexPath: indexPath)}func tableView(_ tableView: UITableView, canPerformAction action: Selector, forRowAt indexPath: IndexPath, withSender sender: Any?) -> Bool {    if (action == #selector(UIResponderStandardEditActions.copy(_:))) {          return self.shouldAllowCopyOn(indexPath: indexPath)    }}func tableView(_ tableView: UITableView, performAction action: Selector, forRowAt indexPath: IndexPath, withSender sender: Any?) {    if (action == #selector(UIResponderStandardEditActions.copy(_:)) && self.shouldAllowCopyOn(indexPath: indexPath)) {       if let cell = self.tableView.cellForRow(at: indexPath) as? UITableViewCell {         self.copyAction(cell: cell)        }    }}@objcprivate func copyAction(cell: UITableViewCell) {    UIPasteboard.general.string = cell.titleLabel.text}


matomo