How can i make a NSString display a Array Count

Question

I need to display the count of a array in a label. To do that I need to pass the array.count to an NSString. This is what I have tried:

if (myArray.count > 0 ) {
   NSString *newString = @"Array count = %@", myArray.count; 
   [_myLabel setText:newString];
}

It didn't work. I also tried to replace the NSString with an NSMutableString, no results there. So my question is, how do i do that?

I also tried to replace the %@, for %lu, and then add the (unsigned long) before the array count (just like I do to display the array count on a NSlog), but this did not work either.

TotoroTotoro · Accepted Answer · 2013-11-25 21:19:00Z

4

NSString *newString = [NSString stringWithFormat:@"Array count = %d", myArray.count];

answered Nov 25, 2013 at 21:19

TotoroTotoro

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Sergey Kalinichenko · Accepted Answer · 2013-11-25 21:19:20Z

2

Like this:

NSString *newString = [NSString stringWithFormat:@"Array count = %lu", myArray.count];

The reason why your code even compiled is somewhat strange: Objective C interpreted your expression as a comma expression, ignoring the @"Array count = %@" portion, and assigning the value of myArray.count to newString.

This leads to undefined behavior when setText: tries to copy something from the "pointer" pointed to by myArray.count.

answered Nov 25, 2013 at 21:19

Sergey Kalinichenko

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Comments

rfrittelli · Accepted Answer · 2013-11-25 21:42:46Z

1

If you want to be modern:

NSString *str = [@(array.count) stringValue];

answered Nov 25, 2013 at 21:42

rfrittelli

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