Swift Introduction

Key Value
Current Swift Version 4.2
Current XCode Version 9.4 / 10 Beta

Reading Resources:

  • https://swift.org/

  • https://github.com/iwasrobbed/Swift-CheatSheet

  • https://github.com/vsouza/awesome-ios
  • https://github.com/matteocrippa/awesome-swift
  • https://www.raywenderlich.com/151741/macos-development-beginners-part-1

Development Setup

  • Mac Devices [Mac, iOS]
  • XCode => https://developer.apple.com/download/more/
  • CocoaPods => https://cocoapods.org/
# CocoaPods setup:
brew install cocoapods
brew cask install cocoapods-app
pod setup # this might take a while..

# Create a XCode Project and
# define your project directory:
export PROJECT_DIR=~/Repositories/xcode/Demo
mkdir -p $PROJECT_DIR && cd $PROJECT_DIR

# init CocoaPods for your project by creating an empty file
touch Podfile

cat > Podfile << EOF
# specify the platform + version 
# you want to support
platform :osx, '10.10'

# When using Swift, we can do dynamic frameworks:

# specify a target:
target 'Demo' do
  # Include SwiftyJSON, a nice JSON Library
  pod 'SwiftyJSON', '~> 4.1'

# Install Dependencies:
pod install

# Open newly created workspace:
open Demo.xcworkspace

Java → Swift

  • Class Definitions
Java Swift
public MyClass { ... } class MyClass { ... }
public Interface MyInterface protocol MyProtocol { ... }
public SubClass extends MyClass { ... } class SubClass : MyClass { ... }
  • Access Modifier
Java 8 Swift 4 Visibility
open Classes declared as open can be subclassed outside a module
public public Within the same Project
protected internal (=default) Within the same Package/Module
no modifier (=default) no modifier (=internal) Within the same Package/Folder
fileprivate Within the source file
private private Within the enclosing declaration
  • Swift: Access Control
Modifier Class Subclass File Module World World++
open :white_check_mark: :white_check_mark: :white_check_mark: :white_check_mark: :white_check_mark: :white_check_mark:
public :white_check_mark: :white_check_mark: :white_check_mark: :white_check_mark: :white_check_mark: :x:
internal :white_check_mark: :white_check_mark: :white_check_mark: :white_check_mark: :x: :x:
fileprivate :white_check_mark: :white_check_mark: :white_check_mark: :x: :x: :x:
private :white_check_mark: :white_check_mark: :x: :x: :x: :x:

Note: World++ means that our Classes/Methods can be overridden/extended from outsid our module.