**Not quite sure why the view is not changing when the button Calculate
is pressed?
What are the possible reasons for that? Could you please help?
import UIKit
class CalculateViewController: UIViewController {
#IBOutlet weak var heightLabel: UILabel!
#IBOutlet weak var weightLabel: UILabel!
#IBOutlet weak var heightSlider: UISlider!
#IBOutlet weak var weightSlider: UISlider!
override func viewDidLoad() {
super.viewDidLoad()
// Do any additional setup after loading the view.
}
#IBAction func heightSlided(_ sender: UISlider) {
var currentHeightValue = sender.value
let roundedHeightValue = String(format: "%.2f", currentHeightValue)
heightLabel.text = "\(roundedHeightValue)m"
}
#IBAction func weightSlided(_ sender: UISlider) {
var currentWeightValue = sender.value
let roundedWeightValue = String(format: "%.0f", currentWeightValue)
weightLabel.text = "\(roundedWeightValue)kg"
}
#IBAction func calculateBMI(_ sender: UIButton) {
var squareOfHeight = Float(pow(heightSlider.value, 2.0))
var BMI = weightSlider.value / squareOfHeight
self.performSegue(withIdentifier: "goToResult", sender: self)
}
}
try this..
let storyBoard: UIStoryboard = UIStoryboard(name: "Name
Storyboard", bundle: nil)
if let push = storyBoard.instantiateViewController(withIdentifier: "Name Storyboar
ID") as? Name View Controller {
self.navigationController?.pushViewController(push, animated: true)
}
Related
The image is not from one VC to another VC.
The problem is displaying it to the image view in the main UIViewController. I have everything hooked up correctly in the Storyboard.
Click here to view my storyboard layout.
Please note some of my unnecessary code has been removed from both ViewController classes.
Here is my first UIViewController:
import UIKit
class ViewController: UIViewController, UINavigationControllerDelegate, UIImagePickerControllerDelegate {
var imagePicker: UIImagePickerController!
#IBAction func editPhoto(_ sender: UIButton) {
let ViewController2 = storyboard?.instantiateViewController(withIdentifier: "AddNewEaterySegue") as! ViewController2
ViewController2.imageForEdit = imageView.image!
print(imageView)
print(imageView.image!)
navigationController?.pushViewController(ViewController2, animated: true)
}
#IBOutlet weak var imageView: UIImageView! {
didSet {
imageView.contentMode = .scaleAspectFill
imageView.clipsToBounds = true
}
}
}
Here is my second UIViewController:
import UIKit
class ViewController2: UIViewController, UINavigationControllerDelegate, UIImagePickerControllerDelegate {
var filter : CIFilter!
var imageForEdit = UIImage()
var imagePicker: UIImagePickerController!
#IBOutlet weak var select: UISegmentedControl!
#IBOutlet weak var imageLabel: UIImageView!
#IBOutlet weak var textField: UITextField!
#IBAction func saveButtonPressed(_ sender: UIImage) {
if textField.text == "" {
print("Не все поля заполнены")
} else {
}
performSegue(withIdentifier: "unwindSegueFromViewController", sender: sender)
}
override func viewDidLoad() {
super.viewDidLoad()
imageLabel.image = imageForEdit
print(imageLabel)
// Do any additional setup after loading the view.
}
#IBAction func tappedEnter(_ sender: Any) {
if textField.text?.isEmpty ?? true {
return
} else {
if let texttxt = textField.text {
let data = texttxt.data(using: .ascii, allowLossyConversion: false)
if select.selectedSegmentIndex == 0
{
filter = CIFilter(name: "CICode128BarcodeGenerator")
} else {
filter = CIFilter(name: "CIQRCodeGenerator")
}
filter.setValue(data, forKey: "inputMessage")
let transform = CGAffineTransform(scaleX: 5, y: 5)
let image = UIImage(ciImage: filter.outputImage!.transformed(by: transform))
imageLabel.image = image
}
}
}
}
When you are pushing to ViewController2 your imageView in ViewController is empty.
Where exactly are you setting the image for imageView?
In your storyboard, the imageView in ViewController is empty and also in the didSet method for imageView in ViewController you have not set any image to the imageView.
Try this in ViewController:
#IBOutlet weak var imageView: UIImageView! {
didSet {
//Add a test image to your project.
imageView.image = UIImage(named: "YOUR_TEST_IMAGE_NAME.jpeg")
imageView.contentMode = .scaleAspectFill
imageView.clipsToBounds = true
}
}
EDIT: Ok I guess I was not clear on your question. So in order to send the image from "ViewController2" back to "ViewController", you can use many methods but the way I would do it is by using Protocols.
I have done it in a generic way but you can apply this to send any kind of data from one view controller back to the previous view controller.
Try this in ViewController:
import UIKit
protocol ImageViewProtocol{
func sendImageToViewController(theImage: UIImage)
}
class ViewController: UIViewController, ImageViewProtocol {
func sendImageToViewController(theImage: UIImage) {
imageView.image = theImage
}
#IBOutlet weak var imageView: UIImageView!
override func viewDidLoad() {
super.viewDidLoad()
let viewcontroller2 = storyboard?.instantiateViewController(withIdentifier: "viewcontroller2") as! ViewController2
viewcontroller2.delegate = self
self.navigationController?.pushViewController(viewcontroller2, animated: true)
}
}
Try this in ViewController2:
import UIKit
class ViewController2: UIViewController {
var delegate: ImageViewProtocol!
#IBOutlet weak var barcodeImageView: UIImageView!
override func viewDidLoad() {
super.viewDidLoad()
barcodeImageView.image = UIImage(named: "test_image.jpg")
}
#IBAction func saveButtonAction(_ sender: Any) {
delegate.sendImageToViewController(theImage: barcodeImageView.image!)
self.navigationController?.popViewController(animated: true)
}
}
I put a container inside my MainViewController. Then added FirstViewController inside that container
let containerView = UIView()
view.addSubview(containerView)
let controller = FirstViewController()
addChildViewController(controller)
containerView.addSubview(controller.view)
controller.didMove(toParentViewController: self)
There are a UITextField and a UIButton inside FirstViewController. There is a label inside SecondViewController and var passedText = "" to update the UILabel text. I just want to set the UILabel text according to the UITextField text from FirstViewController when I press UIButton and it should leads to SecondViewController as well. This is the UIButton action method from FirstViewController. I'm not using Storyboard
#IBAction func btnPressed(_ sender: Any) {
let secondVC = SecondViewController()
addChildViewController(secondVC)
view.addSubview(secondVC.view)
secondVC.view.frame = view.bounds
secondVC.view.autoresizingMask = [.flexibleWidth, .flexibleHeight]
secondVC.didMove(toParentViewController: self)
secondVC.passedText = inputTextField.text!
}
This is FirstViewController
class FirstViewController: UIViewController {
#IBOutlet weak var inputTextField: UITextField!
let secondVC = SecondViewController()
override func viewDidLoad() {
super.viewDidLoad()
}
#IBAction func btnPressed(_ sender: Any) {
addChildViewController(secondVC)
view.addSubview(secondVC.view)
secondVC.view.frame = view.bounds
secondVC.view.autoresizingMask = [.flexibleWidth, .flexibleHeight]
secondVC.didMove(toParentViewController: self)
secondVC.passedText = inputTextField.text!
}
}
This is SecondViewController
class SecondViewController: UIViewController {
var passedText = ""
#IBOutlet weak var label: UILabel!
override func viewDidLoad() {
super.viewDidLoad()
label.text = passedText
}
}
Closure
class ParentViewController: UIViewController {
var embeddedViewController: UIViewController?
override func viewDidLoad() {
super.viewDidLoad()
let firstViewController = FirstViewController()
embedViewController(firstViewController)
firstViewController.passDataClosure = { [weak self] text in
let secondViewController = SecondViewController()
self?.embedViewController(secondViewController)
secondViewController.passedText = text
}
}
func embedViewController(_ viewController: UIViewController) {
removeEmbedded()
viewController.view.autoresizingMask = [.flexibleHeight, .flexibleWidth]
addChildViewController(viewController)
view.addSubview(viewController.view)
viewController.didMove(toParentViewController: self)
embeddedViewController = viewController
}
func removeEmbedded() {
embeddedViewController?.view.removeFromSuperview()
embeddedViewController?.didMove(toParentViewController: nil)
embeddedViewController?.removeFromParentViewController()
}
}
-
class FirstViewController: UIViewController {
var passDataClosure: ((String?) -> Void)?
#IBOutlet weak var inputTextField: UITextField!
#IBAction func btnPressed(_ sender: Any) {
passDataClosure?(inputTextField.text)
}
}
-
class SecondViewController: UIViewController {
var passedText: String? {
didSet {
label.text = passedText
}
}
#IBOutlet weak var label: UILabel!
}
Delegate
class ParentViewController: UIViewController, FirstViewControllerDelegate {
var embeddedViewController: UIViewController?
override func viewDidLoad() {
super.viewDidLoad()
let firstViewController = FirstViewController()
embedViewController(firstViewController)
firstViewController.delegate = self
}
func embedViewController(_ viewController: UIViewController) {
removeEmbedded()
viewController.view.autoresizingMask = [.flexibleHeight, .flexibleWidth]
addChildViewController(viewController)
view.addSubview(viewController.view)
viewController.didMove(toParentViewController: self)
embeddedViewController = viewController
}
func removeEmbedded() {
embeddedViewController?.view.removeFromSuperview()
embeddedViewController?.didMove(toParentViewController: nil)
embeddedViewController?.removeFromParentViewController()
}
// MARK: FirstViewControllerDelegate
func firstViewController(_ firstViewController: FirstViewController, pass text: String?) {
let secondViewController = SecondViewController()
embedViewController(secondViewController)
secondViewController.passedText = text
}
}
-
class SecondViewController: UIViewController {
var passedText: String? {
didSet {
label.text = passedText
}
}
#IBOutlet weak var label: UILabel!
}
-
protocol FirstViewControllerDelegate: class {
func firstViewController(_ firstViewController: FirstViewController, pass text: String?)
}
class FirstViewController: UIViewController {
weak var delegate: FirstViewControllerDelegate?
#IBOutlet weak var inputTextField: UITextField!
#IBAction func btnPressed(_ sender: Any) {
delegate?.firstViewController(self, pass: inputTextField.text)
}
}
As far as I can see, this should work:
secondVC.label.text = inputTextField.text
You currently have secondVC.label = inputTextField.text which shouldn't even compile.
you can create a singleton class for your scenario. so that you can access all of your important data from anywhere either from your firstViewController or SecondViewController.
class YourDataClass : NSObject{
var textFieldData = String()
var lblSeconddata = String()
struct Static
{
public static var instance: YourDataClass?
}
class var singleton: YourDataClass
{
if Static.instance == nil
{
Static.instance = YourDataClass()
}
return Static.instance!
}
}
now somewhere in your controller
YourDataClass.Singleton.textFieldData = txtFld.Text
YourDataClass.Singleton. lblSeconddata = lblText.Text
in smame way you can get it anywhere
I have been having trouble synchronizing the values of two UISegments. The First UISegment is suppose to get updated based on the value of the second UISegment (which is in a different ViewController) and then update the value in its own segment based on what is selected in the second ViewController. However, the values are not transferring to the first UISegment, meaning the title and value is not being stored even though I am using the defaults and storing keys.
ViewController
import UIKit
class ViewController: UIViewController {
#IBOutlet weak var tipLabel: UILabel!
#IBOutlet weak var totalLabel: UILabel!
#IBOutlet weak var billField: UITextField!
#IBOutlet weak var tipController: UISegmentedControl!
#IBOutlet weak var splitController: UISegmentedControl!
#IBOutlet weak var splitLabel: UILabel!
let defaults = UserDefaults.standard
override func viewDidLoad() {
super.viewDidLoad()
defaults.synchronize()
billField.becomeFirstResponder()
billField.text = String(defaults.double(forKey: "bill_value"))
print(tipController.selectedSegmentIndex)
if billField.text == "" || (billField.text == nil) {
billField.placeholder = String(0.00)
}
billField.becomeFirstResponder()
tipController.selectedSegmentIndex = defaults.integer(forKey: "default_tip_index")
}
override func viewWillAppear(_ animated: Bool) {
tipController.selectedSegmentIndex = defaults.integer(forKey: "default_tip_index")
}
#IBAction func onTap(_ sender: Any) {
view.endEditing(true)
}
#IBAction func calculateTip(_ sender: Any) {
let tipPercentages = [0.18, 0.20, 0.25]
let splitNumbers = [1,2,3,4]
let bill = Double(billField.text!) ?? 0 //converts bill to double
defaults.set(bill, forKey: "bill_value") //Saves last bill input
let tip = bill * tipPercentages[tipController.selectedSegmentIndex]
let total = bill + tip
tipLabel.text = String(format: "$%.2f", tip)
totalLabel.text = String(format: "$%.2f", total)
splitLabel.text = String(format: "$%.2f", total/Double((splitNumbers[splitController.selectedSegmentIndex])))
}
}
SettingsViewController
class SettingsViewController: UIViewController {
var tipPercentageIndex:Int!
#IBOutlet weak var settingsTipController: UISegmentedControl!
let defaults = UserDefaults.standard
override func viewDidLoad() {
super.viewDidLoad()
let selectedDefaultPercent = defaults.integer(forKey: "default_tip_index")
settingsTipController.selectedSegmentIndex = selectedDefaultPercent
}
#IBAction func tipPercent(_ sender: Any) {
defaults.set(settingsTipController.selectedSegmentIndex, forKey: "default_tip_index")
defaults.synchronize()
}
#IBAction func splitNumber(_ sender: Any) {
}
#IBAction func Back(_ sender: Any) {
self.performSegue(withIdentifier: "Tippy2", sender: self)
}
}
Overall this simple application calculates the tip and updates the first UISegment when the settingsViewController is visited.
I have a problem I can't seem to solve myself, I have two view controllers, the first one contains three variables that stores integers. On my second view controller I have 3 sliders which manipulates a label under each slider with a number.
I want the numbers from these 3 sliders to replace the numbers that were set in the three variables on my first view controller when I click a button on the second view controller but when I when I type in the variable name it doesn't show up in the second view controller?
Can somebody explain what I may be doing wrong as I thought the variables were public and globally accessible throughout my app but I'm struggling to figure out what I'm doing wrong.
Here is some of my code:
import UIKit
import AVFoundation
class ViewController: UIViewController {
var timer = Timer()
var softTime = 180
var mediumTime = 300
var hardTime = 600
var chosenTime = 0
I want softTime, mediumTime & hardTime to be changed from the button in the next view controller:
import UIKit
class SettingsViewController: UIViewController {
#IBOutlet weak var softLabel: UILabel!
#IBOutlet weak var softSliderValue: UISlider!
#IBAction func softSlider(_ sender: Any) {
let currentValue = Int(softSliderValue.value)
softLabel.text = "\(currentValue)"
}
#IBOutlet weak var mediumLabel: UILabel!
#IBOutlet weak var mediumSliderValue: UISlider!
#IBAction func mediumSlider(_ sender: Any) {
let currentValue = Int(mediumSliderValue.value)
mediumLabel.text = "\(currentValue)"
}
#IBOutlet weak var hardLabel: UILabel!
#IBOutlet weak var hardSliderValue: UISlider!
#IBAction func hardSlider(_ sender: Any) {
let currentValue = Int(hardSliderValue.value)
hardLabel.text = "\(currentValue)"
}
#IBAction func setTimesButton(_ sender: Any) {
}
override func viewDidLoad() {
super.viewDidLoad()
// Do any additional setup after loading the view.
}
}
//in Second VC
protocol PassDataDelegte: class {
func your method(first: String, second: String, third: String)
}
weak var delegate: PassDataDelegte?
func youction button() {
delegate?.yourmethod(first, timeString: second, third: date)
}
// in First VC
override func prepareForSegue(segue: UIStoryboardSegue, sender: AnyObject?) {
if segue.identifier == "DeadlineSegue" {
let dvc = segue.destinationViewController as! YourSecondViewController
dvc.delegate = self
}
}
extension YourFirstViewController: PassDataDelegte {
func sendDateTime((first: String, second: String, third: String) {
print(first)
print(second)
print(third)
}
Hey guys I need some help here with my code, please take a look to the images to see what I see. I'm making a Tip Calculator Project in Swift and I must have a settings view where I select the default tip rate. I have some errors and I must fix that as soon as posible. I will really appreciate that some one corrects my code and test it. Below is the code of the two ViewControllers, I did not post the image of the Settings View Controller because the website does not let me post more than two links until I get more reputation.
The error in Xcode:
Storyboard: Check the images I have some errors at the first lines.
import UIKit
class ViewController: UIViewController, SettingDelegate {
// Inputs
#IBOutlet weak var amountTextField: UITextField!
//Labels
#IBOutlet weak var TipPercentageLabel: UILabel!
#IBOutlet weak var numberOfPersonLabel: UILabel!
#IBOutlet weak var tipAmountLabel: UILabel!
#IBOutlet weak var totalBillLabel: UILabel!
#IBOutlet weak var billPerPersonLabel: UILabel!
//Slider & Stepper
#IBOutlet weak var tipSlider: UISlider!
#IBOutlet weak var personsStepper: UIStepper!
//Variables
var tipPercentage : Double = NSUserDefaults.standardUserDefaults().doubleForKey("DefaultTipRate") ?? 0.20
var numberOfPerson:Int = 1
let numberFormatter:NSNumberFormatter = NSNumberFormatter()
override func viewDidLoad() {
super.viewDidLoad()
// Do any additional setup after loading the view, typically from a nib.
tipAmountLabel.text = "$0.00"
totalBillLabel.text = "Bill Total"
billPerPersonLabel.text = "$0.00"
TipPercentageLabel.text = "20.0%"
numberOfPersonLabel.text = "1"
self.amountTextField.becomeFirstResponder()
}
override func didReceiveMemoryWarning() {
super.didReceiveMemoryWarning()
// Dispose of any resources that can be recreated.
}
func setupContainer() {
tipSlider.minimumValue = 0
tipSlider.maximumValue = 100
tipSlider.value = 20
tipSlider.addTarget(self, action: "sliderTipChanged:", forControlEvents: .ValueChanged)
personsStepper.minimumValue = 1
personsStepper.maximumValue = 30
personsStepper.value = 1
personsStepper.addTarget(self, action: "sliderPersonChanged:", forControlEvents: .ValueChanged)
amountTextField.text = ""
refreshCalculation()
}
#IBAction func OnEditingFieldBill(sender: AnyObject) {
refreshCalculation()
}
func refreshCalculation() {
numberFormatter.numberStyle = NSNumberFormatterStyle.DecimalStyle
if let amount = numberFormatter.numberFromString(amountTextField.text!) as? Double {
let tipAmount = amount * tipPercentage
let totalBill = amount + tipAmount
let billPerPerson = totalBill / Double(numberOfPerson)
numberFormatter.numberStyle = NSNumberFormatterStyle.CurrencyStyle
tipAmountLabel.text = numberFormatter.stringFromNumber(tipAmount)
totalBillLabel.text = numberFormatter.stringFromNumber(totalBill)
billPerPersonLabel.text = numberFormatter.stringFromNumber(billPerPerson)
} else {
tipAmountLabel.text = "-"
totalBillLabel.text = "-"
billPerPersonLabel.text = "-"
}
numberFormatter.numberStyle = NSNumberFormatterStyle.PercentStyle
numberFormatter.minimumFractionDigits = 1
numberFormatter.maximumFractionDigits = 1
TipPercentageLabel.text = self.numberFormatter.stringFromNumber(tipPercentage)
numberOfPersonLabel.text = "\(numberOfPerson)"
}
#IBAction func sliderTipChanged(sender: UISlider) {
tipPercentage = Double(round(tipSlider.value)) / 100
refreshCalculation()
}
#IBAction func StepperPersonChanged(sender: UIStepper) {
numberOfPerson = Int(round(personsStepper.value))
refreshCalculation()
}
override func prepareForSegue(segue: UIStoryboardSegue, sender: AnyObject?) {
if let SettingsViewController = segue.destinationViewController as?SettingsViewController {
SettingsViewController.delegate = self
refreshCalculation()
}
}
}
The SettingsViewController below:
import UIKit
protocol SettingDelegate {
func tipPercentageChanged(newValue : Double)
}
class SettingsViewController: UIViewController {
var destName : String!
var delegate : SettingDelegate?
#IBOutlet weak var tipControl: UISegmentedControl!
override func viewDidLoad() {
super.viewDidLoad()
// Do any additional setup after loading the view.
}
override func didReceiveMemoryWarning() {
super.didReceiveMemoryWarning()
// Dispose of any resources that can be recreated.
}
#IBAction func DefaultRate(sender: AnyObject) {
var tipRates = [0.05, 0.10, 0.15, 0.20, 0.25, 0.30]
let tipRate = tipRates[tipControl.selectedSegmentIndex]
delegate?.tipPercentageChanged(tipRate)
NSUserDefaults.standardUserDefaults().setDouble(tipRate, forKey: "DefaultTipRate")
NSUserDefaults.standardUserDefaults().synchronize()
}
/
For your first error:
When a viewController conforms to a protocol, it needs to implements the methods the protocol implements. In your case, define you should have
func tipPercentageChanged(newValue : Double) {
//save the new value here
}
The first error should go away.
It looks like you are presenting the SettingsViewController using a modal transition, so you can use
self.dismissViewControllerAnimated(true, completion: {})