I've been looking at other questions/answers around this and I can't seem to find an answer thats worked for me. I'm making a game where you click a pizza and you generate money. You start off with only being able to generate one dollar through clicking but as you purchase Upgrades this number gains in value. In theory, when you click the level 1 upgrade button it will send a true value to the main game view, making a click earn 5 dollars instead of 1.
import UIKit
class GameViewController: UIViewController {
var wallet: Int = 0
var totalIncome: Int = 0
var level1UpgradeUsed: Bool = false
#IBOutlet weak var pizzaButton: UIButton!
#IBOutlet weak var labelWallet: UILabel!
override func viewDidLoad() {
super.viewDidLoad()
print(level1UpgradeUsed)
// Do any additional setup after loading the view.
}
#IBAction func pizzaClick(_ sender: Any) {
let upgrades = UpgradesViewController()
let level1UpgradeUsed = upgrades.level1used
if level1UpgradeUsed == true {
wallet = wallet + 4
}
wallet = wallet + 1
labelWallet.text = ("$" + String(wallet))
}
In the upgrades controller I'm trying to send the true value once the button is clicked
import UIKit
class UpgradesViewController: UIViewController {
public var level1used: Bool = false
public var level2used: Bool = false
public var level3used: Bool = false
public var level4used: Bool = false
var level5used: Bool = false
#IBOutlet weak var buttonLevel1: UIButton!
#IBOutlet weak var buttonLevel2: UIButton!
#IBOutlet weak var buttonLevel3: UIButton!
#IBOutlet weak var buttonLevel4: UIButton!
#IBOutlet weak var buttonLevel5: UIButton!
override func viewDidLoad() {
super.viewDidLoad()
// Do any additional setup after loading the view.
}
override func prepare(for segue: UIStoryboardSegue, sender: Any?) {
if let gameViewController = segue.destination as? GameViewController {
gameViewController.level1UpgradeUsed = self.level1used
}
}
#IBAction func Level1Click(_ sender: Any) {
if level1used == false{
buttonLevel1.backgroundColor = UIColor.gray
level1used = true
}
else {
}
}
Im geussing I'm not utilizing the TabBarController to pass data and not sure at all how to go about doing that. I'm new to swift and teaching myself everything so I'm sorry if this seems like a redundant question. It feels like it should be a lot simpler then it looks.
Related
I'm trying to create a Quiz app that consists of two buttons, false and true button. My question is, as I answer more questions in the app, I want the textLabel to keep track of my score. And then when I circle back to the first question again, it should reset. This is my code so far. I'm looking forward to your answers.
class ViewController: UIViewController {
#IBOutlet weak var questionLabel: UILabel!
#IBOutlet weak var progressBar: UIProgressView!
#IBOutlet weak var trueButton: UIButton!
#IBOutlet weak var falseButton: UIButton!
#IBOutlet weak var scoreLabel: UILabel!
var quizBrain = QuizBrain()
override func viewDidLoad() {
super.viewDidLoad()
updateUI()
progressBar.progress = 0.0
}
#IBAction func answerButtonPressed(_ sender: UIButton) {
let userAnswer = sender.currentTitle
let userGotItRight = quizBrain.checkAnswer(userAnswer!)
if userGotItRight {
sender.shortChangeTo(.green)
} else {
sender.shortChangeTo(.red)
}
quizBrain.nextQuestion()
DispatchQueue.main.asyncAfter(deadline: .now() + 0.1) {
self.updateUI()
}
}
func updateUI() {
questionLabel.text = quizBrain.getQuestionText()
trueButton.backgroundColor = UIColor.clear
falseButton.backgroundColor = UIColor.clear
progressBar.progress = 33
scoreLabel.text = "Score: \(quizBrain.getScore)"
}
}
You don't have any code for it yet? You can create a struct like user
struct user {
var score: Int = 0
mutating func answerRight (){
self.score =+ 1 }
mutating func reset (){
self.score = 0 }
}
But I see this in your code "Score: (quizBrain.getScore)"
This says that quizBrain should know the score. But you never add a value to it So check your quizBrain and create a function or an object that can track the score and then call it here "if userGotItRight {}"
I have an app where it is a marketplace and when you click on a product, it opens a detail view controller passing the data to display on the DetailVC. Additionally, inside the DetailVC, if you click on a button to claim the product, it segues to another VC to finalize the transaction.
In the DetailVC, there is a back button which is an unwind segue back to the main marketplace VC. Inside the TransactionVC, there is a cancel button which takes you back to the DetailVC.
When I am clicking the backButton in the DetailVC to take me back to the main market VC but I am getting a SIGBART Error and this :
020-07-15 09:05:23.707490-0500 evolutionatx[707:141952] Could not cast value of type 'evolutionatx.MarketplaceViewController' (0x1032c7868) to 'evolutionatx.PopUpPurchaseViewController' (0x1032c7ba8).
Here is the code for the DetailVC
import UIKit
import iCarousel
import CoreData
class MarketDetailViewController: UIViewController, UIScrollViewDelegate, iCarouselDelegate, iCarouselDataSource {
var productImageArray = [UIImage]()
var productVideo = String()
var pointsToPurchase = String()
var productName = String()
var productDescription = String()
var companyLogo = UIImage()
var companyWebsite = String()
var additionalProductImage = [UIImage]()
var companyName = String()
var promoCODE = String()
var buyLink = String()
var slides:[Slide] = [];
//IB
#IBOutlet weak var productNameLabel: UILabel!
#IBOutlet weak var productPriceLabel: UILabel!
#IBOutlet weak var productDescLabel: UILabel!
#IBOutlet weak var claimButton: UIButton!
#IBOutlet weak var imgScrollView: UIScrollView!
#IBOutlet weak var websiteButton: UIButton!
#IBOutlet weak var pageControl: UIPageControl!
#IBOutlet weak var logoDisplay: UIImageView!
#IBOutlet weak var carouselView: iCarousel!
#IBOutlet weak var otherProductslabe: UILabel!
var carouselImages = [UIImage]()
var evoCoin = Int()
override func awakeFromNib() {
super.awakeFromNib()
carouselImages = productImageArray
}
override func viewDidLoad() {
super.viewDidLoad()
valueSetter()
imgScrollView.delegate = self
slides = createSlides()
setupSlideScrollView(slides: slides)
pageControl.numberOfPages = slides.count
pageControl.currentPage = 0
view.bringSubviewToFront(pageControl)
}
}
func scrollViewDidScroll(_ scrollView: UIScrollView) {
let pageIndex = round(scrollView.contentOffset.x/view.frame.width)
pageControl.currentPage = Int(pageIndex)
let maximumHorizontalOffset: CGFloat = scrollView.contentSize.width - scrollView.frame.width
let currentHorizontalOffset: CGFloat = scrollView.contentOffset.x
// vertical
let maximumVerticalOffset: CGFloat = scrollView.contentSize.height - scrollView.frame.height
let currentVerticalOffset: CGFloat = scrollView.contentOffset.y
let percentageHorizontalOffset: CGFloat = currentHorizontalOffset / maximumHorizontalOffset
let percentageVerticalOffset: CGFloat = currentVerticalOffset / maximumVerticalOffset
}
#IBAction func claimProduct(_ sender: Any) {
print("tap rec")
claimProductandPurchase()
}
func claimProductandPurchase(){
evoCOiner()
if(evoCoin >= Int(pointsToPurchase)!){
print("Transaction Successful")
performSegue(withIdentifier: "proceedQuestion", sender: self)
}
else{
showToast(controller: self, message: "Insufficient EvoCoins", seconds: 0.5)
}
}
func showToast(controller: UIViewController, message : String, seconds: Double) {
let alert = UIAlertController(title: nil, message: message, preferredStyle: .alert)
alert.view.backgroundColor = UIColor.black
alert.view.alpha = 0.6
alert.view.layer.cornerRadius = 15
controller.present(alert, animated: true)
DispatchQueue.main.asyncAfter(deadline: DispatchTime.now() + seconds) {
alert.dismiss(animated: true)
}
}
func evoCoiner(){
let context = (UIApplication.shared.delegate as! AppDelegate).persistentContainer.viewContext
let request = NSFetchRequest<NSFetchRequestResult>(entityName: "EvoCoins")
request.returnsObjectsAsFaults = false
do{
let result = try context.fetch(request)
for data in result as! [NSManagedObject]
{
evoCoin = data.value(forKey: "evoCoins") as! Int
}
}catch{
print("Failed")
}
}
override func prepare(for segue: UIStoryboardSegue, sender: Any?) {
let detailController = segue.destination as! PopUpPurchaseViewController
detailController.ppromo = promoCODE
detailController.link = buyLink
detailController.coinToPurchase = Int(pointsToPurchase)!
}
//This is the unwind used by the transaction back button
#IBAction func unwindToItem(segue: UIStoryboardSegue) {
}
}
Here is the code in the transaction VC
import UIKit
import AMTabView
import CoreData
class MarketplaceViewController: UIViewController, TabItem {
#IBOutlet weak var sView: UIView!
#IBOutlet weak var evoCoinLabe: UILabel!
//For the sake of simplicity I only kept the Unwind functions
//MARK: - UNWIND FUNCTIONS
#IBAction func unwindToMainMarketView(segue: UIStoryboardSegue) {
}
}
How can I fix this error?
Please advise if my question was not clear or properly phrased (if so, sorry I am pretty new to all of this)
As #matt already said in his comment and the error clearly states, you cannot cast a MarketplaceViewController to a PopUpPurchaseViewController.
Furthermore instead of doing a forced cast, always look for a safe one like below. Doing so will prevent crashes.
if let detailController = segue.destination as? PopUpPurchaseViewController {
...
}
else {
// log failed to cast
}
import UIKit
import Combine
class ViewController: UIViewController {
#IBOutlet weak var allowMessageSwitch: UISwitch!
#IBOutlet weak var sendButton: UIButton!
#IBOutlet weak var messageLabel: UILabel!
#Published var canSendMessages: Bool = false
#Published var newMsg: String = ""
private var switchSubscriber: AnyCancellable?
private var btnSubscriber: AnyCancellable?
override func viewDidLoad() {
allowMessageSwitch.isOn = false
super.viewDidLoad()
setupProcesscingChain()
}
func setupProcesscingChain() {
switchSubscriber = $canSendMessages.receive(on: DispatchQueue.main).assign(to: \.isEnabled, on: sendButton)
btnSubscriber = $newMsg.receive(on: DispatchQueue.main).assign(to: \.text, on: messageLabel)
}
#IBAction func didSwitch (_ sender: UISwitch) {
canSendMessages = sender.isOn
}
#IBAction func sendMessage( _ sender: Any) {
}
}
I am getting error in
btnSubscriber = $newMsg.receive(on: DispatchQueue.main).assign(to: \.text, on: messageLabel)
error msg is
Type of expression is ambiguous without more context
I dont understand why label does not work as Switcher (bool)
I assume it is because \.isEnabled is not optional, and \.text is optional..??
how can I make this work with the same format. this is for practice and to understand how Combine works.. please help!
lableSubscriber = $newMsg.receive(on: DispatchQueue.main).assign(to: \.text!, on: messageLabel)
I solved it on my own! it was very simple.
just force unwrap the keyPath.
So I'm following this tutorial for Swift and am not getting the desired result at the end. This is my code for the ViewController:
import Cocoa
class ViewController: NSViewController {
#IBOutlet weak var nameField: NSTextField!
#IBOutlet weak var helloLabel: NSTextField!
override func viewDidLoad() {
super.viewDidLoad()
// Do any additional setup after loading the view.
}
override var representedObject: Any? {
didSet {
// Update the view, if already loaded.
}
}
#IBAction func sayButtonClicked(_ sender: Any) {
var name = nameField.stringValue
if name.isEmpty {
name = "World"
}
let greeting = "Hello \(name)!"
helloLabel.stringValue = greeting
}
}
And the following is the result:
When I debug the program however it does show the correct variables:
What am I doing wrong here?
Turns out I didn't stretch out the the Label field enough.
Im trying to pass an player score from VC1 to a view that displays the current scores of all players(4). the display view is on a separate view controller than where the player(s) score is defined and stored.
I have done the prepare(segue) and im able to pass other variables to the display VC(ThirdViewController). but when I try to assign the player score to the uilabel.text It tells me that I have unwrapped a nil value
I have even tried to just set the label text to a static string and still get the nil error.
class ViewController: UIViewController {
var name = String()
var player1Score = 1
var player2Score = 2
var player3Score = 3
var player4Score = 4
//MARK: ********* IBOutlets **********
#IBOutlet weak var playerSegmentOutlet: UISegmentedControl!
#IBOutlet weak var diceSegmentOutlet: UISegmentedControl!
#IBOutlet weak var targetScoreSliderOutlet: UISlider!
#IBOutlet weak var matchTargetSwitchOutlet: UISwitch!
#IBOutlet weak var targetScoreLabel: UILabel!
override func viewDidLoad() {
super.viewDidLoad()
}
override func prepare(for segue: UIStoryboardSegue, sender: Any?) {
if let VC = segue.destination as? SecondViewController {
VC.player1CurrentScore = player1Score
VC.player2CurrentScore = player2Score
VC.player3CurrentScore = player3Score
VC.player4CurrentScore = player4Score
}
}
Second view Controller
class SecondViewController: UIViewController {
#IBOutlet weak var CurrentRoundScoreLabel: UILabel!
#IBOutlet weak var CurrentPlayerScoreLabel: UILabel!
var player1CurrentScore = 1
var player2CurrentScore = 1
var player3CurrentScore = 1
var player4CurrentScore = 1
override func viewDidLoad() {
super.viewDidLoad()
}
override func prepare(for segue: UIStoryboardSegue, sender: Any?) {
if let VC = segue.destination as? ThirdViewController {
VC.player1ScoreLabel.text = String(player1CurrentScore)
VC.player2ScoreLabel.text = String(player2CurrentScore)
VC.player3ScoreLabel.text = String(player3CurrentScore)
VC.player4ScoreLabel.text = String(player4CurrentScore)
}
}
Third View Controller
class ThirdViewController: UIViewController {
#IBOutlet var player1ScoreLabel: UILabel!
#IBOutlet var player2ScoreLabel: UILabel!
#IBOutlet var player3ScoreLabel: UILabel!
#IBOutlet var player4ScoreLabel: UILabel!
override func viewDidLoad() {
super.viewDidLoad()
}
}
no matter what I try to do with with UILabel.text it shows up as nil
I'm totally frustrated and I'm sure I am missing something simple because of my frustration, please someone help me.
This is an inefficient way to do this as you are passing data through 3 different objects. However, going on with this methodology, the problem is the label's are not created yet inside
override func prepare(for segue: UIStoryboardSegue, sender: Any?) {
if let VC = segue.destination as? ThirdViewController {
VC.player1ScoreLabel.text = String(player1CurrentScore)
VC.player2ScoreLabel.text = String(player2CurrentScore)
VC.player3ScoreLabel.text = String(player3CurrentScore)
VC.player4ScoreLabel.text = String(player4CurrentScore)
}
}
See, the label isn't created yet. So, you are setting text on aUILabel that isn't initialized. Therefore, you need to create variables for the labels inside ThirdViewController.
Third View Controller
class ThirdViewController: UIViewController {
#IBOutlet var player1ScoreLabel: UILabel!
#IBOutlet var player2ScoreLabel: UILabel!
#IBOutlet var player3ScoreLabel: UILabel!
#IBOutlet var player4ScoreLabel: UILabel!
var score0:Int!
var score1:Int!
var score2:Int!
var score3:Int!
override func viewDidLoad() {
super.viewDidLoad()
self.player1ScoreLabel.text = String(score0)
self.player2ScoreLabel.text = String(score1)
self.player3ScoreLabel.text = String(score2)
self.player4ScoreLabel.text = String(score3)
}
}
and change the segue in SecondViewController
override func prepare(for segue: UIStoryboardSegue, sender: Any?) {
if let VC = segue.destination as? ThirdViewController {
VC.score0 = player1CurrentScore
VC.score1 = player2CurrentScore
VC.score2 = player3CurrentScore
VC.score3 = player4CurrentScore
}
}
Another Way:
Let's create a singleton called Game. Within this (assuming you only have 4 players) we can create 4 players that will never change. This allows us to create instances of players in one location and call upon them as necessary.
NOTE: A singleton can be misused EASILY.
https://cocoacasts.com/what-is-a-singleton-and-how-to-create-one-in-swift
https://cocoacasts.com/are-singletons-bad/
class Game {
static var score0:Int = 0
static var score1:Int = 0
static var score2:Int = 0
static var score2:Int = 0
}
Then, anywhere in your code you can access Game.score0, Game.score1.
CAUTION:
I would caution you to very carefully use singletons. You don't want everything with public access. You need to determine if this is good for you or not. Cheers.