• Runtime

• Objects

• Object Basics

• id

• Dynamic Typing

• Memory Management

• Object Messaging

• Message Syntax

• Sending Messages to nil

• The Receiver’s Instance Variables

• Polymorphism

• Dynamic Binding

• Dynamic Method Resolution

• Dot Syntax

• Using the Dot Syntax

• Overview

• General Use

• nil Values

• self

• Performance and Threading

• Usage Summary

• Incorrect Use

• Classes

• Inheritance

• The NSObject Class

• Inheriting Instance Variables

• Inheriting Methods

• Overriding One Method With Another

• Abstract Classes

• Class Types

• Static Typing

• Type Introspection

• Class Objects

• Creating Instances

• Customization With Class Objects

• Variables and Class Objects

• Initializing a Class Object

• Methods of the Root Class

• Class Names in Source Code

• Testing Class Equality

• Source Files

• Class Interface

• Importing the Interface

• Referring to Other Classes

• The Role of the Interface

• Class Implementation

• Referring to Instance Variables

• The Scope of Instance Variables

• Messages to self and super

• An Example

• Using super

• Redefining self

• Allocating and Initializing Objects

• The Returned Object

• Implementing an Initializer

• Constraints and Conventions

• Handling Initialization Failure

• Coordinating Classes

• The Designated Initializer

• Combining Allocation and Initialization

• Overview

• Property Declaration and Implementation

• Property Declaration

• Property Declaration Attributes

• Accessor Method Names

• Writability

• Setter Semantics

• Atomicity

• Markup and Deprecation

• Property Implementation Directives

• Using Properties

• Supported Types

• Property Re-declaration

• Copy

• dealloc

• Core Foundation

• Example

• Subclassing with Properties

• Performance and Threading

• Runtime Difference

• Adding Methods to Classes

• How you Use Categories

• Categories of the Root Class

• Extensions

• Declaring Interfaces for Others to Implement

• Methods for Others to Implement

• Declaring Interfaces for Anonymous Objects

• Non-Hierarchical Similarities

• Formal Protocols

• Declaring a Protocol

• Optional Protocol Methods

• Informal Protocols

• Protocol Objects

• Adopting a Protocol

• Conforming to a Protocol

• Type Checking

• Protocols Within Protocols

• Referring to Other Protocols

• The for…in Feature

• Adopting Fast Enumeration

• Using Fast Enumeration

• Default Dynamic Behavior

• Static Typing

• Type Checking

• Return and Argument Types

• Static Typing to an Inherited Class

• Methods and Selectors

• SEL and @selector

• Methods and Selectors

• Method Return and Argument Types

• Varying the Message at Runtime

• The Target-Action Design Pattern

• Avoiding Messaging Errors

• Enabling Exception-Handling

• Exception Handling

• Catching Different Types of Exception

• Throwing Exceptions

• Synchronizing Thread Execution

• Distributed Objects

• Language Support

• Synchronous and Asynchronous Messages

• Pointer Arguments

• Proxies and Copies

• Mixing Objective-C and C++ Language Features

• C++ Lexical Ambiguities and Conflicts

• Limitations

• Messages

• Defined Types

• Preprocessor Directives

• Compiler Directives

• Classes

• Categories

• Formal Protocols

• Method Declarations

• Method Implementations

• Deprecation Syntax

• Naming Conventions