iOS - Swift Reference

This is a playground that I made based on the Apple Swift documentation and then I added some samples of general code like Notifications, JSON Serialization and REST Requests. This project requires XCode 7.

Feel free to take a look and if you want to add something, pull requests are welcome :)

Contents

Constants and Variables

• Constants
• Variables
• Type Annotations
• Emoji Names
• Printing
• Comments
• Integer
• Float
• Double
• Boolean
• String
• Tuples
• Type aliases
• Converting types

Operators and Comparison

• Assignment
• Arithmetic
• Increment and Decrement
• Unary Minus
• Compound Assignment
• Binary Comparison
• Logical NOT
• Logical AND
• Logical OR
• Compound
• Ternary Conditional
• Switch
• Switch With Interval Matching
• Switch With Tuples
• Switch Value Bindings
• Switch Where
• Switch Fallthrough
• Checking API Availability

Optionals

• Declaration
• Unwrapping
• Can set nil
• Testing
• Optional Binding
• Nil Coalescing

Strings and Characters

• String Literals
• Empty String
• Mutability and Concatenation
• Interpolation
• Characters
• Counting Characters
• Indices
• Inserting and Removing
• Comparing
• Prefix and Suffix Equality
• UTF-8, UTF-16 and Scalar Representation

Arrays

• Empty Array
• Array with a Default Value
• Adding Two Arrays Together
• Array with an Array Literal
• Array Count
• Check if it is Empty
• Modifying an Array
• Iterating Over an Array
• Sorting Arrays
• Sorting Tuples/Objects

Sets

• Empty Set
• Set with an Array Literal
• Set Count
• Check if it is Empty
• Modifying a Set
• Iterating Over a Set
• Sorting Sets - Returns Array
• Set Operations
• Membership and Equality
• Is Equal
• Is Subset Of
• Is Superset Of
• Is Disjoint With - does not have any values in common

Dictionaries

• Empty Dictionary
• Dictionary with a Dictionary Literal
• Dictionary Count
• Check if it is Empty
• Modifying a Dictionary
• Iterating Over a Dictionary
• Get Dictionary List

Loops

• For-In - Closed Range
• For-In - Half-Open Range
• For-In - Don't need to declare index
• For-In - Iterating Over an Array
• For-In-Where - Iterating Over an Array where element meets condition
• For-In - Iterating Over a Dictionary
• For
• While
• Repeat-While
• Continue - go to the next index
• Break - stop the loop or switch
• Labeled Loop

Predicates

• Equal
• Not
• Less
• Variables Substitution
• Between
• Compound Predicates
• String BEGINSWITH
• String CONTAINS
• String ENDSWITH
• String LIKE
• String MATCHES
• IN
• Block Predicate

Functions

• Defining and Calling Functions
• Single Parameter
• Multiple Parameters
• Specifying External Parameter Names
• Omitting External Parameter Names
• Default Parameter Values
• Variadic Parameters
• Variable Parameters
• In-Out Parameters
• Return Values
• Optional Return Value
• Multiple Return Values - Tuple
• Function Types
• Function Types as Parameter Types
• Function Types as Return Types
• Nested Functions

Closures

• The Sort Method
• Inferring Type From Context
• Implicit Returns from Single-Expression Closures
• Shorthand Argument Names
• Operator Functions
• Trailing Closures
• Capturing Values
• Closures Are Reference Types
• Autoclosures
• Escaping - Using variables from outside the closure

Enumerations

• Enumeration Syntax
• Matching Enumeration Values with a Switch Statement
• Associated Values
• Raw Values
• Implicitly Assigned Raw Values
• Initializing from a Raw Value
• Recursive Enumerations
• If Case (Enumeration Case Pattern)

Structures

• Definition Syntax
• Structure Instances
• Accessing Properties
• Structures Are Value Types
• Methods

Classes

• Classes Are Reference Types
• Lazy Stored Properties
• Computed Properties
• Read-Only Computed Properties
• Property Observers
• Type Property
• Singleton
• Instance Methods
• Local and External Parameter Names for Methods
• Type Methods
• Initialization
• Deinitialization
• Subscripts
• Inheritance
• Overriding Methods
• Overriding Properties
• Overriding Property Observers
• Preventing Overrides
• Optional Property Types
• Weak References
• Unowned References

Error Handling

• Representing Errors
• Propagating Errors Using Throwing Functions
• Handling Errors Using Do-Catch
• Using methods with NSError
• Converting Errors to Optional Values
• Disabling Error Propagation
• Specifying Cleanup Actions

Type Casting

• Defining a Class Hierarchy for Type Casting
• Checking Type
• Downcasting
• Type Casting for AnyObject
• Type Casting for Any

Nested Types

• Nested Types in Action
• Referring to Nested Types

Extensions

• Computed Properties
• Initializers
• Methods
• Mutating Instance Methods
• Subscripts
• Nested Types

Protocols

• Property Requirements
• Method Requirements
• Initializer Requirements
• Delegation
• Adding Protocol Conformance with an Extension
• Collections of Protocol Types
• Protocol Inheritance
• Class-Only Protocols
• Protocol Composition
• Checking for Protocol Conformance
• Optional Protocol Requirements
• Protocol Extensions
• Adding Constraints to Protocol Extensions

Generics

• Generic Functions
• Generic Types
• Extending a Generic Type
• Type Constraints
• Associated Types
• Extending an Existing Type to Specify an Associated Type
• Where Clauses

Access Control

• Access Control Syntax
• Custom Types
• Enumeration Types
• Subclassing
• Constants, Variables, Properties, and Subscripts

Advanced Operators

• Bitwise NOT Operator
• Bitwise AND Operator
• Bitwise OR Operator
• Bitwise XOR Operator
• Bitwise Left and Right Shift Operators
• Overflow Operators
• Operator Functions
• Prefix and Postfix Operators
• Compound Assignment Operators
• Equivalence Operators
• Custom Operators
• Precedence and Associativity for Custom Infix Operators

Date and Time

• Creating Date Objects
• Test Equal Dates
• Test Earlier Date
• Test Later Date
• Test if the difference is less than 60 seconds
• Calendar Basics
• Create a Date from Components
• Extracting Components from Date
• Converting from One Calendar to Another
• Adding Components to a Date
• Getting the difference between two dates
• Creating Time Zones
• Changing Time Zone
• Daylight Saving Time
• Date Formatter

Notification Center

• Adding and Removing Observer for a Notification
• Posting a Notification
• Executing

Key Value Observing

• Contexts
• Observable Properties
• Handle observing

JSON Serialization

• JSON Data
• Serialization

REST Request

• Creating a Manager
• Executing and Canceling

Operations

• Block Operation
• Priority and Quality of Service
• Custom Operation
• Main and Current Queue
• Operation Queue
• Cancelling Operations
• Dependencies

Grand Central Dispatch

• Global Concurrent Dispatch Queues
• Getting Main Queue at Runtime
• Creating Serial Dispatch Queues
• Synchronous Task
• Asynchronous Task
• Barrier Synchronous Task
• Barrier Asynchronous Task
• Getting back to the main queue
• Suspending and Resuming Queues
• Dispatch at the specified time
• Dispatch queue for multiple invocations
• Dispatch once and only once for the lifetime of an application
• Using Dispatch Semaphores to Regulate the Use of Finite Resources
• Waiting on Groups of Queued Tasks

Functional Programming

• Filtering
• Reducing
• Mapping
• FlatMap
• Combining uses

Timers

• Scheduled Timer on the current NSRunLoop
• Scheduled Timer With Repetition
• Scheduling Timers Manually
• Scheduling Timers Manually With Fire Date
• Firing Timers Manually

File Manager

• Bundle Directory
• Documents Directory
• Documents/Inbox Directory
• Library Documents
• Temporary Dicrectory
• File Manager
• Contents of a directory
• Filter by file extension
• Check if directory or file exists
• Creating a directory
• Writing and Reading String Files
• Deleting a File
• Directory or File Attributes
• File Manager Delegate

User Defaults

• Shared Instance
• Bool Values
• Integer Values
• Float Values
• Double Values
• String Value
• Array Value
• Dictionary Value
• Data Value
• URL Value
• Removing Defaults
• Synchronyze
• Notifications

Core Data

• Entities
• Attributes
• Relationships
• Entities Properties
• Managed Object Model
• Persistent Store Coordinator
• Managed Object Context
• Child Managed Object Context for Multithreading
• Managed Objects
• Notifications
• Saving Context
• Fetch Request
• Subclassing