I'm new to Swift and Xcode overall,
I want to create a new public NSURL variable which I want to use later in my code to give it value and use that value later from it. like below :
class AddUrlViewController: NSViewController {
#IBOutlet weak var txtPath: NSTextField!
override func viewDidLoad() {
super.viewDidLoad()
}
#IBAction func btnFileDialog(sender: NSButton) {
let myFiledialog:NSOpenPanel = NSOpenPanel()
myFiledialog.canChooseDirectories = true
myFiledialog.canChooseFiles = false
var returnCode:NSInteger = myFiledialog.runModal()
if (returnCode == NSOKButton) {
/////////// Use it here
var directoryUrl = myFiledialog.URL?.absoluteURL
}
}
#IBAction func btnStart(sender: NSButton) {
//////////// Use it here
}
}
How should I achieve this the best way ?
Simply define the variable as a property outside of the function scope -
class AddUrlViewController: NSViewController {
#IBOutlet weak var txtPath: NSTextField!
var directoryUrl:NSURL?
override func viewDidLoad() {
super.viewDidLoad()
}
#IBAction func btnFileDialog(sender: NSButton) {
let myFiledialog:NSOpenPanel = NSOpenPanel()
myFiledialog.canChooseDirectories = true
myFiledialog.canChooseFiles = false
var returnCode:NSInteger = myFiledialog.runModal()
if (returnCode == NSOKButton) {
/////////// Use it here
self.directoryUrl = myFiledialog.URL?.absoluteURL
}
}
#IBAction func btnStart(sender: NSButton) {
if (self.directoryUrl != nil) {
//////////// Use it here
}
}
}
Related
Here's my code do not suggest to remove IBAction I'm a beginner making a browser. I'm also
pretty new to this program:
import Cocoa
import WebKit
class ViewController: NSViewController, WKNavigationDelegate {
#IBOutlet weak var webView: WKWebView!
override func viewDidLoad() {
super.viewDidLoad()
webView.navigationDelegate = self
// Do any additional setup after loading the view.
}
override var representedObject: Any? {
didSet {
}
}
#IBAction func didEnterKeyTapped( sender: NSTextField){
let urlString = sender.stringValue
guard let url = URL(string: urlString) else {return}
let urlRequest = URLRequest(url: url)
webView.load(urlRequest)
#IBAction func didnavigationButtonTapped ( sender: NSSegmentedControl){
if sender.selectedSegment == 0 {
webView.goBack()
}else {
webView.Forward()
}
}
func webView(_ webView: WKWebView, didCommit navigation: WKNavigation!) {
let currentUrl = webView.url?.absoluteString ?? ""
guard let windowController = view.window?.windowController as? WindowController else {return}
let textField = windowController.urlTextField
textField?.stringValue = currentUrl
}
}
}
You declared the #IBActions outside of the ViewController class. An IBAction must be a member of a class. Move the IBActions inside the class to fix the compiler error.
Another problem in your code is you declared the didNavigationButtonTapped IBAction inside the didEnterKeyTapped IBAction. The two IBActions should be separate functions, such as the following:
#IBAction func didEnterKeyTapped( sender: NSTextField){
let urlString = sender.stringValue
guard let url = URL(string: urlString) else {return}
let urlRequest = URLRequest(url: url)
webView.load(urlRequest)
}
#IBAction func didnavigationButtonTapped ( sender: NSSegmentedControl) {
if sender.selectedSegment == 0 {
webView.goBack()
}else {
webView.Forward()
}
}
I have a problem, I want to create a small app in which data in a formula can be charged.
Currently the data from three ViewControllers and one PickerViewController will be given back to the first ViewController.
That works very well too.
Now I want that the data at the start not on "nil" set but have a certain value.
Thereafter, the data entered last should reappear when the app is restarted.
I would like to apologize for my english, it is not my preferred language ...
Here is a part of my code how I wrote it
Main ViewController:
import UIKit
class RecivingViewController: UIViewController, SendDataBack, SendDataBack2, SendDataBack3, SendDataBack4 {
#IBOutlet weak var recivingData: UILabel!
#IBOutlet weak var recivingData2: UILabel!
#IBOutlet weak var recivingData3: UILabel!
#IBOutlet weak var recivingData4: UILabel!
override func viewDidLoad() {
super.viewDidLoad()
// Do any additional setup after loading the view.
}
func userData(data: String) {
recivingData.text = data
}
func userData2(data: String) {
recivingData2.text = data
}
func userData3(data: String) {
recivingData3.text = data
}
func PickerData(data: String){
recivingData4.text = data
}
override func didReceiveMemoryWarning() {
super.didReceiveMemoryWarning()
// Dispose of any resources that can be recreated.
}
override func prepare(for segue: UIStoryboardSegue, sender: Any?) {
if segue.identifier == "view1" {
let SendingVC: SendingViewController = segue.destination as! SendingViewController
SendingVC.delegate = self
}
if segue.identifier == "view2" {
let SendingVC2: Sending2ViewController = segue.destination as! Sending2ViewController
SendingVC2.delegate = self
}
if segue.identifier == "view3" {
let SendingVC3: Sending3ViewController = segue.destination as! Sending3ViewController
SendingVC3.delegate = self
}
if segue.identifier == "picker" {
let SendingVC4: PickerViewController = segue.destination as! PickerViewController
SendingVC4.delegate = self
}
}
}
one of the other ViewControllers:
import UIKit
protocol SendDataBack {
func userData(data: String)
}
class SendingViewController: UIViewController {
#IBOutlet weak var DataTxt: UITextField!
var delegate: SendDataBack? = nil
#IBAction func done(_ sender: Any) {
if delegate != nil {
if DataTxt.text != nil {
let data = DataTxt.text
delegate?.userData(data: data!)
dismiss(animated: true, completion: nil)
}
}
}
In order to see data after app is restarted you should use user defaults.
For saving data
UserDefaults.standard.set(newValue, forKey: "data")
For loading data in your view controller, if it's first load, when data is nil
UserDefaults.standard.string(forKey: "data")
how to show or hide a image in Swift by taping on a Button?
For example:
i have ImageA and ImageB and one Button which i want to use to move ImageA to ImageB and back to ImageA and so on..
It works perfect to move from ImageA to ImageB, but how can i move back to ImageA?
My code is:
import UIKit
class ViewController: UIViewController {
#IBOutlet weak var Bild1: UIImageView!
#IBOutlet weak var Bild2: UIImageView!
#IBAction func pressedButton(sender: AnyObject) {
Bild1.hidden = true
Bild2.hidden = false
}
override func viewDidLoad() {
super.viewDidLoad()
Bild1.hidden = false
Bild2.hidden = true
// Do any additional setup after loading the view, typically from a nib.
}
override func didReceiveMemoryWarning() {
super.didReceiveMemoryWarning()
// Dispose of any resources that can be recreated.
}
}
override func viewDidLoad()
{
super.viewDidLoad()
Bild1.isHidden = false
Bild2.isHidden = true
// Do any additional setup after loading the view, typically from a nib.
}
#IBAction func pressedButton(sender: AnyObject)
{
Bild1.isHidden = !Bild1.isHidden
Bild2.isHidden = !Bild2.isHidden
}
#IBAction func pressedButton(sender: AnyObject) {
Bild1.isHidden = !Bild1.isHidden
Bild2.isHidden = !Bild2.isHidden
}
This will toggle the image property between show and hidden.
Syntax is Swift4 compatible
try replacing with:
#IBAction func pressedButton(sender: AnyObject) {
if Bild1.hidden {
Bild1.hidden = false
Bild2.hidden = true
} else {
Bild1.hidden = true
Bild2.hidden = false
}
}
#IBAction func pressedButton(sender: AnyObject) {
Bild1.hidden = !Bild1.hidden
Bild2.hidden = !Bild2.hidden
}
I have just a camera on my CameraController. I want the picture from my CameraContoller to go to my ComposeViewController inside of the image View in the ComposeViewController. so basically I need it so the the picture taken transfers to the other view controller once taken. There are 2 separate view controllers below in the code.
Code:
import UIKit
import AVFoundation
class CameraController : UIViewController, UIImagePickerControllerDelegate, UINavigationControllerDelegate{
var captureSession : AVCaptureSession?
var stillImageOutput : AVCaptureStillImageOutput?
var previewLayer : AVCaptureVideoPreviewLayer?
#IBOutlet var cameraView: UIView!
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.
}
override func viewDidAppear(animated: Bool) {
super.viewDidAppear(animated)
previewLayer?.frame = cameraView.bounds
}
override func viewWillAppear(animated: Bool) {
super.viewWillAppear(animated)
captureSession = AVCaptureSession()
captureSession?.sessionPreset = AVCaptureSessionPreset1920x1080
var backCamera = AVCaptureDevice.defaultDeviceWithMediaType(AVMediaTypeVideo)
var error : NSError?
var input = AVCaptureDeviceInput(device: backCamera, error: &error)
if (error == nil && captureSession?.canAddInput(input) != nil){
captureSession?.addInput(input)
stillImageOutput = AVCaptureStillImageOutput()
stillImageOutput?.outputSettings = [AVVideoCodecKey : AVVideoCodecJPEG]
if (captureSession?.canAddOutput(stillImageOutput) != nil){
captureSession?.addOutput(stillImageOutput)
previewLayer = AVCaptureVideoPreviewLayer(session: captureSession)
previewLayer?.videoGravity = AVLayerVideoGravityResizeAspect
previewLayer?.connection.videoOrientation = AVCaptureVideoOrientation.Portrait
cameraView.layer.addSublayer(previewLayer)
captureSession?.startRunning()
}
}
}
#IBOutlet var tempImageView: UIImageView!
func didPressTakePhoto(){
if let videoConnection = stillImageOutput?.connectionWithMediaType(AVMediaTypeVideo){
videoConnection.videoOrientation = AVCaptureVideoOrientation.Portrait
stillImageOutput?.captureStillImageAsynchronouslyFromConnection(videoConnection, completionHandler: {
(sampleBuffer, error) in
if sampleBuffer != nil {
var imageData = AVCaptureStillImageOutput.jpegStillImageNSDataRepresentation(sampleBuffer)
var dataProvider = CGDataProviderCreateWithCFData(imageData)
var cgImageRef = CGImageCreateWithJPEGDataProvider(dataProvider, nil, true, kCGRenderingIntentDefault)
var image = UIImage(CGImage: cgImageRef, scale: 1.0, orientation: UIImageOrientation.Right)
self.tempImageView.image = image
self.tempImageView.hidden = false
}
})
}
}
var didTakePhoto = Bool()
func didPressTakeAnother(){
if didTakePhoto == true{
tempImageView.hidden = true
didTakePhoto = false
}
else{
captureSession?.startRunning()
didTakePhoto = true
didPressTakePhoto()
}
}
override func touchesBegan(touches: Set<NSObject>, withEvent event: UIEvent) {
didPressTakeAnother()
}
}
//-----Below is my Next View Controller where i want the image from the above view controller to show up--------------------------------------- --------------------------------------------------------------------------- --------------
class ComposeViewController: UIViewController, UIImagePickerControllerDelegate, UINavigationControllerDelegate, UITextViewDelegate {
#IBOutlet weak var captionTextView: UITextView!
#IBOutlet weak var previewImage: UIImageView!
let tap = UITapGestureRecognizer()
override func viewDidLoad() {
super.viewDidLoad()
var swipe: UISwipeGestureRecognizer = UISwipeGestureRecognizer(target: self, action: "GotoProfile")
swipe.direction = UISwipeGestureRecognizerDirection.Right
self.view.addGestureRecognizer(swipe)
tap.numberOfTapsRequired = 2
tap.addTarget(self, action: "GoBack")
view.userInteractionEnabled = true
view.addGestureRecognizer(tap)
captionTextView.delegate = self
// Do any additional setup after loading the view.
}
override func didReceiveMemoryWarning() {
super.didReceiveMemoryWarning()
// Dispose of any resources that can be recreated.
}
func CaptonField(textField: UITextField, shouldChangeCharactersInRange range: NSRange, replacementString string: String) -> Bool {
if range.length + range.location > count(captionTextView.text){
return false
}
let NewLength = count(captionTextView.text) + count(string) - range.length
return NewLength <= 35
}
#IBAction func chooseImageFromCamera() {
let picker = UIImagePickerController()
picker.delegate = self
picker.sourceType = .Camera
presentViewController(picker,animated: true, completion:nil)
}
func GotoProfile(){
self.performSegueWithIdentifier("NewCameraViewFromComposeSegue", sender: nil)
}
func GoBack(){
self.performSegueWithIdentifier("GoBackFromCamerasegue", sender: nil)
}
#IBAction func addImageTapped(sender: AnyObject) {
let imagePicker = UIImagePickerController()
imagePicker.delegate = self
imagePicker.sourceType = UIImagePickerControllerSourceType.PhotoLibrary
imagePicker.mediaTypes = UIImagePickerController.availableMediaTypesForSourceType(.PhotoLibrary)!
imagePicker.allowsEditing = false
self.presentViewController(imagePicker, animated: true, completion: nil)
}
func imagePickerController(picker: UIImagePickerController, didFinishPickingImage image: UIImage!, editingInfo: [NSObject : AnyObject]!) {
self.previewImage.image = image
self.dismissViewControllerAnimated(true, completion: nil)
}
func textViewShouldEndEditing(textView: UITextView) -> Bool {
captionTextView.resignFirstResponder()
return true;
}
#IBAction func composeTapped(sender: AnyObject) {
let date = NSDate()
let dateFormatter = NSDateFormatter()
dateFormatter.timeStyle = NSDateFormatterStyle.ShortStyle
dateFormatter.dateStyle = NSDateFormatterStyle.ShortStyle
let localDate = dateFormatter.stringFromDate(date)
let imageToBeUploaded = self.previewImage.image
let imageData = UIImagePNGRepresentation(imageToBeUploaded)
let file: PFFile = PFFile(data: imageData)
let fileCaption: String = self.captionTextView.text
var photoToUpload = PFObject(className: "Posts")
photoToUpload["Image"] = file
photoToUpload["Caption"] = fileCaption
photoToUpload["addedBy"] = PFUser.currentUser()?.username
photoToUpload["date"] = localDate
photoToUpload.save()
println("Successfully Posted.")
let vc: AnyObject? = self.storyboard?.instantiateViewControllerWithIdentifier("NavigationController")
self.presentViewController(vc as! UIViewController, animated: true, completion: nil)
}
}
Are you using a segue to get from the first to the second ViewController ?
If so you can access the second VC in in your first VC in the prepareForSegue function :
override func prepareForSegue(segue: UIStoryboardSegue, sender: AnyObject?) {
if segue.identifier == "ComposeVCIdentifier" {
let composeViewController = segue.destinationViewController as! ComposeViewController
composeViewController.someVariable = myPicture
}
}
I have 2 ViewControllers: ViewController1, ViewController2. An "Add" button in ViewController1 will bring up ViewController2. User will then enter in values into ViewController2 which will then be passed back into ViewController1 by prepareforsegue. These values are then append onto the properties of type array in viewcontroller1.
This is being repeated, whereby the user continue pressing the add button to bring up ViewController2 from ViewController1, and then add in new values to be appended onto the properties of array type in ViewController1 via prepareforsegue.
However this is not the case after the first set of values being appended from ViewController2. The second set of values will overwrite the first set of values.
Example.
After the first passed -> force =[1], stiffness[1]
After the second passed -> force=[2], stiffness[2]
I will want this -> force = [1,2], stiffness[1,2]
I want to continue adding until -> force = [1,2,3,4,5], stiffness[1,2,3,4,5]
ViewController1
class ViewController1: UITableViewController, UITableViewDataSource {
var force = [Float]()
var stiffness = [Float] ()
#IBAction func Add(sender: AnyObject) { }
}
ViewController2
class ViewController2: UIViewController {
var forceVar : Float = 0.0
var stiffVar : Float = 0.0
#IBAction func submit(sender: AnyObject) {
self.performSegueWithIdentifier("springSubmit", sender: sender)
}
override func prepareForSegue(segue: UIStoryboardSegue, sender: AnyObject!) {
if(segue.identifier == "springSubmit") {
var svcSubmitVariables = segue.destinationViewController as ViewController1
svcSubmitVariables.force.append(forceVar)
svcSubmitVariables.stiffness.append(stiffVar)
}
The performSegueWithIdentifier method will always initialize new view controller so in your example view controller that showed ViewController2 is different object from object initialized after submitting data and ofc this newly initialized object will have only initialize values. To achieve what you are looking for you will need to declare a function on your ViewController1 that will append data to your arrays, pass that function to ViewController2 and call it on submit method so your view controllers would look similar like these:
ViewController1
class ViewController1: UITableViewController, UITableViewDataSource {
var force = [Float]()
var stiffness = [Float] ()
override func viewWillAppear(animated: Bool) {
//check if values are updated
println(force)
println(stiffness)
}
#IBAction func Add(sender: AnyObject) {
self.performSegueWithIdentifier("viewController2", sender: sender)
}
override func prepareForSegue(segue: UIStoryboardSegue, sender: AnyObject!) {
if(segue.identifier == "viewController2") {
var addVariables = segue.destinationViewController as ViewController2
addVariables.submitFunc = appendData
}
}
func appendData(newForce:Float,newStiffness:Force){
force.append(newForce)
stiffness.append(newStiffness)
}
}
ViewController2
class ViewController2: UIViewController {
var forceVar : Float = 0.0
var stiffVar : Float = 0.0
var submitFunc:((newForce:Float,newStiff:Float)->())!
#IBAction func submit(sender: AnyObject) {
submitFunc(forceVar,stiffVar)
self.dismissViewControllerAnimated(false, completion: nil)
}
}
ViewController
import UIKit
class ViewController: UITableViewController, UITableViewDataSource {
var springNumber:NSInteger = 0
var force = [Float]()
var stiffness = [Float] ()
// MARK: UITableViewDataSource
override func numberOfSectionsInTableView(tableView: UITableView) -> Int {
return 1
}
override func tableView(tableView: UITableView,
numberOfRowsInSection section: Int) -> Int {
return springNumber
}
override func tableView(tableView: UITableView,
cellForRowAtIndexPath
indexPath: NSIndexPath) -> UITableViewCell {
let cell = tableView.dequeueReusableCellWithIdentifier("Cell")
as UITableViewCell
cell.textLabel!.text = "Spring \(indexPath.row)"
return cell
}
func fwall() -> Float {
for rows in 0..<(springNumber+1) {
force[0] = force[0] + force[rows]
}
force[0] = -(force[0])
return force[0]
}
override func viewWillAppear(animated: Bool) {
super.viewWillAppear(animated)
title = "Springs' Variables"
tableView.registerClass(UITableViewCell.self,
forCellReuseIdentifier: "Cell")
if(springNumber==0) {
force.append(0.0) }
println(force)
println(stiffness)
}
override func didReceiveMemoryWarning() {
super.didReceiveMemoryWarning()
// Dispose of any resources that can be recreated.
}
//Adding Values
#IBAction func Add(sender: AnyObject) {
self.performSegueWithIdentifier("addSpring", sender: sender)
}
#IBAction func solve_Pressed(sender: AnyObject) {
self.fwall()
self.performSegueWithIdentifier("Solve", sender: sender)
}
func appendData (newForce: Float, newStiffness:Float, newSpring: NSInteger) {
force.append(newForce)
stiffness.append(newStiffness)
springNumber = newSpring
println(springNumber)
println(force)
println(stiffness)
}
override func prepareForSegue ( segue: UIStoryboardSegue, sender: AnyObject!) {
if (segue.identifier == "addSpring") {
var addVariables = segue.destinationViewController as SpringTableViewControllerInsertVariables
addVariables.submitFunc = appendData
}
if (segue.identifier == "Solve") {
var svcViewController2 = segue.destinationViewController as ViewController2
svcViewController2.forceView2 = self.force
svcViewController2.stiffView2 = self.stiffness
svcViewController2.springNumView2 = self.springNumber
}
if (segue.identifier == "showDetail") {
}
}
}
Code for springTableViewControllerInsertVariables
import UIKit
class SpringTableViewControllerInsertVariables: UIViewController {
var forceVar : Float = 0.0
var stiffVar : Float = 0.0
var springNum : NSInteger = 0
var submitFunc: ((newForce:Float,newStiff:Float,newSpring:NSInteger)->())!
#IBOutlet weak var image: UIImageView!
var imageArray :[UIImage] = [UIImage(named: "springAtWall.jpg")!, UIImage(named:"spring.jpg")!]
override func viewDidLoad() {
if(springNum == 0) {image.image = imageArray[0] }
else {image.image = imageArray[1] }
}
#IBOutlet weak var force: UILabel!
#IBOutlet weak var forceEntered: UITextField!
#IBOutlet weak var stiffness: UILabel!
#IBOutlet weak var stiffnessEntered: UITextField!
#IBAction func checkboxed(sender: AnyObject) {
//when checkedboxed is checked here.
//1)UIImage is changed
//2)calculate2 function is used for calculate1
}
#IBAction func submit(sender: AnyObject) {
//might not work because springNum will be initialise to zero when this viewcontroller starts...
forceVar = (forceEntered.text as NSString).floatValue
stiffVar = (stiffnessEntered.text as NSString).floatValue
springNum = springNum + 1
submitFunc(newForce: forceVar ,newStiff: stiffVar, newSpring: springNum)
self.dismissViewControllerAnimated(false, completion: nil)
}
}