Question

I am trying to convert an int to a string in objective-C.

I read the other questions on SO about converting ints to strings, and I tried this method in my code:

-(void)setCounter:(int)count
{
    counterText.text = [NSString stringWithFormat:@"%d",count];
}

However, if I want to display a number like ’01’ the 0 is taken out of the conversion and only ‘1’ is displayed. Is there a workaround?

Answer 1

There is no such number as 01. If you write

int count = 01;

it is compiled equivalently to

int count = 1;

In fact, be careful: 07 is equivalent to 7, but 011 is equivalent to 9!

What you can do is ask stringWithFormat: to give you the zero-padding:

[NSString stringWithFormat:@"%02d",count]

should give you "02" if count is 2. To deconstruct it:

% - interpolate the next value here
0 - pad it to the width by placing zeroes on the left side
2 - width is 2 characters
d - it will be an integer. Do it now.