atierian

Architecture

• Doordash mobile architecture
• Evernote rewrite mobile app
• Scaling up an iOS app using modules

Offline Sync and Cache

• Dropbox photo offline sync
• Airbnb message sync
• Netflix download
• Trello offline works
• Expedia API cache

IanKeen

import Combine
import SwiftUI

extension View {
    public func focused<T>(file: StaticString = #file, _ state: FocusState<T>, equals value: T) -> some View {
        modifier(FocusedModifier(state: state, id: value, file: file))
    }
}

@propertyWrapper

IanKeen

import SwiftUI

extension View {
    public func discover<T: UIView>(
        tag: Int = .random(in: (.min)...(.max)),
        where predicate: @escaping (T) -> Bool = { _ in true },
        _ closure: @escaping (T) -> Void
    ) -> some View {
        self.overlay(
            DiscoveryView(tag: tag)

tykurtz

GROKKING NOTES

I liked the way Grokking the coding interview organized problems into learnable patterns. However, the course is expensive and the majority of the time the problems are copy-pasted from leetcode. As the explanations on leetcode are usually just as good, the course really boils down to being a glorified curated list of leetcode problems.

So below I made a list of leetcode problems that are as close to grokking problems as possible.

Pattern: Sliding Window

• https://leetcode.com/problems/maximum-subarray/ # Close enough
• https://leetcode.com/problems/minimum-size-subarray-sum/

IanKeen

@propertyWrapper
struct AppStorage<Value>: DynamicProperty {
    let key: String
    let defaultValue: Value

    init(wrappedValue defaultValue: Value, _ key: String) {
        self.key = key
        self.defaultValue = defaultValue
        self._wrappedValue = State(wrappedValue: UserDefaults.standard.object(forKey: key) as? Value ?? defaultValue)
    }

IanKeen

struct Value {
    var foo: Int
    @Indirect var inner: Value?
}

let x = Value(foo: 1, inner: .init(foo: 2, inner: .init(foo: 3, inner: nil)))
x.inner?.inner?.foo // 3

IanKeen

@propertyWrapper
struct Redraw<Value> {
    var wrappedValue: Value

    init(wrappedValue: Value) {
        self.wrappedValue = wrappedValue
    }

    static subscript<Instance: UIView>(
        _enclosingInstance instance: Instance,

mattt

import UIKit

#if canImport(SwiftUI) && DEBUG
import SwiftUI
struct UIViewControllerPreview<ViewController: UIViewController>: UIViewControllerRepresentable {
    let viewController: ViewController

    init(_ builder: @escaping () -> ViewController) {
        viewController = builder()
    }

IanKeen

public struct AnyCodable: Codable {
    public let value: Any?
    
    public init(_ value: Any?) {
        self.value = value
    }
    
    public init(from decoder: Decoder) throws {
        let container = try decoder.singleValueContainer()
        

Jpunt

# When using RN in combination with Cocoapods, a lot of 
# things are broken. These are the fixes we had to append 
# to our Podfile when upgrading to ReactNative@0.55.3.
# 
# WARNING: Check those line numbers when you're on a different version!

def change_lines_in_file(file_path, &change)
  print "Fixing #{file_path}...\n"

  contents = []