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copied!<p>If you're used to bindings, then I'd recommend looking at NSValueTransformer; specifically, creating a subclass of that which converts a priority value to a string of exclamation marks. You'd then simply provide the name (the same one used in <code>+setValueTransformer:forName:</code>) as the 'value transformer' attribute in your bindings.</p> <p>For instance, the code would look like so:</p> <pre><code>@interface PriorityTransformer : NSValueTransformer @end @implementation PriorityTransformer + (Class) transformedValueClass { return ( [NSString class] ); } + (BOOL) allowsReverseTransformation { return ( NO ); } - (id) transformedValue: (id) value { // this makes the string creation a bit simpler static unichar chars[MAX_PRIORITY_VALUE] = { 0 }; if ( chars[0] == 0 ) { // ideally you'd use a spinlock or such to ensure it's setup before // another thread uses it int i; for ( i = 0; i < MAX_PRIORITY_VALUE; i++ ) chars[i] = (unichar) '!'; } return ( [NSString stringWithCharacters: chars length: [value unsignedIntegerValue]] ); } @end </code></pre> <p>You would then put this code into the same file as a central class (such as the application delegate) and register it through that class's <code>+initialize</code> method to ensure it's registered in time for any nibs to find it:</p> <pre><code>+ (void) initialize { // +initialize is called for each class in a hierarchy, so always // make sure you're being called for your *own* class, not some sub- or // super-class which doesn't have its own implementation of this method if ( self != [MyClass class] ) return; PriorityTransformer * obj = [[PriorityTransformer alloc] init]; [NSValueTransformer setValueTransformer: obj forName: @"PriorityTransformer"]; [obj release]; // obj is retained by the transformer lookup table } </code></pre>

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