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PONSTextField continuous update
 

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    <p>I can't figure out how to get an <code>NSTextfield</code> to update automatically, without having to press "Return" or click another text field.</p> <p>My goal is to input a number into a field and have the other fields update simultaneously. I tried clicking "Continuous" in the text field attributes but it doesn't seem to do anything.</p> <p>Here is my interface file:</p> <pre><code>#import &lt;Foundation/Foundation.h&gt; @interface InchController : NSObject { IBOutlet NSTextField *centimetersTextField; IBOutlet NSTextField *inchesTextField; IBOutlet NSTextField *feetTextField; } -(IBAction)convert:(id)sender; @end </code></pre> <p>Here is my implementation file:</p> <pre><code>#import "InchController.h" @implementation InchController - (IBAction)convert:(id)sender { if (sender == inchesTextField) { float inches = [inchesTextField floatValue]; [feetTextField setFloatValue:(inches * 0.0833)]; [centimetersTextField setFloatValue:(inches * 2.54)]; } else if (sender == feetTextField) { float feet = [feetTextField floatValue]; [inchesTextField setFloatValue:(feet * 12)]; [centimetersTextField setFloatValue:(feet * 30.48)]; } else if (sender == centimetersTextField) { float centimeters = [centimetersTextField floatValue]; [inchesTextField setFloatValue:(centimeters * 0.394)]; [feetTextField setFloatValue:(centimeters * 0.033)]; } } @end </code></pre> <p>So here is the updated implementation file per Josh's solution. Commented out the IBAction since it is no longer needed in the implementation and interface files.</p> <pre><code>#import "LengthController.h" @implementation LengthController //- (IBAction) convert: (id)sender { //} -(void) controlTextDidChange:(NSNotification *) note { NSTextField *changedField = [note object]; if (changedField == inchesTextField) { float inches = [inchesTextField floatValue]; [feetTextField setFloatValue: (inches * 0.0833)]; [centimetersTextField setFloatValue: (inches * 2.54)]; } if (changedField == centimetersTextField) { float centimeters = [centimetersTextField floatValue]; [inchesTextField setFloatValue:(centimeters * 0.394)]; [feetTextField setFloatValue:(centimeters * 0.033)]; } if (changedField == feetTextField) { float feet = [feetTextField floatValue]; [inchesTextField setFloatValue:(feet * 12)]; [centimetersTextField setFloatValue:(feet * 30.48)]; } } @end </code></pre>
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    1. COpossible duplicate of [Listen to a value change of my text field](http://stackoverflow.com/questions/6164471/listen-to-a-value-change-of-my-text-field)
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      1. USJosh Caswell
 

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