Intro to Native ios Development. Dave Koziol Arbormoon Software, Inc.

Transcription

1 Intro to Native ios Development Dave Koziol Arbormoon Software, Inc.

2 About Me Long time Apple Developer (20 WWDCs) Organizer Ann Arbor CocoaHeads President & ios Developer at Arbormoon Software Inc. Wunder Radio, XanEdu, A2YChamber, several others in the pipeline or privately released.

3 Requirements Intel Mac with 10.6.x Apple ios Developer Account Xcode and ios SDK (3.5GB Download)

4 ios Devices iphone (iphone, iphone 3G, iphone 3GS) iphone 4 (AT&T, Verizon) ipod Touch (1st, 2nd, 3rd, 4th Generations) ipad AppleTV 2.0*

5 Typical Development Process Develop App in Xcode Developer tests on device(s) with developer builds Testers test on devices with Ad Hoc Builds Distribute via itunes

6 ios (no not the Cisco one...) Heavily based on Mac OS X Applications are typically written in Objective-C, or Objective-C++ Applications are sandboxed True multitasking OS, but ability to use multitasking is limited.

7 ios Stack Your App CocoaTouch Media Core Services Core OS

8 ios Stack Core OS Your App CocoaTouch Media Core Services Core OS BSD/POSIX Sockets File System Bonjour Keychain Threads Security

9 ios Stack Core Services Your App CocoaTouch Media Core Services Core OS SQLite Core Location Address Book Collections Core Location Preferences Core Motion

10 ios Stack Media Your App CocoaTouch Media Core Services Core OS Core Graphics Core Text OpenGL ES AV Foundation Core Audio Video Playback Core Animation

11 ios Stack CocoaTouch Your App CocoaTouch Media Core Services Core OS UIKit GameKit MapKit iad

12 The Tools Xcode Interface Builder Instruments

13 Xcode

14 Interface Builder

15 Instruments

16 Objective-C Superset of ANSI C, introduced in 1986 Object-oriented with single-inheritance model Uses a runtime to dispatch methods No garbage collection*, must track memory

17 Objective-C method calls NSMutableDictionary *dict = [[NSMutableDictionary alloc] init]; [dict setobject: foo forkey: bar]; NSObject *myfoo = [dict objectforkey: bar]; [... ] denotes method calls Parameters are set off with : Method calls name their arguments Message dispatch is dynamic

18 Objective-C++ Objective-C with support for using C++ objects. Clang doesn t fully support Objective-C++

19 Memory Management Low memory systems. Pay attention... Objective-C objects are reference counted alloc, copy give objects have ref count of 1 retain increments count by 1 release decreases count by 1 objects freed when reference count is 0 dealloc called when objects are freed.

20 Memory Management Autorelease autorelease means call release at some point in the future. typically, next time through event loop Must have an NSAutoreleasePool Many Apple methods return autoreleased objects

21 Memory Management (nonatomic, retain) NSString* myprop; Declares intent for threading, memory management, mutability Compiler can create getter and setters or you can roll your own. Use self.myprop = [... ] with retained and copy properties. Free retain and copy properties in dealloc

22 Views & Controllers GUI widgets are UIViews UIViewControllers drive the UIViews Typically have one of each page of your App. Might have UINavigationControllers or UITabBarControllers to switch views. Views can be defined in code or in zibs.

23 UINavigationBar UITableView UITableViewCell UITabBar

24 More Views UIButton, UILabel, UITextField, UISlider, UISwitch, UISegmentedController, UIPickerView, UIActivityIndicatorView, UIImageView, UIPageControl, UIWebView, MKMapView, UISearchBar,

25 App Life Cycle Starts in main(int argc, char * argv) Typically creates NSAutoreleasePool Typically calls UIApplicationMain(argc, argv, nil, nil) Info.plist defines main zib ( nib ) for App App Delegate typically implements applicationdidfishinglaunching: View Controllers often override viewdidload: or viewdidappear:

26 Delegates Common ios Development Pattern Similar to observers, get called when things happen Only one delegate Common Examples UIApplicationDelegate, NSURLConnectionDelegate, NSXMLParserDelegate, UIActionSheetDelegate, MFMailCompseViewControllerDelegate

27 Protocols Enabling technology for Delegates Must implement required methods. Can implement optional methods Similar to Java Interfaces

28 Debugging NSLog - Output to console Warning this can be expensive in release builds Visual Debugger Test on a real device

29 ios RoadMap Open GL on Mobile Devices- 9:45am-12:00pm 15w Tour around Xcode - 11am Auditorium ios Testing - 11am Artic A ios Development with Blocks - 1:30pm Auditorium ios Third Party Tools - 1:30pm Artic B Xcode Instruments - 2:45pm Auditorium SQLite 3-2:45pm 15w-6111 ios Multi Media - 4pm Artic B

30 Resources ios Dev Program: iphone SDK Development Bill Dudney, Christopher Adamson CocoaHeads Ann Arbor Web: MailingList: CocoaHeads Detroit Web:

31 Q&A