swift.md

2020

Apps

• A Best in Class iOS App

Auto Layout

• The Auto Layout Comprehendium

Combine

• Using Combine

Crash reporting

• MetricKit Crash Reporting

Libraries

• EnvironmentOverrides
• Xcode build times visualization per target
• Build Time Analyzer for Swift

Performance

• iOS Performance tips you probably didn't know (from an ex-Apple engineer)

Swift

• as, as?, and as!

SwiftUI

• SwiftUI View Lifecycle
• How an Hstack Lays out Its Children
• Handling deeplinks in iOS 14 with onOpenURL
• All SwiftUI property wrappers explained and compared
• Programmatic navigation in SwiftUI project
• The Complete SwiftUI Documentation You’ve Been Waiting For

Xcode

• iOS main in Assembly
• Navigating Xcode 12 and Tabs
• You Should All Build This Custom Instrument for Your App
• 3 steps to speed up storyboard
• Xcode Build Settings
• The Unofficial Guide to xcconfig files
• Xcode Build Time Optimization Part 1 Part 2

Xcode shortcuts

• Go Back to Where the Cursor Is: ⌥ + ⌘ + L
• Copy Qualified Symbol Name: ⌘ + ⇧ + ⌥ + ⌃ + C
• Fix All Errors In-Scope: ⌃+ ⌥ + ⌘ + F
• Jump to Definition: ⌃ + ⌘ + J
• Find Call Hierarchy: ⇧ + ⌃ + ⌘ + H
• Search & Replace in the whole project: ⇧ + ⌥ + ⌘ + F

2019

Automation

• swift-format
• SwiftLint
• IBLinter
• ScanCode
• periphery
• xiblint
• xcassetscop
• ibcolortool
• xcprojectlint
• XcodeGen
• mergepbx
• xcperfect
• xcderiveddata
• LibFuzzer
• SwiftMonkey
• xcparse

Xcode

• open on GitHub

Before 2019

Debugging

• Hopper + lldb for iOS Developers: A Gentle Introduction
• Investigating the Cause of Quadratic Time Complexity When Adding Subviews in UIKit
• Dancing in the Debugger — A Waltz with LLDB
• Memory Graph Debugger Tips
• Swizzling in iOS 11 with UIDebuggingInformationOverlay

Design

• The iOS Design Guidelines
• Size classes

Development

• When to Avoid Third Party Libraries

Foundation

• Big-O Notation and Swift collection data structures

Programming

• Covariance and Contravariance

SDK

• API Reference

Shortcuts

• ⌃⌥⌘F in Xcode to apply all fix-its in the current scope.

Snippets

• Xcode build duration
  defaults write com.apple.dt.Xcode ShowBuildOperationDuration -bool YES
• Xcode reload plugins
  defaults delete com.apple.dt.Xcode DVTPlugInManagerNonApplePlugIns-Xcode-X.X.X
• Better autocompletion with Fuzzy mode?
  defaults write com.apple.dt.Xcode IDECodeCompletionFuzzyMode 3
defaults write com.apple.dt.Xcode IDEWorkaroundForRadar6288283 3
• Faster build times by leveraging multi-core CPU
  defaults write com.apple.dt.Xcode IDEBuildOperationMaxNumberOfConcurrentCompileTasks `sysctl -n hw.ncpu`
• Flag to emit warnings whenever a function takes longer than some threshold to compile. Add the following to Other Swift Flags
  • -Xfrontend
  • -warn-long-function-bodies=100, where 100 is the number of milliseconds you’d like the warning threshold to be
• More information about why build commands are run defaults write http://com.apple .dt.Xcode ExplainWhyBuildCommandsAreRun -bool true
• To enable warn about individual expressions that take a long time to type check, go the Build Settings, “Swift Compiler - Custom Flags”, “Other Swift Flags”, and add: -Xfrontend -warn-long-expression-type-checking=<limit> where <limit> is the lower limit of the number of milliseconds that an expression must take to type check in order for the warning to be emitted.
• An experimental opt-in feature increases the number of concurrent build tasks that are run for Swift projects. This may improve build times for Swift projects, but may also increase memory use during the build: defaults write com.apple.dt.Xcode BuildSystemScheduleInherentlyParallelCommandsExclusively -bool NO

Swift

• The Swift ABI
• Lenses in Swift
• Swift Package Manager
• Swift Package Manager Usage
• Reference counted releases in Swift
• Unsafe Swift
• Swift Intermediate Language (SIL)
• Swift Keywords (3.0.1)

Testing

• How to Do XCTestCase tearDown Wrong …and Right
  • TLDR Every object you create in setUp should be destroyed in tearDown.
• XCTest Waiting
• UI Testing with Stubbed Network Data
• XCUIApplication

Videos

• Building a User-Centric Security Model in iOS Applications

Xcode

• Xcode Build System
• NSUserDefaults
• Speeding Up Slow Swift Build Times
• Xcode Search: the Hidden Gems
• Multiplatform, Single-scheme Xcode Projects
• Xcode 8 extensions
• Migrating Code Signing Configurations to Xcode 8
• Stop Xcode 8 simulator logging
• The Unofficial Guide to xcconfig files
• Better Xcode Run Script Build Phases
• iOS Simulator Power Ups
• Modular Xcode Projects
• FILEHEADER
• Useful URL schemes in Xcode 9