import UIKit
class ViewController: UIViewController {
let softTime = 5
let mediumTime = 7
let hardTime = 12
#IBAction func hardnessSelected(_ sender: UIButton) {
// print(sender.currentTitle)
let hardness = sender.currentTitle
/* I want print the of let if pressed first button or second ... */
The .currentTitle property is an optional and must be unwrapped. Try this:
#IBAction func hardnessSelected(_ sender: UIButton) {
if let buttonTitle = sender.title(for: .normal) {
print(buttonTitle)
}
}
// thank you guys I fount the answer
switch hardness {
case "Soft":
print(5)
case "Medium":
print(7)
case "Hard":
print(12)
default:
print("Error")
}
}
import UIKit
let softTime = 5
let mediumTime = 7
let hardTime = 12
class ViewController: UIViewController {
#IBAction func hardnessSelected(_ sender: UIButton) {
let hardness = sender.currentTitle
//control flow
if (hardness == "Soft") {
print(softTime)
}else if (hardness == "Medium") {
print(mediumTime)
}else if (hardness == "Hard") {
print(hardTime)
}
}
}
Common decision
Related
I have successfully implemented core data and UISteppers. Every time I try to edit a saved record the UI Stepper starts over from 0. Please help me to figure put what additional code I need to retain the already edited value.
// This function adds the stepper to a field
//issue: it does not remember the score when i edit it and starts over
#IBAction func counterStepperPressed(_ sender: UIStepper) {
counterTF.text = Int(sender.value).description
}
#IBAction func pointStepperPressed(_ sender: UIStepper) {
pointTF.text = Int(sender.value).description
}
#IBAction func savingsStepperPressed(_ sender: UIStepper) {
savingsTF.text = Int(sender.value).description
}
}
I have linked core data like so:
import CoreData
class AktieViewController: UIViewController {
#IBOutlet weak var counterStepper: UIStepper!
#IBOutlet weak var pointsStepper: UIStepper!
#IBOutlet weak var savingsStepper: UIStepper!
var selectedAktie: Aktie? = nil
override func viewDidLoad()
{
super.viewDidLoad()
if(selectedAktie != nil) {
savingsTF.text = selectedAktie?.saving
counterTF.text = selectedAktie?.counter
pointTF.text = selectedAktie?.point
}
}
#IBAction func saveAction(_ sender: Any) {
let appDelegate = UIApplication.shared.delegate as! AppDelegate
let context: NSManagedObjectContext = appDelegate.persistentContainer.viewContext
if(selectedAktie == nil)
{
let entity = NSEntityDescription.entity(forEntityName: "Aktie", in: context)
let newAktie = Aktie (entity: entity!, insertInto: context)
newAktie.saving = savingsTF.text
newAktie.point = pointTF.text
newAktie.counter = counterTF.text
do {
try context.save()
aktieList.append(newAktie)
navigationController?.popViewController(animated: true)
}
catch
{
print("context save error")
}
}
I also have an edit and delete function.
This function eventually solved my question:
#IBAction func counterStepperPressed(_ sender: UIStepper) {
let initialValue=Int(counterTF.text) ?? 0
let newValue=Int(sender.value)+initialValue
counterTF.text="\(newValue)"
}
I have managed to add the following code to remember the value in the stepper.
if let value=UserDefaults.standard.value(forKey: "counterStepper") as? Double {
counterStepper.value=value counterTF.text=String(describing: value)
And in the action I have added the following code.
#IBAction func counterStepperPressed(_ sender: UIStepper) {
counterTF.text=String(describing: sender.value)
UserDefaults.standard.setValue(sender.value, forKey: "counterStepper")
NotificationCenter.default.post(Notification.init(name: Notification.Name("StepperDidChangeValue")))
}
The only issue I have is that if I edit a second item it remembers the value of the first item. Somehow it is not remembering the original value of the item.
I am currently trying to implement the new iOS 14 UIColorPicker. Everything works great, except the eye dropper functionality of the UIColorPicker. After selecting the the eye dropper and sampling a color, the default behavior should be to re-open the UIColorPicker with your selected color as the active one. For some reason, this does not happen. Here is my implementation, its pretty standard, so I'm not sure why the eyedropper isnt behaving as expected.
I have these functions that are passed as the selectors for when I have some UI elements pressed
#objc func pickColorSky(sender: UIControl){
presentColorPicker(tag: 1, sender: sender)
}
#objc func pickColorBackground(sender: UIControl){
presentColorPicker(tag: 2, sender: sender)
}
#objc func pickColorGround(sender: UIControl){
presentColorPicker(tag: 3, sender: sender)
}
Here is the function that presents the UIColorPickerView itself
#objc private func presentColorPicker(tag: Int, sender: UIControl){
let vc = UIColorPickerViewController()
vc.supportsAlpha = false
vc.delegate = self
vc.view.tag = tag
vc.modalPresentationStyle = .popover
vc.popoverPresentationController?.sourceView = sender
vc.popoverPresentationController?.sourceRect = sender.bounds
self.present(vc, animated: true)
}
And the delegate methods to handle the interacting with the color picker
extension myViewController: UIColorPickerViewControllerDelegate {
func colorPickerViewControllerDidFinish(_ viewController: UIColorPickerViewController) {
guard let options = editor?.apiView?.getRenderingOptions() else { return }
if viewController.view.tag == 1 {
let newColor = getMobileApiColor(color: viewController.selectedColor)
options.skyColor = newColor
skyRow.color.backgroundColor = newColor.uiColor
}
else if viewController.view.tag == 2 {
let newColor = getMobileApiColor(color: viewController.selectedColor)
options.backgroundColor = newColor
backgroundRow.color.backgroundColor = newColor.uiColor
}
else if viewController.view.tag == 3 {
let newColor = getMobileApiColor(color: viewController.selectedColor)
options.groundColor = newColor
groundRow.color.backgroundColor = newColor.uiColor
}
editor?.modelView?.setNeedsDisplay()
}
Try this method colorPickerViewControllerDidSelectColor
extension ViewController: UIColorPickerViewControllerDelegate {
// Called once you have finished picking the color.
func colorPickerViewControllerDidFinish(_ viewController: UIColorPickerViewController) {
self.view.backgroundColor = viewController.selectedColor
}
// Called on every color selection done in the picker.
func colorPickerViewControllerDidSelectColor(_ viewController: UIColorPickerViewController) {
self.view.backgroundColor = viewController.selectedColor
}
}
You need to hold on to the picker object as a class member like this:
private lazy var colorPicker = makeColorPicker()
private func makeColorPicker() -> UIColorPickerViewController {
let vc = UIColorPickerViewController()
vc.delegate = self
vc.supportsAlpha = false
return vc
}
Otherwise, it is removed from memory before you complete the eye-dropper step.
I have seen some other questions asked but I am having trouble getting it to work. I have a Mac app coded in swift and it has a Firebase login but the user types a key in that is stored on Firebase, is there a way to automatically delete that key when the user has successfully used it?
This is my database.
This is the code that is used currently.
import Cocoa
import FirebaseAuth
import FirebaseDatabase
class LoginViewController: NSViewController {
#IBOutlet weak var textUsername: NSTextField!
#IBOutlet weak var textPassword: NSSecureTextFieldCell!
#IBOutlet weak var btnLogin: NSButton!
var keyArray = \[Int64\]()
override func viewDidLoad() {
super.viewDidLoad()
}
override func viewWillAppear() {
}
func getLoginState() -> Bool{
let state = UserDefaults.standard.bool(forKey: "isRegistered")
if (state) {
return true
} else {
return false
}
}
override func viewDidAppear() {
let state = self.getLoginState()
if (state){
self.performSegue(withIdentifier: NSStoryboardSegue.Identifier(rawValue: "loginsegue"), sender: nil)
self.view.window?.close()
}
var ref: DatabaseReference!
ref = Database.database().reference()
let keyRef = ref.child("key1")
keyRef.observe(DataEventType.childAdded, with: { (snapshot) in
// let postDict = snapshot.value as? \[String : AnyObject\] ?? \[:\]
let keyStr = snapshot.value as? Int64
if let actualPost = keyStr{
self.keyArray.append(actualPost)
}
})
}
#IBAction override func dismissViewController(_ viewController: NSViewController) {
dismiss(self)
}
#IBAction func close(sender: AnyObject) {
self.view.window?.close()
}
#IBAction func onSignup(_ sender: Any) {
// self.performSegue(withIdentifier: NSStoryboardSegue.Identifier(rawValue: "gotosignup"), sender: sender)
// self.view.window?.close()
}
func dialogOK(question: String, text: String) -> Void {
let alert: NSAlert = NSAlert()
alert.messageText = question
alert.informativeText = text
alert.alertStyle = NSAlert.Style.warning
alert.addButton(withTitle: "OK")
alert.runModal()
}
#IBAction func onLogin(_ sender: Any) {
//self.btnLogin.isEnabled = false
var isKey = false
if (!self.textUsername.stringValue.isEmpty) {
for key in keyArray{
if(Int64(self.textUsername.stringValue)! == key)
{
UserDefaults.standard.set(true, forKey:"isRegistered")
self.performSegue(withIdentifier: NSStoryboardSegue.Identifier(rawValue: "loginsegue"), sender: nil)
self.view.window?.close()
isKey = true
}
}
if (!isKey){
self.dialogOK(question: "Error", text: "Invalid Key")
}
} else {
self.dialogOK(question: "Error", text: "Please Input Key")
}
}
}
You can't sort your database like that and expect a working code, even if there's any. It will make a messy code:
You need to:
Sort your database like [1220:0]. the key first. 0 & 1 as an indicator if it's used or not.
Once the user taps onLogin() you need to set the used key value to 1
Setup Cloud Functions to check if the used key is equal to 1, if yes. then remove the key.
Do the rest of the work.
Related Articles to get you started:
Extend Realtime Database with Cloud Functions
functions.database.RefBuilder
I have a tableView that has a UISwitch in it I am using notificationCenter to get the row of the UISwitch. How do I now use that info to turn off every other switch except the switch that I clicked?
func creatNotification() {
let switchNotification = Notification.Name("answer")
NotificationCenter.default.addObserver(self,selector: #selector(getSwitchRow),name:switchNotification, object:nil)
}
#objc func getSwitchRow(notification: NSNotification){
rowNumber = notification.object as! Int
print("dataView2, getSwitchRow, rowNumber:", rowNumber)
}
#IBAction func `switch`(_ sender: UISwitch) {
var dataViewObject = DataView2()
dataViewObject.creatNotification()
let switchNotification = Notification.Name("answer")
NotificationCenter.default.post(name: switchNotification, object: rowNumber)
let switchNotification2 = Notification.Name("switch")
NotificationCenter.default.post(name: switchNotification, object: answerSwitch.isOn)
if(answerSwitch.isOn == true){
}
}
you can define an attribute : var previousSwitch: UISwitch?
Then the Selector :
#objc func setOn(sender: UISwitch,indexPath: IndexPath){
if previousSwitch != nil {
previousSwitch?.isOn = false
}
let sw = sender
let isSetOn = sw.isOn
if (isSetOn){
print("on")
}else{
print("off")
}
previousSwitch = sw
}
and in Cell :
sw.addTarget(self, action: #selector(setOn(sender:indexPath:)), for: .valueChanged)
cell?.contentView.addSubview(sw)
Im having an issue here when trying to follow the first stanford lecture. I am assuming it is because I am using swift 2.... which was just recently released. (And the class is not) Below I show where I am getting errors. In the class the "enter" button on the calculator has the code #IBAction func enter() { but in mine it is #IBAction func enter(sender: UIButton) {
Is this something I did wrong when bringing the button into my code? Any ways to fix? Let me know if I can clarify anything.
import UIKit
class ViewController: UIViewController
{
#IBOutlet var display: UILabel!
var userIsInTheMiddleOfTypingANumber: Bool = false
#IBAction func appendDigit(sender: UIButton) {
let digit = sender.currentTitle!
if userIsInTheMiddleOfTypingANumber {
display.text = display.text! + digit
} else {
display.text = digit
userIsInTheMiddleOfTypingANumber = true
}
}
#IBAction func operate(sender: UIButton) {
let operation = sender.currentTitle!
if userIsInTheMiddleOfTypingANumber {
enter() // Here is my error: *Missing Argument for parameter on the line of code that says enter()
}
switch operation {
case "x":
if operandStack.count >= 2 {
displayValue = operandStack.removeLast() * operandStack.removeLast()
enter() // Here is my error: Again...
}
default: break
}
}
var operandStack = Array<Double>()
#IBAction func enter(sender: UIButton) {
userIsInTheMiddleOfTypingANumber = false
operandStack.append(displayValue)
print("operandStack = \(operandStack)")
}
var displayValue: Double {
get {
return NSNumberFormatter().numberFromString(display.text!)!.doubleValue
}
set {
display.text = "\(newValue)"
userIsInTheMiddleOfTypingANumber = false
}
}
}
enter requires an input parameter but you didn't supply it with any. Replace it with enter(sender)
#IBAction func operate(sender: UIButton) {
let operation = sender.currentTitle!
if userIsInTheMiddleOfTypingANumber {
enter(sender)
}
switch operation {
case "x":
if operandStack.count >= 2 {
displayValue = operandStack.removeLast() * operandStack.removeLast()
enter(sender)
}
default: break
}
}