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Making a copy of an Array

referenceArray = [NSMutableArray arrayWithCapacity:numberOfStems];

    referenceArray = [[NSMutableArray alloc] init];

 

    stemArray =  [NSMutableArray arrayWithCapacity:numberOfStems];

    stemArray =  [[NSMutableArray alloc] init];

 

for ( int i = 1; i <= numStems; i++ ) {

    NSString *soundName = [NSString stringWithFormat:@"stem-%i", i];

    NSString *soundPath = [[NSBundle mainBundle] pathForResource:soundName ofType:@"mp3"];

    NSURL *soundFile = [[NSURL alloc] initFileURLWithPath:soundPath];  

    [referenceArray addObject:soundFile];

}

       

referenceArray = [NSMutableArray arrayWithCapacity:numberOfStems];

 

for ( int i = 1; i <= numStems; i++ ) {

    // Fill in referenceArray

}

 

stemArray = [referenceArray copy];

       

// You are making a new mutable array that has a starting capacity of numberOfStems and assigning it to the referenceArray variable

referenceArray = [NSMutableArray arrayWithCapacity:numberOfStems];

 

// You then create another new mutable array with the default capacity and re-assign the referenceArray variable.  Fortunately, the first array was created with -arrayWithCapacity: instead of -init...; thus, you aren't leaking an object

referenceArray = [[NSMutableArray alloc] init];

 

// Same as above

stemArray =  [NSMutableArray arrayWithCapacity:numberOfStems];

stemArray =  [[NSMutableArray alloc] init];

 

for ( int i = 1; i <= numStems; i++ ) {

    // This part looks fine

    NSString *soundName = [NSString stringWithFormat:@"stem-%i", i];

    NSString *soundPath = [[NSBundle mainBundle] pathForResource:soundName ofType:@"mp3"];

    NSURL *soundFile = [[NSURL alloc] initFileURLWithPath:soundPath];  

    [referenceArray addObject:soundFile];

 

    // If you are in ARC, you are fine.  If non-ARC, you are leaking soundFile and need to do:

    // [soundFile release];

}

       

stemArray = [referenceArray mutableCopy];  // If stemArray is defined as an NSMutableArray

       

stemArray = [referenceArray copy];  // If stemArray is defined as an NSArray