Download Xcode 9
Swift Cheatsheet
Xcode Keyboard Shortcuts
Xcode Installation Issues
iPhone Resolution
App Icon Dimension and Requirements
Apple's Human Interface Guidelines
A Brief History of Graphics
Troubleshoot Swift Sdtilib Tool Error
Other Resources:
Hackintosh
Error Handling
Check Error
Global and Local Variables
iOS 12 Resource List
Property List (plist)
UIKit
Foundation
Swift Standard Library
