The document provides an overview of the core components that make up iOS and OSX operating systems. It outlines the key layers including the Core OS layer, Core Services layer, Media layer, and Cocoa Touch layer. It also briefly describes some of the fundamental technologies that each layer provides such as the kernel, sockets, file system, audio/video playback, and the model-view-controller (MVC) framework.

1. Core OS
OSX Kernel
iOS Mach 3.0
Cocoa Touch BSD
Sockets
Media Security
Power
Core Services Management
Keychain Access
Core OS Certificates
File System
Bonjour

2. Core Services
iOS Collections
Address Book
Cocoa Touch
Networking
File Access
Media SQLite
Core Location
Core Services
Net Services
Core OS Threading
Preferences
URL Utilities

3. Media
iOS Core Audio
OpenAL
Cocoa Touch
Audio Mixing
Audio Recording
Media Video Playback
JPEG, PNG, TIFF
Core Services
PDF
Core OS Quartz (2D)
Core Animation
OpenGL ES

4. Cocoa Touch
iOS Multi-Touch
Core Motion
Cocoa Touch View Hierarchy
Localization
Media Controls
Alerts
Core Services Web View
Map Kit
Core OS
Image Picker
Camera

5. MVC
How your Model is presented
to the user (UI logic)
What your application is (but Your Controller’s minions
not how it is displayed)

6. Objective C
• Superset of the ANSI version of the C
• .h Header files
• .m Source files
• .mm Source files. A source file with this
extension can contain C++ code in addition to
Objective-C and C code
• #import Include header files in your source
code

7. A class declaration

8. Methods
- (void)insertObject:(id)anObject between:(id)aObject and:(id)bObject
[[myObject theArray] insertObject:[myAppObject objectToInsert] atIndex:0];

9. Class Defination
@implementation MyClass
- (id)initWithString:(NSString *)aName
{
self = [super init];
if (self) {
name = [aName copy];
}
return self;
}
+ (MyClass *)createMyClassWithString: (NSString *)aName
{
return [[self alloc] initWithString:aName];
}
@end