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POarrayController "valueForUndefinedKey": why it gets istantiated immediately?
 

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  1. POarrayController "valueForUndefinedKey": why it gets istantiated immediately?
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    <p>My application has 2 windows, both of them are displaying NSScrollView objects managed by a controller. Basically the first has the data, the second has a proper aggregation of the data. Both are relying of an implementation of NSArrayController class.</p> <p>I designed both windows properly (I believe so at least) but I keep getting this error:</p> <pre><code> [&lt;MyDocument 0x1020257c0&gt; valueForUndefinedKey:]: this class is not key value coding-compliant for the key &lt;MY_ARRAY&gt;. </code></pre> <p>The only way I managed to solve this was to instantiate immediately (I mean when the first window gets prepared) the second array and populate it with some values this way:</p> <pre><code>NSMutableArray *newAggregates = [NSMutableArray array]; [newAggregates addObject: [NSMutableDictionary dictionaryWithObjectsAndKeys: [NSString stringWithString:@"category"], @"category", [NSString stringWithString:@"subcategory"], @"subcategory", [NSNumber numberWithFloat:0.0], @"amount_1", [NSNumber numberWithFloat:0.0], @"amount_2", [NSNumber numberWithFloat:0.0], @"amount_3", [NSNumber numberWithFloat:0.0], @"amount_4", [NSNumber numberWithFloat:0.0], @"amount_5", [NSNumber numberWithFloat:0.0], @"amount_6", [NSNumber numberWithFloat:0.0], @"amount_7", [NSNumber numberWithFloat:0.0], @"amount_8", [NSNumber numberWithFloat:0.0], @"amount_9", [NSNumber numberWithFloat:0.0], @"amount_10", [NSNumber numberWithFloat:0.0], @"amount_11", [NSNumber numberWithFloat:0.0], @"amount_12", [NSNumber numberWithFloat:0.0], @"total", nil]]; [self setAggregates:newAggregates]; </code></pre> <p>This works, but it is not what I wanted, I want the second array to be executed only optionally, if and only if the user presses a certain button.</p> <p>Is there a way to accomplish that, or any array controller present in the application has to be instantiated at the beginning? I am absolutely sure there must be a way to avoid that...</p>
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    1. USFabrizio Prosperi
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