Objective-C implicit conversion loses integer precision ‘NSUInteger’ (aka ‘unsigned long’) to ‘int’ warning

I’m working through some exercises and have got a warning that states:

Implicit conversion loses integer precision: ‘NSUInteger’ (aka ‘unsigned long’) to ‘int’

#import <Foundation/Foundation.h>

int main (int argc, const char * argv[])
{
    @autoreleasepool {

        NSArray *myColors;

        int i;
        int count;

        myColors = @[@"Red", @"Green", @"Blue", @"Yellow"];

        count = myColors.count; //  <<< issue warning here

        for (i = 0; i < count; i++)

        NSLog (@"Element %i = %@", i, [myColors objectAtIndex: i]);
    }

    return 0;
}