Memorize Game
Stanford University's course CS193p (Developing Applications for iOS using SwiftUI)
About the game
You need to turn over the cards one by one to find the same cards. When you find two identical cards, you get one point and these cards will disappear. The game ends when you find all the pairs.
Technology
- Swift
- SwiftUI
- MVVM
Screenshots
Sample code
MemoryGame.swift
struct Card: Identifiable {
var isFaceUp: Bool = false {
didSet {
if isFaceUp {
startUsingBonusTime()
} else {
stopUsingBonusTime()
}
}
}
var isMatched: Bool = false {
didSet {
stopUsingBonusTime()
}
}
var content: CardContent
var id: Int
// can be zero which means "no bonus available" for this card
var bonusTimeLimit: TimeInterval = 10
// how long this card has ever been face up
private var faceUpTime: TimeInterval {
if let lastFaceUpDate = self.lastFaceUpDate {
return pastFaceUpTime + Date().timeIntervalSince(lastFaceUpDate)
} else {
return pastFaceUpTime
}
}
// the last time this card was turned face up (and is still face up)
var lastFaceUpDate: Date?
// the accumulated time yhis card has been face up in the past
// (i.e. not including the current time it`s been face up if it is currently so)
var pastFaceUpTime: TimeInterval = 0
// how much time left before the bonus opportunity runs out
var bonusTimeRemaining: TimeInterval {
max(0, bonusTimeLimit - faceUpTime)
}
// percentage of the bonus time remaining
var bonusRemaining: Double {
(bonusTimeLimit > 0 && bonusTimeRemaining > 0) ? bonusTimeRemaining/bonusTimeLimit : 0
}
// whether the card was matched during the bonus time period
var hasEarnedBonus: Bool {
isMatched && bonusTimeRemaining > 0
}
// whether we are currently face up, unmatched and have not yet used up the bonus window
var isConsumingBonusTime: Bool {
isFaceUp && !isMatched && bonusTimeRemaining > 0
}
// called when the card transitions to face up state
private mutating func startUsingBonusTime() {
if isConsumingBonusTime, lastFaceUpDate == nil {
lastFaceUpDate = Date()
}
}
// called when the card goes back face down (or gets matched)
private mutating func stopUsingBonusTime() {
pastFaceUpTime = faceUpTime
self.lastFaceUpDate = nil
}
}
About the course
Stanford's CS193p course, Developing Applications for iOS, explains the fundamentals of how to build applications for iPhone and iPad using SwiftUI.
Stanford University's course CS193p (Developing Applications for iOS using SwiftUI)
Lectures
- Course Logistics and Intro to SwiftUI
- MVVM and the Swift Type System
- Reactive UI Protocols Layout
- Grid enum Optionals
- ViewBuilder Shape ViewModifier
- Animation
- Multithreading EmojiArt
- Gestures JSON
- Data Flow
- Modal Presentation and Navigation
- Enroute Picker
- Core Data
- Persistence
- UIKit Integration
Requirements
- iOS 14.2
- Xcode 12.0
- Swift 5.3
Install
Just open project and run
