Building a Completed iPhone App

Presented by Vu Tran Lam

Building aCompleted iPhone App

Friday, March 29, 13

Could You Build Apps For This...?

...And This...?

Set UpWhen you develop apps, you use the iOS SDK and Xcode (Apple’s IDE). Xcode provides everything you need to create great apps for iPhone, iPod touch, and iPad. It includes a source editor, a graphical user interface editor, and many other features. Xcode employs a single window (workspace window), that presents most of the tools you need to develop apps. The iOS SDK extends the Xcode toolset to include the tools, compilers, and frameworks you need specifically for iOS.

LanguageObjective-C is an elegant object-oriented language that powers all iOS apps. You write Objective-C code to create your app, and you need to understand this language in order to use most application frameworks. Although you can use other languages for development, you can’t build an iOS app without Objective-C.

Development

• Frameworks

Development

FrameworksAn app consists of code that you write and frameworks provided by Apple. A framework contains a library of methods that your app can call. More than one app can access a framework library at the same time.

Using an Object-Oriented Framework

Handle the Events

Survey Major Frameworks

• Frameworks• Design Patterns

Development

Design PatternsA design pattern solves a common software engineering problem. Patterns are abstract designs, not code. When you adopt a design, you adapt the general pattern to your specific needs.

Design Pattern: Model-View-Controller

• Frameworks• Design Patterns• Human Interface Design

Development

Human Interface DesignIt’s not enough to create an app that works. Users expect iOS apps to be intuitive, interactive, and engaging. Think about the user experience as you design every aspect of your app, from the features you choose to the way your app responds to a gesture.

Human Interface Design

• Types of App

• Types of App• Wireframing

• Types of App• Wireframing• Icons

• Frameworks• Design Patterns• Human Interface Design• App Design

Development

App Design

Before you begin writing a line of code, you should make some critical design decisions:• Be as specific as possible about your app’s purpose and features• Choose the kind of data model your app will use• Decide on UI style for your app (e.g. single view or master-detail) • Decide your app to be universal (runs on iPad, iPhone, iPod touch) These and other design decisions help you to construct the architecture of your app.

• Frameworks• Design Patterns• Human Interface Design• App Design• App Store

Development

App StoreTo make a great app, you need to test it on actual devices throughout the development process, not just in Simulator. To run an app on iOS-based devices, you need to register the devices you want to test on, create certificates that authorize developers to sign an app, and create an app ID to identify the app. Finally, you will do to publish an app on the App Store.

Xcode IDE

Xcode Workspace

Toolbar Xcode Workspace

Toolbar

Navigation Selector Bar

Filter Bar

Project Navigator

Xcode Workspace

Toolbar

Filter Bar

Interface Builder

Project Navigator

Xcode Workspace

Toolbar

Jump Bars

Filter Bar

Interface Builder Editor Area

Project Navigator

Xcode Workspace

Toolbar

Library Selector Bar

Filter Bar

Inspector Selector Bar

Inspector Pane

Library Pane

Project Navigator

Jump Bars

Xcode Workspace

Toolbar

Library Selector Bar

Filter Bar

Inspector Selector Bar

Debug Bar

Inspector Pane

Library Pane

Debug Area

Project Navigator

Jump Bars

Xcode Workspace

Your First iOS App - Hello World

Introduction

First iOS App introduces Three Ts of iOS app development:• Tools: How to use Xcode to create and manage a project?• Technologies: How to create an app that responds to user input?• Techniques: How to take advantage fundamental design patterns?

Part 1: Getting Started

• Create and Test a New Project• Anatomy of an Application• Find Out How an Application Starts Up

• Look at UIApplicationMain Function• Look at Storyboad File• Look at Property List File• Understand View and Window Architecture

Anatomy of an Application

• Compiled code• Storyboard files• Resources (images, sounds, strings, etc)• Info.plist file (application configuration)

• Compiled code• Your code• Framework

• Storyboard files• Resources (images, sounds, strings, etc)• Info.plist file (application configuration)

• Compiled code• Your code• Framework

• Storyboard files• UI elements and other objects• Details about object relationships

• Resources (images, sounds, strings, etc)• Info.plist file (application configuration)

Your Code

Storyboard

Your Code

Storyboard

Info.plist File

Your Code

Storyboard

Info.plist File

Framework

Understanding View and Window ArchitectureViews and windows present your application’s user interface and handle the interactions with that interface. UIKit and other system frameworks provide a number of views that you can use as-is with little or no modification. You can also define custom views for places where you need to present content differently than the standard views allow.

Part 2: Inspecting View Controller and Its View

• Use Inspector to Examine View Controller• Open Inspector

• Change View’s Background Color• Set Background Color of View Controller’s View• Restore Background Color of View Controller’s View

Change View’s Background Color

Part 3: Configuring View

• Understand View Controller Basics• Add User Interface Elements• Create an Action for Button• Create Outlets for Text Field and Label• Make Text Field’s Delegate Connection• Test Application

Understand View Controller BasicsView controllers are a vital link between an app’s data and its visual appearance. Whenever an iOS app displays a user interface, the displayed content is managed by a view controller or a group of view controllers coordinating with each other. Therefore, view controllers provide the skeletal framework on which you build your apps.

Understand View Controller BasicsA key part of any view controller’s implementation is to manage the views used to display its content. It’s very difficult to manage many connections view controllers. Instead, use Interface Builder to create storyboards. Storyboards make it easier to visualize the relationships in your app and simplify the effort needed to initialize objects at runtime.

Interface Builder

Understand View Controller BasicsThis is “Hello World” window with its target screen and content views. On the left, you can see the objects that make up this interface and understand how they are connected to each other.

Add User Interface ElementsYou add user interface (UI) elements by dragging them from the object library to a view on the canvas. After adding UI elements, you can move and resize them.

Create an Action for ButtonControl-drag, press and hold the Control key while you drag from the button to the implementation file in the assistant editor pane. After that, you must input as following:

Create Outlet for Text FieldControl-drag, press and hold the Control key while you drag from the text field to the implementation file in the assistant editor pane. After that, you must input as following:

Create Outlet for LabelControl-drag, press and hold the Control key while you drag from the label to the implementation file in the assistant editor pane. After that, you must input as following:

Make Text Field’s Delegate ConnectionControl-drag, press and hold the Control key while you drag from text field to the yellow sphere in the scene dock. After that, you must input as following:

Control-drag and select delegate

Test Application

Part 4: Implementing View Controller

• Add a Property for User’s Name

@property (copy, nonatomic) NSString *userName;

In HelloWorldViewController.h, type:

• Add a Property for User’s Name• Implement changeGreeting: Method

- (IBAction)changeGreeting:(id)sender{ self.userName = self.textField.text; NSString *nameString = self.userName; if (nameString.length == 0) { nameString = @"World"; }

NSString *greeting = [[NSString alloc] initWithFormat: @"Hello, %@!", nameString]; self.label.text = greeting;}

In HelloWorldViewController.m, type:- (IBAction)changeGreeting:(id)sender{ self.userName = self.textField.text; NSString *nameString = self.userName; if (nameString.length == 0) { nameString = @"World"; }

NSString *greeting = [[NSString alloc] initWithFormat: @"Hello, %@!", nameString]; self.label.text = greeting;}

In HelloWorldViewController.m, type:

• Add a Property for User’s Name• Implement changeGreeting: Method• Configure View Controller as Text Field’s Delegate

- (BOOL) textFieldShouldReturn: (UITextField *)theTextField{ if (theTextField == self.textField) { [theTextField resignFirstResponder]; } return YES;}@end

In HelloWorldViewController.m, type:

In HelloWorldViewController.h, add <UITextFieldDelegate>:@interface HelloWorldViewController : UIViewController <UITextFieldDelegate>

• Add a Property for User’s Name• Implement changeGreeting: Method• Configure View Controller as Text Field’s Delegate• Run Application

Next...

many thanks to

Thank you

lamvt@fpt.com.vnpleasesay

Stanford Universityhttps://developer.apple.com

Developer Center

http://www.stanford.edu/class/cs193p

xin chào

Referenceshttp://az4you.wordpress.comhttp://www.slideshare.net/vutlam9083/building-a-completed-iphone-app

Building a Completed iPhone App

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