Cocoa Dev Central: Learn Objective-C. Objective-C Objective-C is the primary language used to write Mac software. If you're comfortable with basic object-oriented concepts and the C language, Objective-C will make a lot of sense. If you don't know C, you should read the C Tutorial first. This tutorial is written and illustrated by Scott Stevenson Copyright © 2008 Scott Stevenson Calling Methods To get started as quickly as possible, let's look at some simple examples. [object method]; [object methodWithInput:input]; Methods can return a value: output = [object methodWithOutput]; output = [object methodWithInputAndOutput:input]; You can call methods on classes too, which is how you create objects. Id myObject = [NSString string]; The id type means that the myObject variable can refer to any kind of object, so the actual class and the methods it implements aren't known when you compile the app.
In this example, it's obvious the object type will be an NSString, so we can change the type: NSString* myString = [NSString string]; Accessors. Main. Main. Tictactoe. GNUstep.org. A GNUstep Programming Tutorial. TimeMachine Single Window Application Single window application is one of the most commonly used application type. Here, a TimeMachine application is made to demonstrate several techniques of GNUstep programming.
Outlet and Action I'll write an application which show the current time with a button to update. Figure 4-1. This application is very easy. Open Gorm, choose "Document->New Application", and build a window with a title and a button. Figure 4-2. You can set the title of the button in the inspector. Figure 4-3. That's all I need to do on the interface. Now, I need an "controller" to receive the action from the "view", and display the time on the "view". First, I need to design the class of this "controller". Figure 4-4. It will show all the classes you can use. Figure 4-5. Double-click on it to change the name.
Figure 4-6. Then I need a "outlet" in this class to connect to the label in the window, and an "action" which is triggered when the button is press. Figure 4-10. Figure 4-11. SuburbanCoder. Java.com: Java + You.