Arrays and addition - ios

Question

What I want to have happen:
Items in array show up in a label. Each item in the array will have it's own label.
I eventually want to add more items.
And make it so that index 0 of thisArray can be added to index 0 of that array; display in a label;
object at index 1 in thisArray can be added to object at index 1 in thatArray and then the result can be displayed in a separate label,
and so on
To appear on a button click.
I'm having a lot of trouble implementing this and I feel like it is a lot simpler than I am making it. Any insight would be appreicated!!
#import "ViewController.h"
#interface ViewController ()
#end
#implementation ViewController
- (void)viewDidLoad
{
[super viewDidLoad];
// Do any additional setup after loading the view, typically from a nib.
self.steakArray = [[NSArray alloc] initWithObjects: #"800", #"50", nil];
//NSString *name;
NSString *calories = [_steakArray objectAtIndex:0];
NSString *fat = [_steakArray objectAtIndex:1];
}
- (void)didReceiveMemoryWarning
{
[super didReceiveMemoryWarning];
// Dispose of any resources that can be recreated.
}
//this doesn't work, this is what I want to have happen though.
//click button, show this in label.
- (IBAction)steak:(id)sender {
self.infoLabel.text = calories, fat;
}
#end

Answer 1

You need to look at this documentation https://developer.apple.com/library/mac/documentation/Cocoa/Conceptual/Strings/Articles/FormatStrings.html
You can use String with Format:
NSString *string1 = [NSString stringWithFormat:#"A string: %#, a float: %1.2f",
#"string", 31415.9265];
// string1 is "A string: string, a float: 31415.93"
NSNumber *number = #1234;
NSDictionary *dictionary = #{#"date": [NSDate date]};
NSString *baseString = #"Base string.";
NSString *string2 = [baseString stringByAppendingFormat:
#" A number: %#, a dictionary: %#", number, dictionary];
// string2 is "Base string. A number: 1234, a dictionary: {date = 2005-10-17 09:02:01 -0700; }"

Answer 2

Even if you are getting calories in string, you can use the following code to add and display in the label
NSString *calories1 = [_steakArray objectAtIndex:0];
NSString *calories2 = [_steakArray2 objectAtIndex:0];
int sum = [calories1 intValue] + [calories2 intValue];
self.infoLabel.text = [NSString stringWithFormat:#"%d",sum];