Question

I’m struggling with concatenating NSStrings and ints. In isolation the below code works great. It returns “This is a test string with an int 10”

int myInt =10;

NSString *newstring =
[NSString stringWithFormat: @"This is a test string with an int %i", myInt];

NSLog(@"%@", newstring);

However when I put the below code into my project i get an error: Implicit conversion of int to NSString is disallowed with arc.”

[_mycrop setTempLeft: (@"left value %i is %i", count, [_mycrop leftValue])];

Could anybody suggest where I’m going wrong? Although im passing in 2 variables, to my mind both are essentially the same.

Answer 1

The code “in isolation” is very different from the second code.

You have to use stringWithFormat: in the second example too.

[_mycrop setTempLeft:[NSString stringWithFormat:@"left value %i is %i", count, [_mycrop leftValue]]];

Or with two lines but easier to understand:

NSString *tempLeft = [NSString stringWithFormat:@"left value %i is %i", count, [_mycrop leftValue]];
[_mycrop setTempLeft:tempLeft];

Some documentation: Apple String Programming Guide – Formatting String Objects