NSTableView and backspace event (delete row) - fieldeditor/firstresponder?

Is it possible to make my NSTableView accept a deleteevnt (backspace og even c开发者_Go百科md+backspace) ? I have an NSMenu where i have my delete-menu-item connected to my first responder object in the nib.

Any pointers?

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One approach which is easy to implement:

1. add +/- buttons to your interface in IB and connect them to a deleteRecord IBAction
2. with the delete (-) button selected in IB, navigate to Attributes Inspector > Button > Key Equivalent
3. click in the box to start recording your keypress, then hit the Delete/Backspace key

When you build your project, given that you implement the deleteRecord method, a Backspace keypress will delete records from your tableview

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This is a modern solution using NSViewController and First Responder.

The Delete menu item in the menu Edit is connected to the selector delete: of First Responder. If there is no Delete menu item, create one and connect it to delete: of First Responder (red cube).

• Assign a key equivalent to the Delete menu item (⌫ or ⌘⌫)

• In the view controller implement the IBAction method

  Swift: @IBAction func delete(_ sender: AnyObject)

  Objective-C: -(IBAction)delete:(id)sender

  and put in the logic to delete the table view row(s).

No subclass needed.

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The correct way of implementing this functionality is by using key-bindings:

1. Select the delete menu item in IB and set it's key equivalent to the backspace key for example.
2. Connect the menu items action to a method you wrote for handling the task. This method will be found for you automatically up the responder chain, when you connect it through the first responder.
3. Implement your delete functionality.

Depending upon which kind of application you write, there are validation delegate methods. By which means you can set the menu items enabled state. For a document based application this validation happens through - (BOOL)validateUserInterfaceItem:(id)anItem.

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You could create a subclass of NSTableView, overriding keyDown like so:

- (void)keyDown:(NSEvent *)theEvent
{

    unichar key = [[theEvent charactersIgnoringModifiers] characterAtIndex:0];
    if(key == NSDeleteCharacter) 
    {

        [self deleteItem];
        return;
    }

    [super keyDown:theEvent];

}

Then make sure that any NSTableView that you want to have the delete functionality uses your subclass in Interface Builder instead of the regular NSTableView.

You can implement the - (void)deleteItem method for example like this:

- (void)deleteItem
{
    if ([self numberOfSelectedRows] == 0) return;

    NSUInteger index = [self selectedRow];

    [documentController deleteItemWithIndex:index];

}