Legolas Wang legolasW

The introduction to Reactive Programming you've been missing

If you prefer to watch video tutorials with live-coding, then check out this series I recorded with the same contents as in this article: Egghead.io - Introduction to Reactive Programming.

	if let popoverController = alertController.popoverPresentationController {
	popoverController.sourceView = self.view
	popoverController.sourceRect = CGRect(x: self.view.bounds.midX, y: self.view.bounds.midY, width: 0, height: 0)
	popoverController.permittedArrowDirections = []
	}


	struct ViewControllerHolder {
	weak var value: UIViewController?
	init(_ value: UIViewController?) {
	self.value = value
	}
	}

	struct ViewControllerKey: EnvironmentKey {
	static var defaultValue: ViewControllerHolder { return ViewControllerHolder(UIApplication.shared.windows.first?.rootViewController ) }

	//------------------------------------------------------------------------
	// The SwiftUI Lab: Advanced SwiftUI Animations
	// https://swiftui-lab.com/swiftui-animations-part1 (Animating Paths)
	// https://swiftui-lab.com/swiftui-animations-part2 (GeometryEffect)
	// https://swiftui-lab.com/swiftui-animations-part3 (AnimatableModifier)
	//------------------------------------------------------------------------
	import SwiftUI

	struct ContentView: View {

	// Advanced SwiftUI Transitions
	// https://swiftui-lab.com
	// https://swiftui-lab.com/advanced-transitions

	import SwiftUI

	struct CrossEffectDemo: View {
	let animationDuration: Double = 2
	let images = ["photo1", "photo2", "photo3", "photo4"]
	@State private var idx = 0

	//
	// ListeningSiriAnimation.swift
	// SwiftUI Siri Animation

	//

	import SwiftUI

	struct ListeningSiriAnimation: View {
	@State var isRotating = false