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copied!<p>Adding more basic information to @JimPuls answer for the benefit of other newcomers to Cocoa.</p> <ol> <li>An IBOutlet to the NSTableView needs to be declared in an interface. I assumed it is preferred to do so in the table's delegate.</li> <li>The IBOutlet to the table needs to be connected via Interface Builder. To do that Ctrl-Drag & Drop in IB from the class that declares the outlet to the table view. When you release your mouse a popup should appear with the name of the outlet you declared in step #1. Select that.</li> <li>In the @implementation section, on the -awakeFromNib method, call -setTarget: and -setDoubleAction: on the IBOutlet declared in step #1 and connected in step #2.</li> </ol> <p>Here's an excerpt from my table view delegate. I have my delegate also set up as the datasource, so that's why you'll see both the NSTableViewDelegate and NSTabeViewDataSource interfaces associated with it.</p> <p>// Interface excerpt.</p> <pre><code>@interface MyTableViewDelegate : NSObject <NSTableViewDelegate, NSTableViewDataSource> { // This iVar needs to be connected to the table view via the IB. IBOutlet NSTableView *tableOutlet; } @property (assign) IBOutlet NSTableView *tableOutlet; - (void)doubleClick:(id)nid; @end </code></pre> <p>// Implementation excerpt.</p> <pre><code>@implementation MyTableViewDelegate @synthesize tableOutlet = _tableOutlet; - (void)awakeFromNib { [_tableOutlet setTarget:self]; [_tableOutlet setDoubleAction:@selector(doubleClick:)]; } - (void)doubleClick:(id)object { // This gets called after following steps 1-3. NSInteger rowNumber = [_tableOutlet clickedRow]; // Do something... } </code></pre> <p>Hope this helps.</p>

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