First Steps in iOS Development

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Information about First Steps in iOS Development

Published on February 27, 2014

Author: goldshtn



Presentation at ConFoo 2014 on iOS Development. Discussing the basic components of the iOS ecosystem and building a basic todo list manager app with Xcode and storyboards.

Sasha Goldshtein CTO, SELA Group @goldshtn First Steps in iOS Development © Copyright SELA software & Education Labs Ltd. | 14-18 Baruch Hirsch St Bnei Brak, 51202 Israel |

The iOS Platform Apps • 877,013+ of them  Cocoa Touch • UI, gestures, view navigation, media Core Services • Location, threading, HTTP Darwin (kernel) • Drivers, security

Platform Philosophy User Developer Apple • Consistent interface metaphors • Always at home, on any device and in any app • Seamless sync, backup, purchase • Strong push to object orientation • Just one language (Objective C) • Strong separation of concerns in UI – MVC • Full control over the ecosystem, hardware and software • Ultimate arbitrator on whether an app is a fit for the App Store

iOS Devices and Versions September 2013: ≈95% of iOS devices run iOS 6 iPhone 3GS • iOS 3 • iOS 4 Original iPad iPhone 5 iPhone 4/4S • iOS 5 • iOS 6 iPhone 5c/5s • iOS 7

Devices and Resolutions iPhone 3/3GS iPhone 4/4S iPhone 5/5c/5s iPad 1/2 iPad Mini iPad 3/4 3.5” 3.5” 4” 9.7” 7.9” 9.7” 320 480 640 960 640 1136 1024 768 1024 768 2048 153 6

Developing for iOS UIKit Xcode Objective C self.title = [NSString initWithFormat:@"%d", n]; [button setTitle:self.title forState:UIControlStateNormal];

Our First iOS App Demo

Project Components Generated files: Application delegate Initial view controller Main storyboard Property list File for localizable strings Application icons Xcode also adds basic frameworks to your app

iOS MVC Fundamentals View • Draws itself on the screen • Contains generic UIrelated data View Controller • Creates and coordinates views • Populates views and reflects changes to the model Model • UI-agnostic classes • Can be a bunch of objects, a database, a file, an Internet service

Outlets and Actions Xcode connects views and controllers Controller manipulates views through outlets Controller receives events through actions @interface MyViewController : UIViewController @property (nonatomic, weak) IBOutlet UITextField *petName; - (IBAction)getQuote; @end

Connecting UI to Code Demo

iOS Navigation Types Tab bar controller Navigation controller

Storyboards The storyboard describes your application’s view controllers and connects them with segues

Passing Parameters Usually the source view controller sets properties or calls methods on the destination view controller - (void)prepareForSegue:(UIStoryboardSegue *)segue sender:(id)sender { MySecondVC *vc = segue.destinationViewController; vc.itemToDisplay = [self selectedItem]; vc.delegate = self; // For callbacks }

Storyboards and Segues Demo

Summary Objective C fundamentals View controllers, views, outlets, actions Storyboards, segues It’s just another {language, IDE, UI framework} The rest is just details: data, networking, settings, table views, styling, …

Questions Sasha Goldshtein CTO, SELA Group @goldshtn

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