Thursday, March 1, 2012

Adding integers and adding to a label in Objective-C/UIKit [closed]


I'm fairly new to iPhone development and am having trouble with finding out how to create 2 integers that add 1 or minus 1 to a label. This is supposed to be for a scoreboard app. This is for iPhone and I'm running the latest version of XCode. Thanks!


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2 comments:

  1. UserMarch 1, 2012 at 2:37 AM

    The UILabel (I will assume you use it) takes a NString to be displayed. You need to add the numbers first and then make the string that can be added to the label.

    myLabel.text = [NSString stringWithFormat:@"%d", originalValue + diff];

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  2. UserMarch 1, 2012 at 2:37 AM

    I'm not sure what exactly you want but here's my guess:

    You have a variable that keeps a score on an UILabel object, and you need to add or subtract this value depending on some type of action.

    This is how I would do it:

    @interface Scoreboard : NSObject {
    IBOutlet UILabel *label;
    int counter;
    }
    - (IBAction)addToCounter;
    - (IBAction)subtractToCounter;
    - (void)updateLabel;
    @end

    @implementation Scoreboard
    - (IBAction)addToCounter {
    counter++;
    [self updateLabel];
    }
    - (IBAction)subtractToCounter {
    counter--;
    [self updateLabel];
    }
    - (void)updateLabel {
    label.text = [NSString stringWithFormat:@"Score = %i", counter];
    }
    @end


    I just wrote this from memory but I don't think there is any errors. I hope that helps you. Good luck!

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