Essential Objective-C

Getting started
- Getting started with Objective-C Language
- Hello World
Protocols
- Protocols
- Optional and required methods
- Checking existance of optional method implementations
- Basic Protocol Definition
- Conforming to Protocols
- Forward Declarations
- Check conforms Protocol
Blocks
- Blocks
- Block Typedefs
- Blocks as Properties
- Blocks as Method Parameters
- Blocks as local variables
- Defining and Assigning
Categories
- Categories
- Conforming to protocol
- Simple Category
- Declaring a class method
- Adding a property with a category
- Create a Category on XCode
Key Value Coding and observing
- Key Value Coding Key Value Observing
- Most Common Real Life Key Value Coding Example
- Key Value Observing
- Querying KVC Data
- Collection Operators
Logging
- Logging
- Logging
- NSLog Output Format
- Logging Variable Values
- Removing Log Statements from Release Builds
- Empty message is not printed
- Using FUNCTION
- NSLog vs printf
- Logging NSLog meta data
- NSLog and BOOL type
- Logging by Appending to a File
NSArray
- NSArray
- Creating Arrays
- Accessing elements
- Reverse an Array
- Converting NSArray to NSMutableArray to allow modification
- Converting between Sets and Arrays
- Using Generics
- Comparing arrays
- Sorting Arrays
- Filtering Arrays With Predicates
- Enumerating using blocks
- Looping through
- Sorting array with custom objects
- Move object to another index
- Deleting Elements
- Insert Elements
- Adding elements
- Finding out the Number of Elements in an Array
- Add objects to NSArray
Classes and objects
- Classes and Objects
- Difference between allocation and initialization
- Creating classes with initialization values
- Singleton Class
- The instancetype return type
- Specifying Generics
NSString
- NSString
- Encoding and Decoding
- String Length
- Splitting
- Comparing Strings
- Creation
- Searching for a Substring
- Changing Case
- Joining an Array of Strings
- Removing Leading and Trailing Whitespace
- Formatting
- Working with C Strings
- Reversing a NSString Objective-C
NSDictionary
- NSDictionary
- Create
- NSDictionary to NSArray
- NSDictionary to NSData
- NSDictionary to JSON
- Block Based Enumeration
- Fast Enumeration
NSDictionary
- NSDictionary
- Creating using literals
- Creating using dictionaryWithObjectsAndKeys
- Creating using plists
- Setting a Value in NSDictionary
- Getting a Value from NSDictionary
- Check if NSDictionary already has a key or not
Low-level runtime environment
- Low-level Runtime Environment
- Augmenting methods using Method Swizzling
- Attach object to another existing object association
- Calling methods directly
NSArray
- NSArray
- Creating NSArray instances
- Sorting Arrays
- Filter NSArray and NSMutableArray
NSURL
- NSURL
- Create
- Compare NSURL
- Modifying and Converting a File URL with removing and appending path
Methods
- Methods
- Class methods
- Method parameters
- Create a basic method
- Return values
- Calling methods
- Instance methods
- Pass by value parameter passing
- Pass by reference parameter passing
Error handling
- Error Handling
- Asserting
- Error Exception handling with try catch block
Enums
- Enums
- typedef enum declaration in Objective-C
- Defining an enum
- Converting C std vectorEnum to an Objective-C Array
NSData
- NSData
- Create
- Get NSData lengh
- Encoding and decoding a string using NSData Base64
- NSData and Hexadecimal String
Random numbers
- Random Integer
- Basic Random Integer
- Random Integer within a Range
Properties
- Properties
- Custom getters and setters
- What are properties
- Properties that cause updates
NSDate
- NSDate
- Creating an NSDate
- Date Comparison
- Convert NSDate that is composed from hour and minute only to a full NSDate
- Converting NSDate to NSString
NSPredicate
- NSPredicate
- Filter By Name
- Find movies except given ids
- Find all the objects which is of type movie
- Find Distinct object ids of array
- Find movies with specific ids
- Case Insensitive comparison with exact title match
- Case sensitive with exact title match
- Case Insensitive comparison with matching subset
NSMutableArray
- NSMutableArray
- Creating an NSMutableArray
- Sorting Arrays
- Deleting Elements
- Move object to another index
- Adding elements
- Filtering Array content with Predicate
- Insert Elements
NSRegularExpression
- NSRegularExpression
- Check whether a string matches a pattern
- Find all the numbers in a string
NSJSONSerialization
- NSJSONSerialization
- JSON Parsing using NSJSONSerialization Objective c
Memory management
- Memory Management
- Automatic Reference Counting
- Strong and weak references
- Manual Memory Management
- Memory management rules when using manual reference counting.
Singletons
- Singletons
- Using Grand Central Dispatch GCD
- Creating Singleton and also preventing it from having multiple instance using allocinit new.
- Creating Singleton class and also preventing it from having multiple instances using allocinit.
NSCalendar
- NSCalendar
- System Locale Information
- Initializing a Calendar
- Calendrical Calculations
NSMutableDictionary
- NSMutableDictionary
- NSMutableDictionary Example
- Removing Entries From a Mutable Dictionary
Multi-threading
- Multi-Threading
- Creating a simple thread
- Create more complex thread
- Thread-local storage
NSAttributedString
- NSAttributedString
- Creating a string that has custom kerning letter spacing editshare
- Create a string with text struck through
- Using Enumerating over Attributes in a String and underline part of string
- How you create a tri-color attributed string.
NSTimer
- NSTimer
- Creating a Timer
- Invalidating a timer
- Manually firing a timer
- Storing information in the Timer
Structs
- Structs
- CGPoint
- Defining a Structure and Accessing Structure Members
Subscripting
- Subscripting
- Subscripts with NSArray
- Custom Subscripting
- Subscripts with NSDictionary
Basic data types
- Basic Data Types
- BOOL
- SEL
- id
- IMP implementation pointer
- NSInteger and NSUInteger
Unit testing using XCode
- Unit testing using Xcode
- Note:
- Testing a block of code or some method
- Testing asynchronous block of code
- Measuring Performance of a block of code
- Running Test Suits
Fast enumeration
- Fast Enumeration
- Fast enumeration of an NSArray
- Fast enumeration of an NSArray with index.
NSSortDescrip
- NSSortDescriptor
- Sorted by combinations of NSSortDescriptor
Inheritance
- Inheritance
- Car is inherited from Vehicle
NSTextAttachment
- NSTextAttachment
- NSTextAttachment Example
NSUrl send POST request
- NSUrl send a post request
- Simple POST request
- Simple Post Request With Timeout
BOOL, bool, Boolean, NSCFBoolean
- BOOL bool Boolean NSCFBoolean
- BOOLBooleanboolNSCFBoolean
- BOOL VS Boolean
Protocols and delegates
- Protocols and Delegates
- Implementation of Protocols and Delegation mechanism.
XML Parsing
- XML parsing
- XML Parsing
Declare class method and instance method
- Declare class method and instance method
- How to declare class method and instance method.
Predefined macros
- Predefined Macros
- Predefined Macros
NSCache
- NSCache
- NSCache
Grand Central Dispatch (GCD)
- Grand Central Dispatch
- What is Grand central dispatch.
Continue and break
- Continue and Break
- Continue and Break Statement
Format specifiers
- Format-Specifiers
- Integer Example - i
NSObject
- NSObject
- NSObject
Modern Objective-C
- Modern Objective-C
- Literals
- Container subscripting
NSUserDefaults
- NSUserDefaults
- Simple example
- Clear NSUserDefaults
Contributors

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