UILabel is not displaying the correct string

Question

Hello!

I have a UILabel I created on one of my views in my application. I have it set to a static text in IB, but I'm going to change that text programmatically.

Here's how I was trying to do it.

fahrenheitLabel.text = (@"Temperature: %@", text); 
//fahrenheitLabel is my UILabel
//"text" is a NSString

I expected the output to be Temperature: 84, for example.

No matter what order I try it, however, I always just get 84.

When I do NSLog(@"Temperature: %@", text); I get the desired result in the Console.

Is there any reason why my UILabel is not displaying the same result as the NSLog call?

Thank you for your help!

Answer 1

Should be:

fahrenheitLabel.text = [NSString stringWithFormat:@"Temperature: %@",text];

Answer 2

NSLog(,); is a function call that is set up for formatting text and will work. (,); has nothing to do with formating text and won't work.

In fact (,) is just the comma operator. These will be evaluated in order and the last one returned. For example:

int a = 1;
int b = 2;
int c = 3;
int x = a, b, c;

Will leave x with the value of c, that is 3.

In your case the comma operator will just return the last item which is "text" and which is why you see 84 all the time.

You should use the NSString formating calls to combine strings the way that you want.