Sorry if this is a dumb question. I just can't find why the UIbuttons are not working. They were working for awhile. Not sure what happened.
import UIKit
class ViewController: UIViewController
{
#IBOutlet weak var display: UILabel!
var userIsInTheMiddleOfTypingNumber = false
#IBAction func appendDigit(sender: UIButton) {
let digit = sender.currentTitle!
if userIsInTheMiddleOfTypingNumber {
display.text = display.text! + digit
}
else {
display.text = digit
userIsInTheMiddleOfTypingNumber = true
}
}
var operandStack = Array<Double>()
#IBAction func enter() {
userIsInTheMiddleOfTypingNumber = false
operandStack.append(displayValue)
println("operandStack = \(operandStack)")
}
var displayValue: Double {
get {
return NSNumberFormatter().numberFromString(display.text!)!.doubleValue
}
set {
display.text = "\(newValue)"
userIsInTheMiddleOfTypingNumber = false
}
}
}
chances are that after having made the IBAction connect you would change the name of the function, which untying its storyboard to your ViewController, if this were the case consult the storyboard and unlink the above, then should link to new.
Also I suggest you check this out:
#IBAction func enter(sender: AnyObject) {}
or
#IBAction func enter(sender: UIButton!) {}
Related
EDIT: New ErrorCurrently using XCode 12, and I'm trying to add a placeholder. I followed the Swift QuestionBot documentation but it doesn't work (I'm assuming it's because my XCode is much newer). Anyway, appreciate all the help!
EDIT: I added an image of a new error I got.
EDIT 2: Added MyQuestionAnswerer() struct! It's on a different view controller (obvious).
import UIKit
class ViewController: UIViewController {
#IBOutlet weak var responseLabel: UILabel!
#IBOutlet weak var askButton: UIButton!
#IBOutlet weak var questionField: UITextField!
let questionAnswerer = MyQuestionAnswerer()
override func viewDidLoad() {
super.viewDidLoad()
questionField.becomeFirstResponder()
}
func respondToQuestion(_ question: String) {
let answer = questionAnswerer.responseTo(question: question)
displayAnswerTextOnScreen(answer)
questionField.placeholder = "Ask another question..."
questionField.text = nil
askButton.isEnabled = false
}
#IBAction func askButtonTapped(_ sender: AnyObject) {
guard questionField.text != nil else {
return
}
questionField.resignFirstResponder()
}
func displayAnswerTextOnScreen(_ answer: String) {
responseLabel.text = answer
}
}
extension ViewController: UITextFieldDelegate {
func textFieldShouldReturn(_ textField: UITextField) -> Bool {
textField.resignFirstResponder()
return false
}
func textFieldDidEndEditing(_ textField: UITextField) {
guard let text = textField.text else {
return
}
respondToQuestion(text)
}
#IBAction func editingChanged(_ textField: UITextField) {
guard let text = textField.text else {
askButton.isEnabled = false
return
}
askButton.isEnabled = !text.isEmpty
}
}
struct MyQuestionAnswerer {
func responseTo(question: String) -> String {
let loweredQuestion = question.lowercased()
if loweredQuestion == "What is the current vaccination rate of the Philippines?" {
return "As of August 8, the vaccination rate of the Philippines is 10%!"
} else if loweredQuestion.hasPrefix("Where") {
return "Check the map for nearby vaccination centers."
}
}
The placeholder is not present when the textFiled as it is not set until the respondToQuestion method is called. It should probably be set inside of a view controller life cycle method such as viewDidLoad().
Example:
override func viewDidLoad() {
super.viewDidLoad()
questionField.placeholder = "Ask another question"
questionField.becomeFirstResponder()
}
I am trying to get the values for splitValue and tipPercent into the getSettings() at the bottom. Why can I get the values for both of those in the IBAction calculatePressed, but when I try to get the values into the function the value is nil. I am sooo confused. Thank you for the help!
#IBOutlet weak var billTextField: UITextField!
#IBOutlet weak var zeroPctButton: UIButton!
#IBOutlet weak var tenPctButton: UIButton!
#IBOutlet weak var twentyPctButton: UIButton!
#IBOutlet weak var splitNumberLabel: UILabel!
var tipChosen = ""
var totalPerPerson = ""
var tipPercent = ""
var splitValue = ""
#IBAction func tipChanged(_ sender: UIButton) {
tipPercent = sender.currentTitle!
if sender.isSelected == true {
return
}
zeroPctButton.isSelected = false
tenPctButton.isSelected = false
twentyPctButton.isSelected = false
sender.isSelected = true
if sender.currentTitle == "0%" {
tipChosen = "0.00"
} else if sender.currentTitle == "10%" {
tipChosen = "0.10"
} else if sender.currentTitle == "20%" {
tipChosen = "0.20"
}
billTextField.endEditing(true)
}
#IBAction func stepperValueChanged(_ sender: UIStepper) {
splitValue = String(Int(sender.value))
splitNumberLabel.text = String(Int(sender.value))
}
#IBAction func calculatePressed(_ sender: UIButton) {
let bill = Float(billTextField.text!)!
let tip = Float(tipChosen)!
let tax = bill * tip
let splitNumber = Float(splitNumberLabel.text!)
let total = (bill + tax) / Float(splitNumber!)
totalPerPerson = "$\(String(format: "%.2f", total))"
performSegue(withIdentifier: "goToTotal", sender: self)
}
func getSettings() -> String {
return "Split between \(splitValue) people, with a \(tipPercent) tip."
}
Ok, sorry it took me a bit, but I finally think I understand what I did.
class CalculatorViewController: UIViewController {
var tip = 0.0
var finalBill = ""
var split = 2
#IBOutlet weak var billTextField: UITextField!
#IBOutlet weak var zeroPctButton: UIButton!
#IBOutlet weak var tenPctButton: UIButton!
#IBOutlet weak var twentyPctButton: UIButton!
#IBOutlet weak var splitNumberLabel: UILabel!
#IBAction func tipChanged(_ sender: UIButton) {
if sender.isSelected == false {
sender.isSelected = false
} else if sender.isSelected == true {
sender.isSelected = true
}
zeroPctButton.isSelected = false
tenPctButton.isSelected = false
twentyPctButton.isSelected = false
sender.isSelected = true
billTextField.endEditing(true)
}
#IBAction func stepperValueChanged(_ sender: UIStepper) {
splitNumberLabel.text = Int(sender.value).description
}
#IBAction func calculatePressed(_ sender: UIButton) {
if zeroPctButton.isSelected == true {
tip = 0.0
} else if tenPctButton.isSelected == true {
tip = 0.1
} else if twentyPctButton.isSelected == true {
tip = 0.2
}
print(tip)
let bill = Double(billTextField.text!)
split = Int(Double(splitNumberLabel.text!)!)
if billTextField.text != "" {
let billWithTip = (bill! * tip) + bill!
let billWithTipSplit = billWithTip / Double(split)
finalBill = String(format: "%.2f", billWithTipSplit)
print(billWithTip)
}
self.performSegue(withIdentifier: "getResults", sender: self)
}
override func prepare(for segue: UIStoryboardSegue, sender: Any?) {
if segue.identifier == "getResults" {
let destinationVC = segue.destination as! ResultsViewController
destinationVC.finalBill = finalBill
destinationVC.split = split
destinationVC.tip = tip
}
}
}
class ResultsViewController: UIViewController {
#IBOutlet weak var totalLabel: UILabel!
#IBOutlet weak var settingsLabel: UILabel!
var tip = 0.0
var split = 2
var finalBill = ""
override func viewDidLoad() {
super.viewDidLoad()
totalLabel.text = "$\(finalBill)"
settingsLabel.text = "Split between \(Int(split)) people, with a \(Int(tip * 100))% tip"
}
#IBAction func recalculatePressed(_ sender: UIButton) {
dismiss(animated: true, completion: nil)
}
}
I did what you suggested with the string and some minor calculations on the second view controller, changed the values of a few declared properties and got rid of the getSettings(). I was under the impression that I couldn't pass data without a return value from a function. Thank you for the help!
I'm new to xcode, need to find the character count of the String in the UILabel
#IBAction func buttonPressed(_ sender: Any) {
curr_channel.text = ""
let tag = (sender as! UIButton).tag
if((curr_channel.text?.character.count())! < 2){
curr_channel.text = curr_channel.text! + String(tag)
}
}
I guess this is what you need :
#IBAction func buttonPressed(_ sender: Any) {
let tag = (sender as! UIButton).tag
if let text = curr_channel.text, text.count < 2 {
curr_channel.text = "\(text) \(tag)"
}
}
Here's how you can print/ get the character count in a UILable.
#IBOutlet weak var myLabel: UILabel!
#IBAction func buttonPressed(_ sender: Any) {
let countOfCharsInLabel = myLabel.text?.count
print("\(countOfCharsInLabel)")
}
I have a task to create an app that checks if a String is a palindrome or not. And also I have instructed to create a file and in that file should be a function. But what I can't figure out is how to make a button run that function that is in the file.
func isPalidrone(phrase: String) -> Bool {
let isPalidrone = true
let reversed = String(phrase.reversed())
if reversed == phrase {
return isPalidrone
} else {
return !isPalidrone
}
}
class ViewController: UIViewController {
#IBOutlet weak var Label: UILabel!
#IBOutlet weak var textFieldOutlet: UITextField!
override func viewDidLoad() {
super.viewDidLoad()
}
#IBAction func buttonPressed(_ sender: Any) {
}
}
Like this:
#IBAction func buttonPressed(_ sender: Any) {
let pal = isPalidrone(phrase: self.textFieldOutlet.text!)
// now pal is true or false and you can decide what else to do ...
// for example:
self.Label.text = pal ? "It is a palindrome" : "It is not a palindrome"
}
I'm trying to make a custom keyboard. But I cannot input info on the active textField. I'm not sure what I'm doing wrong.
PS: The keyboard is in another ViewController and is passing the sender.tag well.
Here is my code:
import UIKit
class HomeVC: UIViewController, ButtonTapDelegate, UITextFieldDelegate {
#IBOutlet var textField1: UITextField!
#IBOutlet var textField2: UITextField!
#IBOutlet var keyboardView: UIView!
var activeField: UITextField?
var delegate: ButtonTapDelegate!
override func viewDidLoad() {
addKeyboard(view: keyboardView)
textField1.inputView = UIView()
textField2.inputView = UIView()
textField1.becomeFirstResponder()
activeField?.delegate = self
}
func textFieldDidBeginEditing(_ textField: UITextField) {
activeField = textField
}
func addKeyboard(view: UIView) {
let keyboard = KeyboardVC(nibName: "KeyboardVC", bundle: nil)
keyboard.delegate = self
view.addSubview(keyboard.view)
addChild(keyboard)
}
func didTapButton(sender: UIButton) {
if sender.tag == 8 {
activeField?.text?.append(contentsOf: " ")
} else if sender.tag == 9 {
activeField?.text?.removeAll()
} else {
let val = sender.titleLabel?.text
activeField?.text?.append(contentsOf: val!)
}
}
}
There is a slight problem in your code that is causing your issue. In the comments, you mentioned that didTapButton() is called beforetextFieldDidBeginEditing. This means that actionField is not assigned a value and therefore is nil. Your code in didTapButton() safely unwraps the optional value so that no error is produced, but of course, you cannot append text to a non-existent UITextField.
I was able to fix it after some research with changes to the textFieldDidBeginEditing and didTapButton functions: Here is the full code if anybody wants to choose one textField at a time with a custom keyboard:
import UIKit
class HomeVC: UIViewController, ButtonTapDelegate, UITextFieldDelegate {
#IBOutlet var textField1: UITextField!
#IBOutlet var textField2: UITextField!
#IBOutlet var keyboardView: UIView!
var activeField: UITextField?
var delegate: ButtonTapDelegate!
override func viewDidLoad() {
addKeyboard(view: keyboardView)
textField1.inputView = UIView()
textField2.inputView = UIView()
textField1.becomeFirstResponder()
activeField?.delegate = self
}
func textFieldDidBeginEditing(_ textField: UITextField) {
self.activeField = textField
}
func addKeyboard(view: UIView) {
let keyboard = KeyboardVC(nibName: "KeyboardVC", bundle: nil)
keyboard.delegate = self
view.addSubview(keyboard.view)
addChild(keyboard)
}
func didTapButton(sender: UIButton) {
if textField1 == self.activeField {
if sender.tag == 8 {
textField1.text?.append(contentsOf: " ")
} else if sender.tag == 9 {
textField1.text?.removeAll()
} else {
let val = sender.titleLabel?.text?
textField1.text?.append(contentsOf: val!)
}
return;
}
if textField2 == self.activeField {
if sender.tag == 8 {
textField2.text?.append(contentsOf: " ")
} else if sender.tag == 9 {
textField2.text?.removeAll()
} else {
let val = sender.titleLabel?.text?
textField2.text?.append(contentsOf: val!)
}
return;
}
}
}