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PONSArray to NSMutableArray as random stack
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  1. PONSArray to NSMutableArray as random stack
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    copied!<p>Just a conceptual description first:</p> <p>I am reading input from a text file (a list of words) and putting these words into an <code>NSArray</code> using <code>componentsSeparatedByString</code> method. This works.</p> <p>But I wanted to select the words randomly and then delete them from the array so as to ensure a different word each time. Of course, you cannot change the <code>NSArray</code> contents. So...</p> <p>I copied the contents of the <code>NSArray</code> into an <code>NSMutableArray</code> and use IT for the selection source. This also works - 269 objects in each array.</p> <p>To return a word from the <code>NSMutableArray</code> I use the following code: note- the arrays are declared globally as</p> <pre><code>arrMutTextWords = [[NSMutableArray alloc] init]; //stack for words arrTextWords = [[NSArray alloc] init]; //permanent store for words -(NSString*) getaTextWord { // if the mutable text word array is empty refill if ([arrMutTextWords count] == 0){ for (int i = 0 ; i &lt; [arrTextWords count]; i++) [arrMutTextWords addObject:[arrTextWords objectAtIndex:i]]; } int i = random() % [arrMutTextWords count]; NSString* ptrWord = [arrMutTextWords objectAtIndex:i]; [arrMutTextWords removeObjectAtIndex:i]; return ptrWord; </code></pre> <p>}</p> <p>The program crashes during a call to the method above - here is the calling code: arrTmp is declared globally arrTmp = [[NSArray alloc] init]; //tmp store for words</p> <pre><code>for (int i = 0 ; i &lt; 4; i++) { tmpWord = [self getaTextWord]; [arrTmp addObject:tmpWord]; [arrTmp addObject:tmpWord]; } </code></pre> <p>I'm thinking that somehow deleting strings from <code>arrMutTextWords</code> is invalidating the <code>NSArray</code> - but I can't think how this would occur.</p>
 

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