Assignment2B-Walkthrough iPhone开发教程讲义.pdf

CS193P Assignment 2B Walkthrough Winter 2010 Cannistraro/Shaffer CS193P: HelloPoly Walkthrough Overview The goal of this ‘walkthrough’ is to give you a fairly step by step path through building a simple Cocoa Touch application. You are encouraged to follow the walkthrough, as it should help you successfully complete the assignment, help you quickly become familiar with the tools and basic iPhone development workflow. Also keep in mind, that although you will be navigating a series of steps in tools, what you are building is the connected group of objects diagrammed below. You will define a controller object with instance variables (outlets) that refer to the user interface elements. The controller object implements behavior, action methods, that adjusts the number of sides of a polygon. You will connect each control so that the target of the control is the controller, and the action that will be sent is one of ‘increase’ or ‘decrease’. Create a new Cocoa Touch project: 1. Select menu File New Project… 2. Select iPhone OS Application, then choose the Window-Based Application template 3. Name the project ‘HelloPoly’ Page 1 of 14 CS193P Assignment 2B Walkthrough Winter 2010 Cannistraro/Shaffer Setting the Active SDK For simplicity, we’ll use the iPhone Simulator in this walkthrough. When building iPhone applications you need to tell Xcode which platform to build against. To change the Active SDK use the Project Set Active SDK menu item. Set this to ‘Simulator - iPhone OS 2.0’. There is also a handy toolbar popup labe