I am making an app where there is a football field and when you click on the Score Zone 7 points are added to the UILabel that marks score. But I have only been able to display a 7 once and if I click again the seven appears again; I want it to add 7 more to make a 14.
#IBAction func touchdownMD(sender: AnyObject) {
var pointsMD = Int()
scoreMD.text = "\(pointsMD + 7)"
}
#IBOutlet var scoreSH: UILabel!
When you initialize pointsMD inside of the touchdownMD: function, it starts from 0 whenever the function is called.
In order to fix this, you need to declare it at the class level. For example:
var pointsMD = Int() //initialize pointsMD at the class level
#IBAction func touchdownMD(sender: AnyObject){
pointsMD+=7 //add 7 to pointsMD
scoreMD.text = "\(pointsMD)"
}
That way, pointsMD will not reset whenever touchdownMD: is called, it will instead just increment as needed.
So, here's what your code could look like:
var pointsMD = Int()
#IBAction func touchdownMD(sender: AnyObject) {
pointsMD+=7
scoreMD.text = "\(pointsMD)"
}
#IBOutlet var scoreSH: UILabel!
Related
I couldn't figure out how to copy value of variable into another variable in Swift, an example code for this in python would be
def assignVariable():
x=1
y=x
return y
RESULT 1
When I did this it doesn't seem to work in Swift. Is there any solution to this or am I doing something wrong?
Edit: problem is at
var originalCount=countDown
it gave me Use of unresolved identifier 'countDown' but when I assign it literally it works. Here's my swift code
import Cocoa
class MainWindow: NSWindowController {
var hitCount = 0
var started:Bool = false
var timer = 10
var colorList: [NSColor] = [ NSColor.black,NSColor.blue,NSColor.brown,NSColor.cyan,NSColor.darkGray,NSColor.gray,NSColor.green,NSColor.lightGray,NSColor.magenta,NSColor.orange,NSColor.purple,NSColor.red,NSColor.white,NSColor.yellow]
#IBOutlet weak var button1: NSButton!
#IBOutlet weak var scrubber1: NSScrubber!
#IBOutlet weak var display: NSTextField!
override func windowDidLoad() {
super.windowDidLoad()
// Implement this method to handle any initialization after your window controller's window has been loaded from its nib file.
}
var countdown=10
var originalCount=countDown
//(countdown,originalCount) = (10,10) //it works if i use this instead
func startGame(){
if(countDown>0 || started==true){
display.stringValue=String(countDown)
countDown-=1
let seconds = 1.0
DispatchQueue.main.asyncAfter(deadline: .now() + seconds) {
self.startGame()
}
}else{
display.stringValue="Done "+String(hitCount)+" Taps in " + String(originalCount) + "Tap to RESET"
started=false
countDown=10;
}
}
#IBAction func labelPress(_ sender: Any) {
display.stringValue="__RESET__"
hitCount=0
countDown=10
started=false
}
#IBAction func buttonPressed(_ sender: Any) {
if started==false{
startGame()
}
button1.bezelColor = colorList[Int.random(in: 0..<colorList.count)]
started=true
button1.title=String(hitCount)
hitCount+=1
}
}
You can't initialise one variable with another at the top level in your class. Looking at your code I don't think that originalCount needs to be a property, move it inside startGame() instead and make it a local variable and also use let since it isn't changing
var countdown=10
func startGame(){
let originalCount = countDown
if(countDown>0 || started==true){
...
}
I am working on trying to build a tip calculator using swift but am running into a multitude of problems. I have a text box where the user enters in the bill amount and then they can adjust a slider to indicate the percentage that they want to tip. I have managed to get the slider and label associated with it to work where changing the value on the slider changes the label. However, I can't figure out how to get the text field to work. I attempted to create an action for the bill amount text box being changed but no matter what I put in it, it doesn't seem like the code is ever being executed (Whenever I run the code and click in the text box, the keyboard won't go away so maybe this is part of the problem?). All that I need is to be able to access the value in the text box field inside of my action when I click the calculate button but I can't seem to even get the value to show up much less convert it to a double so I can perform calculations on it. I am super new to swift and really want to learn what I am doing wrong. I have tried multiple tutorials and similar questions on here but none of them work. I appreciate all help y'all can give.
import UIKit
class ViewController: UIViewController {
#IBOutlet weak var txtBillAmount: UITextField!
#IBOutlet weak var lblTipPercentage: UILabel!
#IBOutlet weak var sldTipPercentage: UISlider!
#IBOutlet weak var lblTipAmount: UILabel!
#IBOutlet weak var lblTotalAmount: UILabel!
var tipPercentage = 10
var billAmount = ""
#IBAction func valueChanged(sender: AnyObject) {
let currentValue = Int(sldTipPercentage.value)
lblTipPercentage.text = "\(currentValue)%"
tipPercentage = currentValue
}
#IBAction func btnCalculate(sender: AnyObject) {
lblTipAmount.text = "\(billAmount)"
}
#IBAction func txtBillAmountValueChanged(sender: AnyObject) {
}
override func viewDidLoad() {
super.viewDidLoad()
//txtBillAmount.delegate = self
// Do any additional setup after loading the view, typically from a nib.
}
#IBAction func btnReset(sender: UIButton) {
sldTipPercentage.value = 10
lblTipPercentage.text = "10%"
txtBillAmount.text = ""
lblTipAmount.text = "--"
lblTotalAmount.text = "--"
}
override func didReceiveMemoryWarning() {
super.didReceiveMemoryWarning()
// Dispose of any resources that can be recreated.
}
}
This is a screenshot of how the UI looks
Error that I am getting
[Xcode >= 7 and Swift > 2]
Try like this
#IBAction func btnCalculate(sender: AnyObject) {
if let textValue = txtBillAmount.text {
let billAmnt = Double(textValue)
let tipAmount = (billAmnt*tipPercentage)/100
lblTipAmount.text = "\(tipAmount)"
}
}
If you are using Xcode-6 and Swift < 2 then try the following way. because String initializer for Double is only available in Swift 2 (Xcode 7). [Recommend update your Xcode]
#IBAction func btnCalculate(sender: AnyObject) {
let billAmnt = (txtBillAmount.text! as NSString).doubleValue
let tipAmount = (billAmnt*tipPercentage)/100
lblTipAmount.text = "\(tipAmount)"
}
i-m trying to learn how to code and working on my first ever app. it is some gym app. and i want to have a timer and a label to be changed after presing a button.
This is my code until now but i cant figure it out how to display the next label and the next timer to countdown after presing the button.
class _daysday1ViewController: UIViewController {
#IBOutlet weak var exerciseNameLabel: UILabel!
#IBOutlet weak var btnStart: UIButton!
#IBOutlet weak var exercisePicture: UIImageView!
#IBOutlet weak var exerciseDescriptionLabel: UILabel!
#IBOutlet weak var timerLabel: UILabel!
#IBAction func nextButtonTapped(sender: AnyObject) {
var timer = NSTimer.scheduledTimerWithTimeInterval(1, target: self, selector: Selector("update"), userInfo: nil, repeats: true)
count = countList[0]
}
var exerciseIndex = 0
var exerciseList = ["12 reps at 80% of capicity" , " 10 reps at 90%" , "7 to 10 reps at full capacity"]
var countList = [4 , 6 ,8]
var count = 1
override func viewDidLoad() {
super.viewDidLoad()
}
func update() {
if(count >= 0) {
timerLabel.text = String(count--)
self.btnStart.enabled = false
return
}
btnStart.enabled = true
exerciseDescriptionLabel.text = exerciseList[0]
}
`
Your timer will go away almost as soon as it's created, because you declared the timer var within the nextButtonTapped function. That function finishes quickly, and your timer goes away when it finishes.
To fix this, declare the timer var at the class level, the same place you declared the count var, like this:
var timer: NSTimer?
Declaring it as an optional (?) allows it be nil until the next button is tapped.
To create it, simply change the line of code in nextButtonTapped to begin with this:
self.timer = ...
Instead of this:
var timer = ...
In your func nextButtonTapped() method, you can include the code for this. The #IBAction will make this method fire every time the button is touched, so if you need variables to change with this action simple outline what you want to change between the {};
example:
var currentExercise = 0
#IBAction func nextButtonTapped() {
btnStart.textLabel.text = "New Text To Display"
currentExercise += 1
exerciseDescriptionLabel.text = exerciseList[currentExercise]
}
I want to change the number value of a label by pressing a button. I used to get errors saying you can't put a number in a string, so, I did string(variable). It now displays the basic number, 1, but when I click it, it doesn't update!
Here is how I set up the variable:
First, I set up the button, to IBAction. Here is the code inside of it:
#IBOutlet weak var NumberOfExploits: UILabel!
#IBAction func exploiter(sender: AnyObject) {
var hacks = 0
hacks += 1
NumberOfExploits.text = String(hacks)
}
Can someone help be find out how to get it to change numbers?
First:
let is used for constants, these can not be changed.
var is used for variables.
Second:
Doing plus one is done with += 1 or with = myVariable + 1
var myVariable = 1
myVariable += 1
label.text = string(myVariable)
It is important to understand that your variables only live as long as the enclosing class or function is alive. So when you declare a variable, constant inside a function (using var let is a declaration) it will be be gone when the function is complete. A UIViewcontroller is there for as long as you want it to be. So declare things in there that you will need later.
import UIKit
// things that live here are at the "global level"
// this is a viewcontroller. It is a page in your app.
class ViewController: UIViewController {
// things that live here are at the "class level"
var myClassCounter : Int = 0
// button in interfacebuilder that is connected through an outlet.
#IBOutlet weak var myButton: UIButton!
override func viewDidLoad() {
super.viewDidLoad()
// this is a function that gets called when the view is loaded
}
override func viewDidAppear(animated: Bool) {
// this is a function that gets called when the view appeared
}
// button function from interface builder
#IBAction func myButtonIsTouched(sender: AnyObject) {
// this will be destroyed when the function is done
var myFunctionCounter = 0
myFunctionCounter += 1
// this will be stored at class level
myClassCounter += 1
}
override func didReceiveMemoryWarning() {
super.didReceiveMemoryWarning()
// Dispose of any resources that can be recreated.
}
}
You can also just do
label.text = "\\(variable)"
which will display the number as string.
Most important declare the variable within the class but outside any function
var variable = 1
then write the IBAction function this way
#IBAction func pressButton(sender : UIButton)
{
label.text = "\(++variable)"
}
The syntax ++variable increments the variable by one.
The syntax "\(v)" creates a string of anything which is string representable
like it says in the title, i am trying to change label text upon click of a button. Error appears at line self.playerChoice.text = "You: Rock"
import UIKit
class ViewController: UIViewController {
var player : Int = Int()
#IBOutlet weak var readyLabel: UILabel!
#IBAction func noButton(sender: AnyObject) {
exit(0)
}
// ---------------------------------------------------------
#IBOutlet var computerChoice: UILabel!
#IBOutlet var playerChoice: UILabel!
#IBOutlet var score: UILabel!
// Variables -------------------------------------------------
let Rock : String = "Rock"
let Paper : String = "Paper"
let Scissors : String = "Scissors"
//------------------------------------------------------------
override func viewDidLoad() {
super.viewDidLoad()
// Do any additional setup after loading the view, typically from a nib.
}
// ----------------------------------------------------------------
#IBAction func rockButton(rockbut: UIButton) {
player = 0
var ai = arc4random_uniform(3)
self.playerChoice.text = "You: Rock"
}
#IBAction func paperButton(paperbut: UIButton) {
player = 1
var ai = arc4random_uniform(3)
self.playerChoice.text = "You: Paper"
}
#IBAction func scissorsButton(scissorsbut: UIButton) {
player = 2
var ai = arc4random_uniform(3)
self.playerChoice.text = "You: Scissors"
}
}
I ran into this problem and it turned out that the labels that I was trying to edit didn't exist at the time the code ran.
Turns out I was referencing the same view controller from a parent view and a child container view. The labels I was trying to change were only in the container view but as both views loaded it ran the view controller for both so it tried to find the labels that didn't exist in the parent view and threw the above error.
So the lesson I learned... If a reference to a view object is throwing a NIL..
The View isn't properly mapped to the View Controller.
The object within the view isn't mapped to the referencing IBOutlet.
Or as in my case, there are multiple views connected to the same View Controller and references to view objects in one view are not being found in the other.
Looks like player choice is not initialized.
#IBOutlet var playerChoice: UILabel!
Maybe the connection between the outlet and InterfaceBuilder/Storyboard is lost. Try to connect it again.
I've created a small demo and everything works fine:
Check if the circles at the left side of your IBOutlet are filled. Otherwise the connection is lost.
What fixed this for me (and it gets me everytime, especially when you are new to using storyboards) is to make sure that you are initializing your view controller like so :
slideShowVC = (UIStoryboard(name: "Main",bundle: nil).instantiateViewControllerWithIdentifier("WWPhotoSlideShowVC") as! WWPhotoSlideShowVC)
instead of the stand alone xib way :
slideShowVC = WWSlideShowVC()
Or else all your outlets will be nil na many headaches will soon follow.
I ran into the same issue in Xcode 6.2.
I use individual XIBs instead of storyboards. The problem for me was that with Swift, Xcode does not automatically associate the XIB with the view controller if the names are the same. Hence the IBOutlets for the labels are pointing to nil giving the fatal.
You can change the viewcontroller.xib to be called modulename.viewcontroller.xib so that xcode can associate it with the view controller and the issue goes away.
More options are mentioned on this thread:
Can't Load UIViewController XIB file in Storyboard in Swift
I have tried this code and it working fine for me:
class ViewController: UIViewController {
var player : Int = Int() //Declare this globally
#IBOutlet weak var readyLabel: UILabel!
#IBAction func noButton(sender: AnyObject) {
exit(0)
}
// ---------------------------------------------------------
#IBOutlet var computerChoice: UILabel!
#IBOutlet var playerChoice: UILabel!
#IBOutlet var score: UILabel!
// Variables -------------------------------------------------
let Rock : String = "Rock"
let Paper : String = "Paper"
let Scissors : String = "Scissors"
//------------------------------------------------------------
#IBAction func rockButton(rockbut: UIButton) {
player = 0
var ai = arc4random_uniform(3)
self.playerChoice.text = "You: Rock"
}
#IBAction func paperButton(sender: UIButton) {
player = 1
var ai = arc4random_uniform(3)
self.playerChoice.text = "You: Paper"
}
#IBAction func scissorsButton(sender: UIButton) {
player = 2
var ai = arc4random_uniform(3)
self.playerChoice.text = "You: Scissors"
}
override func viewDidLoad() {
super.viewDidLoad()
// Do any additional setup after loading the view, typically from a nib.
var p : String = "Undecided"
if (player == 0) {
var p: String = "Rock"
} else if (player == 1) {
var p: String = "Paper"
} else if (player == 2) {
var p: String = "Scissors"
}
}
}