chriseidhof

//
//  ContentView.swift
//  KeyFrameAnimation
//
//  Created by Chris Eidhof on 21.10.19.
//  Copyright © 2019 objc.io. All rights reserved.
//

import SwiftUI

chriseidhof

//
//  ContentView.swift
//  Shake
//
//  Created by Chris Eidhof on 01.10.19.
//  Copyright © 2019 Chris Eidhof. All rights reserved.
//

import SwiftUI

chriseidhof

//
//  ContentView.swift
//  AnimationTimingCurve
//
//  Created by Chris Eidhof on 25.09.19.
//  Copyright © 2019 Chris Eidhof. All rights reserved.
//

import SwiftUI

chriseidhof

struct ContentView: View {
    @State var prop: Bool = true
    var body: some View {
        VStack {
            Rectangle()
            .fill(prop ? Color.red : Color.green)
            .frame(width: prop ? 100 : 300, height: prop ? 50 : 200)
                .animation(.linear)
            Spacer()
            Toggle(isOn: $prop, label: { Text("Toggle") })

chriseidhof

//
//  ContentView.swift
//  CollectionView
//
//  Created by Chris Eidhof on 20.08.19.
//  Copyright © 2019 Chris Eidhof. All rights reserved.
//

import SwiftUI

chriseidhof

//
//  ContentView.swift
//  SwiftTalkAnimationLoader
//
//  Created by Chris Eidhof on 30.07.19.
//  Copyright © 2019 Chris Eidhof. All rights reserved.
//

import SwiftUI

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import Foundation

struct Episode: Codable { }
struct EpisodeDetail: Codable { }

// episodes.json returns an [Episode]
// /episodes/foo should be (String) -> EpisodeDetail

enum Either<A, B> {
    case left(A)

chriseidhof

My understanding of SwiftUI

• The main advantage of SwiftUI over UIKit is to write both your initial UI rendering as well as any updates to your UI in one go.
• On a very abstract level, this is similar to TEA, but practically, it's quite different: updates in SwiftUI are incremental, and for many things there's no diffing necessary.

In SwiftUI, you define your views as structs that conform to View. The View protocol has a single requirement: you need to implement body, a computed property that returns another type conforming to View.

Just like normal structs in Swift, you can use properties anywhere inside your View. However, unlike normal structs, some properties are special. Specifically, properties that are defined using the property wrappers EnvironmentObject, ObjectBinding, State (and some others). When SwiftUI renders the body, it will subscribe to these properties. When these properties change, they send a notification, and SwiftUI will re-render the necessary parts. I call thes

chriseidhof

final fileprivate class Weak<A: AnyObject> {
    weak var value: A?
    init(_ value: A) {
        self.value = value
    }
}

final class ImageManager {
    fileprivate var values: [URL:Weak<Resource<UIImage>>] = [:]
    

chriseidhof

import SwiftUI
import Combine

final class Test: BindableObject {
    let subject = PassthroughSubject<(), Never>()
    private(set) var didChange: AnyPublisher<(), Never> = Publishers.Empty().eraseToAnyPublisher()
    var value: String = "Hi"
    
    init() {
        print("Init")