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copied!<p>To allow the run loop to run between messages, use an <code>NSTimer</code> or delayed perform. Here's the latter:</p> <pre><code>- (IBAction) start:(id)sender { [self performSelector:@selector(updateTextFieldWithNumber:) withObject:[NSNumber numberWithInt:0] afterDelay:1.0]; } - (void) updateTextFieldWithNumber:(NSNumber *)num { int i = [num intValue]; [outputField setIntValue:i]; if (i < 10) [self performSelector:@selector(updateTextFieldWithNumber:) withObject:[NSNumber numberWithInt:++i] afterDelay:1.0]; } </code></pre> <p>Here's one timer-based solution. You may find it easier to follow. You could set the text field's value from the text field:</p> <pre><code>@interface TestNums: NSObject { IBOutlet NSTextField *outputField; NSTimer *timer; int currentNumber; } @end @implementation TestNums - (IBAction) start:(id)sender { timer = [[NSTimer scheduledTimerWithTimeInterval:1.0 target:self selector:@selector(updateTextField:) userInfo:nil repeats:YES] retain]; //Set the field's value immediately to 0 currentNumber = 0; [outputField setIntValue:currentNumber]; } - (void) updateTextField:(NSTimer *)timer { [outputField setIntValue:++currentNumber]; } @end </code></pre> <p>Here's an even better (cleaner) timer-based solution, using a property. You'll need to bind the text field to the property in Interface Builder (select the field, press ⌘4, choose your object, and enter <code>currentNumber</code> as the key to bind to).</p> <pre><code>@interface TestNums: NSObject { //NOTE: No outlet this time. NSTimer *timer; int currentNumber; } @property int currentNumber; @end @implementation TestNums @synthesize currentNumber; - (IBAction) start:(id)sender { timer = [[NSTimer scheduledTimerWithTimeInterval:1.0 target:self selector:@selector(updateTextField:) userInfo:nil repeats:YES] retain]; //Set the field's value immediately to 0 self.currentNumber = 0; } - (void) updateTextField:(NSTimer *)timer { self.currentNumber = ++currentNumber; } @end </code></pre> <p>The property-based solution has at least two advantages:</p> <ol> <li>Your object doesn't need to know about the text field. (It is a model object, separate from the view object that is the text field.)</li> <li>To add more text fields, you simply create and bind them in IB. You don't have to add any code to the TestNums class.</li> </ol>

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