First Steps in iOS Development
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The document provides an overview of iOS development, discussing its architecture, key components like Cocoa Touch and the MVC design pattern, and essential tools like Xcode and Objective-C. It highlights the consistent interface across devices and the strong control Apple maintains over the ecosystem. The document also covers the basics of app structure, including view controllers, storyboards, and navigation types.
![Developing for iOS
UIKit
Xcode
Objective
C
self.title = [NSString initWithFormat:@"%d", n];
[button setTitle:self.title forState:UIControlStateNormal];](https://image.slidesharecdn.com/firststepsiosdevelopment-140227101616-phpapp01/85/First-Steps-in-iOS-Development-6-320.jpg)
![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
}](https://image.slidesharecdn.com/firststepsiosdevelopment-140227101616-phpapp01/85/First-Steps-in-iOS-Development-14-320.jpg)
First Steps in iOS Development
- 1. Sasha Goldshtein CTO, SELA Group @goldshtn blog.sashag.net First Steps in iOS Development © Copyright SELA software & Education Labs Ltd. | 14-18 Baruch Hirsch St Bnei Brak, 51202 Israel | www.selagroup.com
- 2. The iOS Platform Apps • 877,013+ of them Cocoa Touch • UI, gestures, view navigation, media Core Services • Location, threading, HTTP Darwin (kernel) • Drivers, security
- 3. 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
- 4. 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
- 5. 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
- 6. Developing for iOS UIKit Xcode Objective C self.title = [NSString initWithFormat:@"%d", n]; [button setTitle:self.title forState:UIControlStateNormal];
- 7. Our First iOS App Demo
- 8. 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
- 9. 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
- 10. 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
- 11. Connecting UI to Code Demo
- 12. iOS Navigation Types Tab bar controller Navigation controller
- 13. Storyboards The storyboard describes your application’s view controllers and connects them with segues
- 14. 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 }
- 16. 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, …
- 17. Questions Sasha Goldshtein CTO, SELA Group @goldshtn blog.sashag.net