Milen Halachev KoCMoHaBTa

On OS X the Packed Pixels display won't automatically show up as "Retina" or "HiDPI" resolution, instead the OS will use the full resolution of the display making everything tiny. This can be changed using the 3rd party app (non-free) SwitchResX.

First, download SwitchResX.

You can play with the resolutions for the Packed Pixels which is probably listed as Color LCD (2). However not all of the HiDPI resolutions work due to an OS X bug. If you are happy with any of the ones that do work then stop here, else continue.

If you're on El Capitan or later you need to disable System Integrity Protection (temporarily) to add a custom resolution for Packed Pixels. Follow the instructions from SwitchResX creator.

Now add a Custom Resolution that is "scaled". It must be 2 pixels bigger or smaller than the native resolution in one direction (this is the OS X quirk). I found bigger makes it slightly blurry so go w

PS: If you liked this talk or like this concept, let's chat about iOS development at Stitch Fix! #shamelessplug

Protocol-Oriented Programming in Swift

Speaker: David Abrahams. (Tech lead for Swift standard library)

"Crusty" is an old-school programmer who doesn't trust IDE's, debuggers, programming fads. He's cynical, grumpy.
OOP has been around since the 1970's. It's not actually new.
Classes are Awesome
- Encapsulation
- Access control

	import SwiftUI
	import Combine

	public struct ChangeObserver<V: Equatable>: ViewModifier {
	public init(newValue: V, action: @escaping (V) -> Void) {
	self.newValue = newValue
	self.newAction = action
	}

	private typealias Action = (V) -> Void

	import SwiftUI
	import Combine

	/// The idea is to use State to create a storage object which will be
	/// cached and restored by the framework. Then during the update phase we
	/// re-inject the object into a nested ObservableObject and subscribe to the
	/// ObjectType’s objectWillChange to forward to the _MessageForwarder’s
	/// objectWillChange which is already subscribed by the framework as it’s an
	/// inner dynamic property of our custom PW which is also a dynamic property.
	@propertyWrapper

	func animation(from notification: Notification) -> Animation? {
	guard
	let info = notification.userInfo,
	let duration = info[UIResponder.keyboardAnimationDurationUserInfoKey] as? Double,
	let curveValue = info[UIResponder.keyboardAnimationCurveUserInfoKey] as? Int,
	let uiKitCurve = UIView.AnimationCurve(rawValue: curveValue)
	else {
	return nil
	}

	let styles: [UIFont.TextStyle] = [
	// iOS 17
	.extraLargeTitle, .extraLargeTitle2,
	// iOS 11
	.largeTitle,
	// iOS 9
	.title1, .title2, .title3, .callout,
	// iOS 7
	.headline, .subheadline, .body, .footnote, .caption1, .caption2,
	]