Example code programming Objective-C with Cocoa in Xcode and Interface Builder (Leopard)
2: Example: Menu Item
Implementing a simple Menu item
In XCode: File->New Project->Cocoa Application
Call it: MenuApp
Next do: File->New File and choose Objective C Class.
Call the files MyMenuController.h and MyMenuController.m, code them as shown below and save. Note these are subclassed as NSMenu.
// MyMenuController.h // MenuApp #import <Cocoa/Cocoa.h> @interface MyMenuController : NSMenu { } - (IBAction)doIt:(id)pId; - (IBAction)doItAgain:(id)pId; @end // MyMenuController.m // MenuApp #import "MyMenuController.h" @implementation MyMenuController - (IBAction)doIt:(id)pId; { NSLog(@"Hi there"); } // end doIt - (IBAction)doItAgain:(id)pId; { NSLog(@"Hi there Again"); } // end doItAgain @end
Now bring up Interface Builder by double clicking on MainMenu.nib in the Resources section of MenuApp
Drag a Menu onto the menu bar, then click on it and drag another menu item onto the drop down list of items.
Rename the items to 'Do it' and 'Do it again' by double clicking each item in turn and changing the selected text.
Choose MyMenuController from the Class menu in the Inspector
Interface Builder showing the NSMenu menu with menu items and the object class in the Inspector
Choose the Connections display in the Inspector and drag from the connection circle next to the Action 'doIt' to the button you dragged onto the window.
You will see a label pop-up as shown in the picture below.
Let go the mouse button and the display will change as shown.
Interface Builder showing linking action with menu item
Save Interface Builder.
Return to XCode. Choose Run->Console. Now Build and Run.
You will see 'Hi There' appear in the Console log.
Interface Builder showing the working menu item
If you want to download the code
Click the Download Link to obtain 002-MenuApp.zip file of this whole OS X 10.5 Leopard program.
