Question

I’m trying to create a Cocoa Objective-C program on my Snow Leopard MacBook running Xcode 4.2. Here/s what I want to do.

I have a textbox, a wrapping label, and a button. When you enter your name in the text box the wrapping label displays, "Have a merry merry christmas 'the name entered in the textbox'"

    //  AppDelegate.h
    #import <Cocoa/Cocoa.h>
    @interface AppDelegate : NSObject <NSApplicationDelegate>
    {
        IBOutlet id inputTextField;
        IBOutlet id outputTextField;
    }
    @property (assign) IBOutlet NSWindow *window;
    - (IBAction)pressMeButton:(id)sender;
    @end

    //  AppDelegate.m
    #import "AppDelegate.h"
    @implementation AppDelegate
    //Use the pressMeButton IBAction to tell the inputTextField to display on the outputLabelField
    - (IBAction)pressMeButton:(id)sender;
    { 
        char inputString = [inputTextField charValue];
        char outputString = [outputTextField charValue:(@"Have a merry merry Christmas, %@", inputString)];
        [outputTextField outputString];
    }
    @end

I tried NSString, but I’m not sure what I’m doing wrong here.

Answer 1

You’re close, but far at the same time. It doesn’t make any sense to store a sequence of characters in a char type, which is for single char. Also, it doesn’t make sense to call a message which is actually a local variable. Anyway, here’s some code to help you.

- (IBAction)pressMeButton:(id)sender;
{
    [outputTextField setStringValue:
      [NSString stringWithFormat:@"Have a merry merry Christmas, %@",
                                   [inputTextField stringValue]]];
}

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