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CHAPTER 4: Core iPhone Tools
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developer.apple.com site: in effect you will either create a new Apple ID or use your
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existing ID. This level of access to the SDK allows you to do more or less everything that we are going to cover in this book. The main things you miss out on with this free level of access are that you can t put your applications onto a real iPhone, and you can t submit them for sale on the App Store. To get those features you need to upgrade your developer registration. This is not free, and the cost depends on whether you register as an individual or a company. So if you can t upload your application to an actual iPhone, you might be wondering how you get to develop and test your shiny new application idea. The answer is the iPhone emulator. The iPhone SDK includes a faithful emulation of the iPhone not just the user interface, but the detailed functionality (sadly, without being able to make phone calls!). In practice, the iPhone emulator gives you access to almost everything that you can do on a real iPhone or iPod Touch apart from the networking features. NOTE: This book is primarily focused on giving you a good grounding in the use of the Xcode Developer Tools and isn t intended to teach you how to write great iPhone software. As such, there are some aspects of Objective-C and application design that we will not be covering here. However there are some great books out there that will do just that, such as the excellent Beginning iPhone Development from Apress.
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Getting and Installing the SDK
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Let s get to it. Go to the developer site, register as an iPhone Developer if you haven t already done so (http://developer.apple.com/iphone/program/start/register/), and then go to the downloads page to get the iPhone SDK (http://developer.apple.com/technology/xcode.html). By the time you read this, Apple may have released a combined Xcode installation for both Mac OS X and iPhone, in which case you will need to download and install this. It will overwrite your Mac OS X Xcode installation but should not affect your preferences. Once you ve downloaded the kit, you install the iPhone Xcode tools in the usual way. The main difference that you will see once the iPhone SDK is in place is that you will have some new options in the Xcode New Project window (see Figure 4 1). As well as the Mac OS X options, you now have an entry in the list for the iPhone OS.
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CHAPTER 4: Core iPhone Tools
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Figure 4 1. iPhone application options in the Xcode New Project window
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Writing a Simple iPhone Application
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To illustrate the similarities and some basic differences between Mac and iPhone development, you are going to recreate one of the programs you wrote in the last chapter, the modified Hello World application. So as not to confuse the applications, you should give this a different name; how about Show Message . Here is how it is going to look when it is complete (see Figure 4 2). Start by creating the project. Choose the iPhone OS section, then View-based application. Call it Show Message . Once in the Xcode workspace, let s start with a little orientation. This is the same old Xcode Project Workspace window you have seen so far, but there are a couple of differences that you can spot pretty quickly. See Figure 4 3.
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CHAPTER 4: Core iPhone Tools
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Figure 4 2. The completed Show Message application
Figure 4 3. The Project Workspace window for our iPhone application
CHAPTER 4: Core iPhone Tools
In the toolbar you will see that this application is going to be compiled against the iPhone Simulator as a target. Also, we are using the UIKit Framework in place of the normal AppKit Framework. Finally, you will see that you have Controllers and NIB files for the Main View and the Flipside View. This is going to be an iPhone application that has an info button to flip it over. Many iPhone applications use this visually appealing metaphor to show a configuration or About view. Let s see how much it already does. Click on Build and Go. Although you haven t added any code yet, the emulator shows you a working application, including the functionality to flip the application over to see the information screen. To quit the emulator, just choose Quit from the iPhone Simulator menu or press Q. So, onto the code. It makes sense to start with what you had working before, right So let s have a quick reprise of the code in that earlier application (see Listings 4 1 and 4 2).
Listing 4 1. HelloController.h #import <Cocoa/Cocoa.h> @interface HelloController : NSObject { IBOutlet NSTextField *destinationTextField; IBOutlet NSTextField *sourceTextField; } - (IBAction)sayHello:(id)sender; @end Listing 4 2. HelloController.m #import "HelloController.h" @implementation HelloController - (IBAction)sayHello:(id)sender { [destinationTextField setStringValue:[sourceTextField stringValue]]; } @end
The code in bold is what you added to the stubs provided by Xcode. So, start by cutting and pasting that code into the corresponding files in your new iPhone application. Make the MainViewController.h file look like Listing 4 3 (you need to add the code in bold):
Listing 4 3. MainViewController.h #import "FlipsideViewController.h" @interface MainViewController : UIViewController <FlipsideViewControllerDelegate> { IBOutlet NSTextField *destinationTextField; IBOutlet NSTextField *sourceTextField; } - (IBAction)showInfo; - (IBAction)sayHello:(id)sender;
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