Modernizing Grand Central Dispatch Usage - WWDC 2017 - Videos - Apple Developer

macOS 10.13 and iOS 11 have reinvented how Grand Central Dispatch and the Darwin kernel collaborate, enabling your applications to run...

developer.apple.com

Concurrent Programming With GCD in Swift 3 - WWDC 2016 - Videos - Apple Developer

Swift 3 provides new interfaces that make it easier than ever to write applications with Grand Central Dispatch. Learn the basics of GCD...

developer.apple.com

Mastering Grand Central Dispatch - WWDC 2011 - Videos - Apple Developer

Grand Central Dispatch is a powerful technology on Mac OS X and iOS that simplifies multi-threaded development. Learn about the latest...

developer.apple.com

System Trace in Depth - WWDC 2016 - Videos - Apple Developer

Join engineers from the Instruments team for another focused look at the System Trace Instruments profiling template and how to get the...

developer.apple.com

Concurrency in Swift: Reader Writer Lock

When it comes to protecting critical sections both Objective-C and Swift provide little to none language support. Luckily, we have tools to choose in frameworks. In this article I will demonstrate how to solve the readers-writers using GCD and pthread (POSIX threads) in Swift.

medium.com

Leaky abstractions in Swift with DispatchQueue

At Q42 we have some apps with very occasional weird multi-threading issues. After a bunch of debugging Mathijs Kadijk and I figured out it had something to do with DispatchSpecificKey. This post details what we found out. Pop quiz! What do you think this prints?

tom.lokhorst.eu

Introducing Swift Atomics

I'm delighted to announce Swift Atomics, a new open source package that enables direct use of low-level atomic operations in Swift code. The goal of this library is to enable intrepid systems programmers to start building synchronization constructs (such as concurrent data structures) directly in Swift.

swift.org

Making efficient use of the libdispatch (GCD)

The libdispatch is one of the most misused API due to the way it was presented to us when it was introduced and for many years after that, and due to the confusing documentation and API. This page is a compilation of important things to know if you're going to use this library.

gist.github.com

Designing for iOS: Graphics & Performance

Note: Even though the technology stack in iOS remained largely unchanged, the hybrid approach described further below in this article is overkill by today's standards. If you want to take a fresher look at designing iOS interfaces using Xcode and Swift, check out the newBuilding iOS Interfaces series.

thoughtbot.com

Some Important Aspects of UIKit Performance

As we know from a Google report on micro-moments, 70 percent of people abandon an app when it takes too long to load. That's why your app has to be smooth and slick. UIKit performance optimization is one of the major ways to ensure that.

yalantis.com

iOS Memory Deep Dive - WWDC 2018 - Videos - Apple Developer

Discover how memory graphs can be used to get a close up look at what is contributing to an app's memory footprint. Understand the true...

developer.apple.com

Image and Graphics Best Practices - WWDC 2018 - Videos - Apple Developer

Whether it's for UI elements or a fundamental part of your application, at some point, you have to handle images. This session is packed...

developer.apple.com

iOS images in memory

Notes for wwdc2018/219 and wwdc2018/416 It is obvious that too much usage of CPU has negative impact on battery life and responsiveness. But, if you application consumes too much memory, that causes more CPU utilization, which have negative effects on battery life and performance.

suelan.github.io

Working with Wide Color - WWDC 2016 - Videos - Apple Developer

Discover the fascinating details behind the display of color on Apple platforms. Go beyond the basics and learn how your apps can take...

developer.apple.com

Explore UI animation hitches and the render loop - Tech Talks - Videos - Apple Developer

Explore how you can improve the performance of your app's user interface by identifying scrolling and animation hitches in your app...

developer.apple.com

Demystify and eliminate hitches in the render phase - Tech Talks - Videos - Apple Developer

When you implement complex view hierarchies in your app, you may run into animation hitches. Demystify how your views are turned into...

developer.apple.com

Find and fix hitches in the commit phase - Tech Talks - Videos - Apple Developer

Discover how to render smoother animations in your app by troubleshooting the commit phase of your render loop. Dive into the mechanics...

developer.apple.com

Getting Pixels onto the Screen

How does a pixel get onto the screen? There are many ways to get something onto the display and they involve many different frameworks and many different combinations of functions and methods. Here we'll walk through some of the things that happen behind the scenes.

www.objc.io

Corner Rounding

When it comes to corner rounding, many developers stick with CALayer's .cornerRadius property. Unfortunately, this convenient property greatly taxes performance and should only be used when there is no alternative. This post will cover: Why is .cornerRadius so expensive?

texturegroup.org

Toggling iOS Render Debug Options Without a Computer - Bryce Pauken

Have you ever been away from your computer, playing around with a feature on your app, and spot a performance issue that you want to get some insights into right at that moment? Some of the tools that we depend on for debugging these issues, like Instruments, are sufficiently powerful that I don't blame them for requiring a separate machine to use.

Practical Drawing for iOS Developers - WWDC 2011 - Videos - Apple Developer

Come learn about all the amazing things you can do with Core Graphics. In this talk you learn from seasoned Apple engineers how to use...

developer.apple.com

Image and Graphics Best Practices - WWDC 2018 - Videos - Apple Developer

Whether it's for UI elements or a fundamental part of your application, at some point, you have to handle images. This session is packed...

developer.apple.com

CATransaction in Depth

CATransaction is a class that is often overlooked by many iOS developers despite offering many useful functions for controlling and responding to animations. The documentation explains things fairly well, but this post's goal is to explore CATransaction in depth. In Core Animation, transactions are a way to group multiple animation-related changes together.

www.calayer.com

Large Image Downsizing

This code sample demonstrates a way to support displaying very large images in limited memory environments by turning a large image on disk into a smaller image in memory. This is useful in situations where the original image is too large to fit into memory as required for it to be displayed.

developer.apple.com

Apple Developer Documentation

developer.apple.com

Apple Developer Documentation

developer.apple.com

Layer-Backed Views: AppKit + Core Animation - WWDC 2012 - Videos - Apple Developer

Learn how to effectively use layer-backed views in AppKit to get smooth animations and fast performance. See how to take advantage of new...

developer.apple.com

Understanding Swift Performance - WWDC 2016 - Videos - Apple Developer

In this advanced session, find out how structs, classes, protocols, and generics are implemented in Swift. Learn about their relative...

developer.apple.com

apple/swift

The following document is a gathering of various tips and tricks for writing high-performance Swift code. The intended audience of this document is compiler and standard library developers. Some of the tips in this document can help improve the quality of your Swift program and make your code less error prone and more readable.

github.com

Safely manage pointers in Swift - WWDC 2020 - Videos - Apple Developer

Come with us as we delve into unsafe pointer types in Swift. Discover the requirements for each type and how to use it correctly. We'll...

developer.apple.com

RunLoop vs DispatchQueue as Scheduler

When using new Combine framework you can specify the scheduler on which to receive elements from the publisher. Is there a big difference between RunLoop.main and DispatchQueue.main in this case when assigning publisher to UI element? The first one returns the run loop of the main thread and the second queue associated with the main thread.

www.thetopsites.net

Run Loops

Run loops are part of the fundamental infrastructure associated with threads. A run loop is an event processing loop that you use to schedule work and coordinate the receipt of incoming events. The purpose of a run loop is to keep your thread busy when there is work to do and put your thread to sleep when there is none.

developer.apple.com

Introduction to Run Loops

Important: The information in this document is superseded by the information inThreading Programming Guide . For information about how to configure a run loop for your custom threads, see that document instead. Important The information in this document is superseded by the information in Threading Programming Guide .

developer.apple.com

Building Faster in Xcode - WWDC 2018 - Videos - Apple Developer

Build your apps faster in Xcode 10. Learn how to structure your projects and tweak your code to take full advantage of all processor...

developer.apple.com

Improving Your Build Time in Xcode 10

I finally had time to watch some of the WWDC talks related to Xcode 10 today, and I wanted to share some very interesting and useful new tips to improve the build times of Swift and Objective-C projects in Xcode 10.

patrickbalestra.com

Apple Developer Documentation

developer.apple.com

Xcode-Tips/xcode-tips.github.io

Any time I am exploring or getting familiar with a new codebase in Xcode, especially very large projects, I use disabled breakpoints as "bookmarks" to keep track of where I am, where I have been, and things I want to remember or need to revisit.

github.com