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Xcode Defaults

Command Line

# Enable internal menu
defaults write com.apple.dt.Xcode ShowDVTDebugMenu -bool YES

# Enable project build time

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System Design Cheatsheet

Picking the right architecture = Picking the right battles + Managing trade-offs

Basic Steps

1. Clarify and agree on the scope of the system

• User cases (description of sequences of events that, taken together, lead to a system doing something useful)
  • Who is going to use it?
  • How are they going to use it?

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import SwiftUI

struct SphereView: View {
    @State var start = Date()
    
    func createPoint(at angle: Double, radius: Double, time: Double, center: CGPoint, pointSize: Double) -> (path: Path, color: Color) {
        let wobble = sin(time * 2 + radius / 10) * 10
        let distanceModifier = 1 + sin(angle * 3 + time) * 0.1
        let adjustedRadius = (radius + wobble) * distanceModifier
        

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//
//  DotGridView.swift
//

import SwiftUI

struct DotPosition: Equatable, Hashable {
    let row: Int
    let column: Int
}

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import SwiftUI
import Combine

struct CountdownView: View {
    let countdownSeconds: Int = 10
    let numberOfDivision: Int = 36
    let handSize: CGSize = .init(width: 8, height: 24)
    let radius: CGFloat = 100
    
    @State var count: Int = 10

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Bridging Native & React for iOS & Android

js -> native

• Simple Example
• Callbacks
• Promises
• Properties

native -> js

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import SwiftUI

struct HarmonicButton: View {
  var body: some View {
    Button(
      action: {},
      label: {}
    )
    .frame(width: 240.0, height: 70.0)
    .buttonStyle(HarmonicStyle())

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✅ REALITY FILTER — CHATGPT

• Never present generated, inferred, speculated, or deduced content as fact.
• If you cannot verify something directly, say:
  - “I cannot verify this.”
  - “I do not have access to that information.”
  - “My knowledge base does not contain that.”
• Label unverified content at the start of a sentence:
  - [Inference]  [Speculation]  [Unverified]
• Ask for clarification if information is missing. Do not guess or fill gaps.

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Displaying HDMI sources on Apple Vision Pro

While it's possible to stream most content to Apple Vision Pro directly over the internet, having the ability to use Apple Vision Pro as an HDMI display can still be useful.

Since Apple Vision Pro does not support connecting to an HDMI input directly or using an HDMI capture card, we have to be a little creative to make this work. NDI provides the ability to stream HDMI content over a local network with really low latency, and it works great with Apple Vision Pro.

This page shows the setup I’m using.

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✅ SwiftUI: Segmented “Pill” Control (Location / Settings)

A reusable SwiftUI component that matches the look in your screenshot: rounded “pill” container, sliding thumb, SF Symbols, bold active label, dimmed inactive.

import SwiftUI

// MARK: - Model
enum SegTab: String, CaseIterable, Identifiable {
    case location = "Location"