Simple iOS Performance Tips

27 February 20201 March 2020 patmcgLeave a comment

A former  engineer gives us “a checklist of performance tips that would hopefully give you the biggest bang for your buck.”

I have noticed that there was a pattern of low-hanging fruits, where you could make 80% of the performance gains in 20% of the time.

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

Cheat sheet:

UILabel costs more than than you think
Always start with serial queues, and only use concurrent queues as a last resort
Some system components will only free up memory when they receive a memory warning
Avoid using dispatch_semaphore_t to wait for asynchronous work
Don’t use UIView tags

Via iOS Dev Weekly.

Software Dev

Swift’s Closure Capturing Mechanics

27 February 202025 February 2020 patmcgLeave a comment

This post runs through the mysteries and complexities of Swift closure variable capturing. It’s a tricky topic: implicit capturing, capture lists, weak references, capturing values, unowned references… 🤯 all well-covered here.

👉 Swift’s closure capturing mechanics

Via iOS Dev Weekly.

Software Dev

State Machines in SwiftUI

26 February 202026 February 2020 patmcgLeave a comment

An app view that changes its state in complicated ways is difficult to do right. We developers have even been trying to avoid state when possible. But if you really just have to deal with a complex state-driven app view, then embrace it with a state machine.

👉 Building a state-driven app in SwiftUI using state machines

Honestly, this is my favorite programming technique, where the really interesting stuff happens. 👍