Question

I have solved the problem with including terminating method.

If(indexes==0){
endUp = YES;
}

Thanks for pointing me the right direction. It wasn’t problem of the shuffle.
Alessign

Answer 1

the error may be in the loop you use to shuffle the first array.
You don’t post that part of your code…is it something like this?

for (int i=0; i<[indexes count]; i++){
// (...)
        [indexes removeObjectAtIndex:index]; 
// (...)
}

this may be better:

int arrayCount = [indexes count];
for (int i=0; i<arrayCount; i++){
// (...)
        [indexes removeObjectAtIndex:index]; 
// (...)
}

this complete code works well, with no errors or crashes:

int length = 10; 
NSMutableArray* indexes = [[NSMutableArray alloc] initWithCapacity:length];

for (int i=0; i<10; i++) [indexes addObject:[NSNumber numberWithInt:i]];
NSMutableArray*shuffle = [[NSMutableArray alloc] initWithCapacity:length];


int arrayCount = [indexes count];
for (int i=0; i<arrayCount; i++){

    int index = arc4random()%[indexes count];
    NSLog(@"___index: %i", index);
    NSLog(@"indexes: %@ ", indexes);

    [shuffle addObject:[indexes objectAtIndex:index]];
    [indexes removeObjectAtIndex:index]; 
    NSLog(@"shuffle: %@ ", shuffle);
}


for (int i=0; i<[shuffle count]; i++){
    int questionNumber = [[shuffle objectAtIndex:i] intValue] + 1; 
    NSLog(@"questionNumber: %i ", questionNumber);

}