StackOverflow2013

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copied!<p>I think you have asked the same question else where. So here is the answer which also applies here.</p> <p>I found a few things that should be changed in your code. Here is what I did to make your swap function work.</p> <p>This is the function:</p> <pre><code>-(void) swapCharacters: (NSMutableString *)set withInteger: (int)first andInteger: (int)second{ NSLog(@"swap: set = '%@', first = '%i', second = '%i'", set, first, second); NSRange rangeSecond = NSMakeRange(second, 1); NSRange rangeFirst = NSMakeRange(first, 1); [set replaceCharactersInRange:rangeSecond withString:[set substringWithRange:rangeFirst]]; NSLog(@"swap: set = '%@', first = '%i', second = '%i'", set, first, second); } </code></pre> <p>This is how the function was called:</p> <pre><code>FooClass *fooObjectVar = [[FooClass alloc] init]; NSMutableString *myString = [[NSMutableString alloc] initWithString:@"Hello"]; [fooObjectVar swapCharacters:myString withInteger:0 andInteger:0]; [fooObjectVar release]; [myString release]; </code></pre> <p>This is the output:</p> <pre><code>2011-12-30 14:19:00.501 StackOverflowHelp[748:903] swap: set = 'Hello', first = '0', second = '0' 2011-12-30 14:19:00.504 StackOverflowHelp[748:903] swap: set = 'Hello', first = '0', second = '0' </code></pre> <p>*Notice that with functions in objective-c, the name is like a description</p> <p>*Instead of using NSInteger, I used a normal int because an NSInteger is not necessary here</p> <p>*When using <strong>NSLog</strong> or string formatting, <strong>%@</strong> is for objects (NSString,NSInteger...), <strong>%i</strong> is for int, <strong>%f</strong> is for float and <strong>%d</strong> is for double</p> <p>I hope that helped, happy coding!</p>

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