Applications and iOS

Small guide for different stages of application life in iOS system.

1. APPLICATIONS IN IOS LONG WAY DOWN Alexey Demedeckiy
2. AGENDA • Compilation • Packaging • Signing • Sandbox • Rendering • IPC
3. COMPILATION • Object system • Runtime • LLVM IR • Linking • Memory management
4. OBJECT SYSTEM • Object === C struct • isa - link to class • Class == Object • Object -> Class -> Metaclass -> NSObject
5. OBJECTS AND CLASSES AND METACLASSES
6. RUNTIME • Message sending • @selector(…) • ALL is dynamic • Swift
7. LLVM
8. LINKING • Static (user content) • Dynamic (system frameworks)
9. MEMORY MANAGEMENT • 2 kind of link: own (strong), use (weak) • When nobody own an object - destroy it. • Autorelease pool - tmp objects without owners.
10. PACKAGING • Apps • Bundles • Frameworks • Resources
11. FINAL APP FOLDER STRUCTURE
12. APP STRUCTURE
13. FRAMEWORK STRUCTURE
14. RESOURCES • Text • Locale specific • Device specific • System
15. TEXT
16. IMAGES
17. DEVICE SPECIFIC • ~iphone, ~ipad • @2x, @3x • -568 • Asset catalog
18. ASSET CATALOG • Resizable images • Size class support (orientation, device) • Smaller
19. ASSET CATALOG
20. SYSTEM RESOURCES • iTunes icon • Settings icon • Spotlight icon • App icon • … (tens of them)
21. SIGNING
22. SANDBOX • Only app folder is available. • No access to other processes. • All system communication - over frameworks
23. RENDERING • UIKit • CoreAnimation + CoreGraphics • backboardd. (another process) • 16,5 ms for rendering
24. IPC • Inter app - over frameworks. • Limited use cases. • System communication (Photos, Mail, Maps). • URL schemes.
25. LINKS - COMPILATION • http://www.objc.io/issue-6/mach-o-executables.html • http://clang.llvm.org/docs/IntroductionToTheClangAST.html • http://www.aosabook.org/en/llvm.html • http://www.objc.io/issue-6/compiler.html
26. LINKS - RUNTIME • https://www.youtube.com/watch?v=Ii-02vhsdVk • http://habrahabr.ru/post/250955/
27. LINKS - RESOURCES • https://developer.apple.com/library/ios/recipes/xcode_help- image_catalog-1.0/chapters/CustomizingImageSets.html#// apple_ref/doc/uid/TP40013303-CH5-SW1 • https://developer.apple.com/library/ios/documentation/MacOSX/ Conceptual/BPInternational/MaintaingYourOwnStringsFiles/ MaintaingYourOwnStringsFiles.html • https://developer.apple.com/library/ios/documentation/MacOSX/ Conceptual/BPFrameworks/Frameworks.html#//apple_ref/doc/uid/ 10000183-SW1
28. LINKS - SIGNINIG • http://www.objc.io/issue-17/inside-code-signing.html • https://developer.apple.com/library/ios/documentation/IDEs/ Conceptual/AppDistributionGuide/Introduction/ Introduction.html#//apple_ref/doc/uid/TP40012582-CH1-SW1
29. LINKS - RENDERING • https://speakerdeck.com/vtopoliuk/responsive-ui-for-ios-apps • https://developer.apple.com/videos/wwdc/2011/#121
30. dalog@me.com Questions?