hekevintran hekevintran - 1 year ago 63
Objective-C Question

Move focus to newly added record in an NSTableView

I am writing an application using Core Data to control a few NSTableViews. I have an add button that makes a new a record in the NSTableView. How do I make the focus move to the new record when this button is clicked so that I can immediately type its name? This is the same idea in iTunes where immediately after clicking the add playlist button the keyboard focus is moved to the new line so you can type the playlist's name.

Answer Source

Okay well first of all, if you haven't already got one, you need to create a controller class for your application. Add an outlet for the NSArrayController that your objects are stored in, and an outlet for the NSTableView that displays your objects, in the interface of your controller class.

IBOutlet NSArrayController *arrayController;
IBOutlet NSTableView *tableView;

Connect these outlets to the NSArrayController and the NSTableView in IB. Then you need to create an IBAction method that is called when your "Add" button is pressed; call it addButtonPressed: or something similar, declaring it in your controller class interface:

- (IBAction)addButtonPressed:(id)sender;

and also making it the target of your "Add" button in IB.

Now you need to implement this action in your controller class's implementation; this code assumes that the objects you have added to your array controller are NSStrings; if they are not, then replace the type of the new variable to whatever object type you are adding.

//Code is an adaptation of an excerpt from "Cocoa Programming for
//Mac OS X" by Aaron Hillegass
- (IBAction)addButtonPressed:(id)sender
//Try to end any editing that is taking place in the table view
NSWindow *w = [tableView window];
BOOL endEdit = [w makeFirstResponder:w];

//Create a new object to add to your NSTableView; replace NSString with
//whatever type the objects in your array controller are
NSString *new = [arrayController newObject];

//Add the object to your array controller
[arrayController addObject:new];
[new release];

//Rearrange the objects if there is a sort on any of the columns
[arrayController rearrangeObjects];

//Retrieve an array of the objects in your array controller and calculate
//which row your new object is in
NSArray *array = [arrayController arrangedObjects];
NSUInteger row = [array indexOfObjectIdenticalTo:new];

//Begin editing of the cell containing the new object
[tableView editColumn:0 row:row withEvent:nil select:YES];

This will then be called when you click the "Add" button, and the cell in the first column of the new row will start to be edited.