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Editorial Team
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Asked: 2026-06-12T16:44:56+00:00

I am calling a method getHoleScore that populates a NSMutableArray and returns it. I’m

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I am calling a method getHoleScore that populates a NSMutableArray and returns it. I’m trying to copy the array so that the calling method can access the items but I get this exception every time:

exception ‘NSRangeException’, reason: ‘* -[__NSArrayM objectAtIndex:]: index 0 beyond bounds for empty array’

I’ve tried multiple different ways of copying an array that I’ve found on this site but nothing seems to work. Here’s the code:

Score *theScore = self.roundScore;
NSMutableArray *scores = [[[self delegate]getHoleScore:self score:theScore] mutableCopy];
NSInteger total = 0;

if (theScore) {
    self.playerName.text = theScore.name;
    self.courseName.text = theScore.course;
    self.hole1Field.text = [NSString stringWithFormat:@"%d", [[scores objectAtIndex:0] integerValue]];
    self.hole2Field.text = [NSString stringWithFormat:@"%d", [[scores objectAtIndex:1] integerValue]];
    self.hole3Field.text = [NSString stringWithFormat:@"%d", [[scores objectAtIndex:2] integerValue]];
    self.hole4Field.text = [NSString stringWithFormat:@"%d", [[scores objectAtIndex:3] integerValue]];
    self.hole5Field.text = [NSString stringWithFormat:@"%d", [[scores objectAtIndex:4] integerValue]];

etc.

Any idea on how to populate the scores array?

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1 Answer

  1. Editorial Team

    You are reaching 0 for your mutable array because it hasn’t been alloc/init yet. you either have to place this NSMutableArray *myscores = [NSMutableArray array]; above you [[self delegate] ] call.

    Or a better way to do this would be creating your myscores and pass the method in with a this built in nsarray super class method, which takes care of alloc/init your array.

    NSMutableArray *myscores =
    [NSMutableArray arrayWithArray:[[self delegate] getHoleScore:self
    score:theScore];

    also make sure that
    [[self delegate]getHoleScore:self score:theScore]is not sending you a empty array, calling a -objectAtIndex:a on a empty array will crash your code. A good way to check if your array is empty or not is calling the method -count method on your array, calling count on a array won’t crash your code, even if it’s zero.

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