Question

I’m new to developing in iOS and successfully ran through a tutorial on how to create and connect outlets in a Mac OSX Cocoa App. However, when I try to follow the same process for my iPhone app, I keep hitting walls… (Apologies for the lengthy example- please bear with)

Project A:

In xCode:

1. Create new Mac OSX Cocoa Application

2. Create a new class

   SimpleViewController : NSObject

---

#import <Cocoa/Cocoa.h>

@interface SimpleViewController : NSObject {
    IBOutlet NSTextField *aField;
    IBOutlet NSButton *aButton;
}

@end

In Interface Builder:

1. File > Read class files
2. Drag
   SimpleViewController from my library
   into the main.nib
3. Ctl-drag from
   SimpleViewController to view
   elements to connect my outlets

Everything above works great.
Now for the same thing in an iPhone app:

Project B:

In XCode:

1. Create new iPhone OS Window-Based Application

2. Create a new class

   SimpleViewController : UIViewController

---

#import <UIKit/UIKit.h>
@class NSTextField;
@class NSButton;

@interface EmbedComplexViewController : UIViewController {
    IBOutlet NSTextField *aField;
    IBOutlet NSButton *aButton;
}

@end

(Notice my view controller is now an extension of UIViewController, not NSObject. Also, this time I need to use forward class declarations for my outlet classes. Not a problem, but is this necessary?)

In Interface Builder:

1. File > Read class files
2. Drag
   SimpleViewController from my library
   into the main.nib
3. Ctl-drag from
   SimpleViewController to view
   elements – BUT now I can’t see any of my declared outlet member variables. Instead, the only outlet option I have is ‘view’

What more do I need to do to have my declared outlets show up?

Thanks- Yarin

Answer 1

In iOS development, we use UIButton and UITextField and etc, (see the iphone developer documentation).

And no, you don’t need to forward declare those classes (it made you since they weren’t included in UIKit