get values form NSMutableArray from end to start

Question

I want to take the values from NSMutableArray but want to read from last index to 1st index

thank you

Have you tried for ( int i = [array count]-1; i>=0; i--) ? — Joseph Lin
– Joseph Lin, Commented Apr 27, 2011 at 15:58
Otherwise, try one of these: – sortedArrayUsingDescriptors: – sortedArrayUsingSelector: – sortedArrayUsingComparator: — Joseph Lin
– Joseph Lin, Commented Apr 27, 2011 at 16:00

MarkPowell · Accepted Answer · 2011-04-27 15:56:15Z

5

for (id someObject in [someArray reverseObjectEnumerator])
{
    //do your thing
}

answered Apr 27, 2011 at 15:56

MarkPowell

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Vladimir · Accepted Answer · 2011-04-27 16:00:37Z

2

2 other options:

Simple for-loop (surely not recommended):

for (int i = [array count]-1; i >= 0; ++i)
    id value = [array objectAtIndex: i];

Block-based enumeration:

[array enumerateObjectsWithOptions: NSEnumerationReverse
                        usingBlock: ^(id obj, NSUInteger idx, BOOL *stop){
                              //do something
                        }];

answered Apr 27, 2011 at 16:00

Vladimir

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justin · Accepted Answer · 2011-04-27 16:01:13Z

1

Mark's answer is useful, but this form may be useful when you want to mutate the array:

while ([arr count]) {
  id obj  = [arr lastObject];
  // use obj
  [arr removeLastObject];
}

answered Apr 27, 2011 at 16:01

justin

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