let verbList: [String] = ["hacer", "ser", "estar"]
let POVList: [String] = ["él / usted","ella / usted","ellas / ustedes","ellos / ustedes","tú","yo","nosotros",]
let correctConjugation: [[String]] = [["hace","hace","hacen","hacen","haces","hago","hacemos"], ["es","es","son","son","eres","soy","somos"], ["está","está","estan","estan","estas","estoy","estamos"]]
func randomVerb() -> Int { //creates and returns a random number for the prefix arrray
var randomVerb = Int(arc4random_uniform(3))
return randomVerb
}
func randomPrefix() -> Int { //creates and returns a random number for the verb array
var randomPrefix = Int(arc4random_uniform(7))
return randomPrefix
}
#IBAction func changeVerb(sender: AnyObject) {
Verb.text = verbList[randomVerb()]
POV.text = POVList[randomPrefix()]
userResponse.backgroundColor = UIColor.whiteColor()
userResponse.text = ""
}
#IBAction func checkResponse(sender: AnyObject) {
var userResponseA: String
userResponseA = userResponse.text
if (userResponseA == correctConjugation[randomVerb()[randomPrefix()]]){
userResponse.backgroundColor = UIColor.greenColor()
} else {
userResponse.backgroundColor = UIColor.redColor()
}
}
So I get two errors here (in the if statement in checkResponse): first, "int does not have a member named 'subscript'" and if I just take out the call for the function in the if statement I get: "'String' is not convertible to 'Mirror Disposition'"
I really have no idea why this is not working. Bear with me, as I am an Xcode noob just trying to get a better grade in spanish.
Very close - just need to have your subscripts separated:
if (userResponseA == correctConjugation[randomVerb()][randomPrefix()]) {
// ...
}
When working with an array of arrays (in this case correctConjugation), each subscript takes you one level down.
For the other issue, you want a couple variables to hold the current verb and prefix indexes:
class VC: UIViewController {
// list declarations here
var verbIndex = 0
var povIndex = 0
#IBAction func changeVerb(sender: AnyObject) {
verbIndex = randomVerb()
povIndex = randomPrefix()
Verb.text = verbList[verbIndex]
POV.text = POVList[povIndex]
userResponse.backgroundColor = UIColor.whiteColor()
userResponse.text = ""
}
#IBAction func checkResponse(sender: AnyObject) {
var userResponseA = userResponse.text
if (userResponseA == correctConjugation[verbIndex][povIndex]){
userResponse.backgroundColor = UIColor.greenColor()
} else {
userResponse.backgroundColor = UIColor.redColor()
}
}
}
Related
Need help in figuring out why my function is not executing when I thought it should but it executed after the completion block in the code. I am fairly new to Xcode so please excuse me if things sound confusing here. Below is my code.
class ImageDownloader{
typealias completionHandler = (Result<Set<ARReferenceImage>, Error>) -> ()
typealias ImageData = (image: UIImage, orientation: CGImagePropertyOrientation, physicalWidth: CGFloat, name: String)
static let URLDic = [ReferenceImagePayload]()
class func getDocumentData(completion:#escaping ([ReferenceImagePayload]) -> ()) {
var documentCollection: [ReferenceImagePayload] = []
db.collection("Users").getDocuments {(snapshot, error) in
if error == nil && snapshot != nil {
var index = 0
for document in snapshot!.documents {
let loadData = document.data()
index += 1
if loadData["Target URL"] != nil {
let url = loadData["Target URL"]
let urlString = URL(string: "\(String(describing: url ?? ""))")
let urlName = loadData["Target Image"]
documentCollection.append(ReferenceImagePayload(name: urlName as! String, url: urlString!))
if snapshot!.documents.count == index {
// After finished, send back the loaded data
completion(documentCollection)
}
}
}
}
}
}
static var receivedImageData = [ImageData]()
class func downloadImagesFromPaths(_ completion: #escaping completionHandler) {
// THE LINE BELOW WHERE I CALL THE FUNCTION IS NOT EXECUTED WHEN THIS CLASS IS INITIALLY CALLED. BUT AS THE CODE RUNS, THIS LINE BELOW IS EXECUTED AFTER THE COMPLETIONOPERATION = BLOCKOPERATION IS COMPLETED.
let loadedDataDic: () = getDocumentData { (URLDic) in
print(URLDic.self, "Got it")
}
let operationQueue = OperationQueue()
operationQueue.maxConcurrentOperationCount = 6
let completionOperation = BlockOperation {
OperationQueue.main.addOperation({
completion(.success(referenceImageFrom(receivedImageData)))
// LINE "let loadedDataDic: () = getDocumentData" ONLY GOT EXECUTED AT THIS POINT
})
}
URLDic.forEach { (loadData) in
let urlstring = loadData.url
let operation = BlockOperation(block: {
do{
let imageData = try Data(contentsOf: loadData.url)
print(imageData, "Image Data")
if let image = UIImage(data: imageData){
receivedImageData.append(ImageData(image, .up, 0.1, loadData.name))
}
}catch{
completion(.failure(error))
}
})
completionOperation.addDependency(operation)
}
operationQueue.addOperations(completionOperation.dependencies, waitUntilFinished: false)
operationQueue.addOperation(completionOperation)
}
}
I have a core data / document-driven macOS app, using Swift and I struggle on combining the out-of-the-box spell checking API with an NSDocument (NSPersistentDocument in my case)
It took me more time than it should take, but this is what I got, mostly guided by this great answer:
class VTDocument: NSPersistentDocument, NSChangeSpelling {
[...]
private let spellchecker = SpellChecker()
#IBAction func showGuessPanel(_ sender: Any?){
spellchecker.startSpellCheck(nodes: Array(db.nodes), tag: 0)
}
#IBAction #objc func changeSpelling(_ sender: Any?){
spellchecker.replace(with: "Test")
}
This is leading me to see the NSSpellChecker.spellingPanel, correctly showing the word to correct. However, the changeSpelling function should be "called" by the panel but is never called. The above spellChecker is a simple wrapper around the NSSpellChecker that keeps the status between function calls.
The SpellChecker class looks like this.
import Cocoa
class SpellChecker {
let checker = NSSpellChecker.shared
let count: UnsafeMutablePointer<Int> = UnsafeMutablePointer<Int>.allocate(capacity: 1)
var nodes = Array<Node> ()
var nodeNr = 0
var stringPos = 0
var range: NSRange = NSRange()
func startSpellCheck(nodes: [Node], tag: Int ) {
self.nodes = nodes
nodeNr = 0
stringPos = 0
continueChecking()
}
func continueChecking(){
if nodes.count == 0 {
return
}
if nodeNr >= nodes.count {
checker.updateSpellingPanel(withMisspelledWord: "")
checker.spellingPanel.orderFront(self)
return
}
if let nodeText = nodes[nodeNr].label {
range = checker.checkSpelling(of: nodeText, startingAt: stringPos, language: nil, wrap: false, inSpellDocumentWithTag: 0, wordCount: count)
if count.pointee > 0 {
stringPos = range.lowerBound
checker.updateSpellingPanel(withMisspelledWord: nodeText[range])
checker.spellingPanel.orderFront(self)
return
}
}
nodeNr = nodeNr + 1
continueChecking()
}
func replace(with: String){
if let nodeText = nodes[nodeNr].label {
let text = nodeText as NSString
text.replacingCharacters(in: range, with: with)
nodes[nodeNr].label = text as String
}
}
}
I am getting this error which I cannot explain:
#IBOutlet weak var licencePlateLabel: UILabel!
var editItem: CarValues? {
didSet {
// Update the view.
self.configureView()
}
}
func configureView() {
// Update the user interface for the detail item.
if let editedCar = self.editItem {
if let licencePlate = self.licencePlateLabel {
licencePlate.text? = editedCar.licencePlate!//this gives me nil
}
else {
print("value was nil")
}
print(editedCar.licencePlate!)//this is giving me the correct value
}
if I replace the
if let licencePlate = self.licencePlateLabel {
licencePlate.text! = editedCar.licencePlate!
}//this throws an error "found nil......"
even if I do this I m still getting the "found nil..."
func configureView() {
licencePlateLabel.text = "test"
[...]
}
BUT if I put the above on viewDidLoad then it works fine
override func viewDidLoad() {
licencePlateLabel.text = "test"
[...]
}
What is going on in this code?
EDIT
I am passing the value of the editItem from the detailView to the EditView like this:
#IBAction func editButtonTapped(sender: AnyObject) {
let storyBoard = UIStoryboard(name: "Main", bundle:nil)
let editScreen = storyBoard.instantiateViewControllerWithIdentifier("ID_EditViewController")
self.navigationController?.pushViewController(editScreen, animated: true)
let controller = EditViewController()
controller.editItem = detailItem
controller.navigationItem.leftBarButtonItem = self.splitViewController?.displayModeButtonItem()
controller.navigationItem.leftItemsSupplementBackButton = true
}
You don't unwrap properties to set them, only to read from them. So your code can simply be:
if let licencePlate = self.licencePlateLabel {
licencePlate.text = editedCar.licencePlate
}
Note that because licencePlate.text is an optional value anyway, there is also no need to unwrap editedCar.licencePlate. It's ok to use its value whether it is nil or contains a String.
i´m writing an input text quiz app, and i have an array of Int where i can store if answer was correct or not with 0 or 1 and also i have 3 textfields where i write the answers, and i want to change the textfields back ground color to red or green depending on the answers variable ,, if index variable its 1 change color to green and if is 0 change color to red.. this is what i have
#IBOutlet var textField1: UITextField!
#IBOutlet var textField2: UITextField!
#IBOutlet var textField3: UITextField!
//change int to 1 if answer was correct (3, ea for each textfield)
var answers = [0,0,0]
#IBAction func button(sender: AnyObject) {
for (index, answer) in goodAnswers.enumerate() {
print (answer)
if answer != 0 {
print ("ok")
} else {
print("not ok")
}
}
}
thanks !
You need something like this:
var goodAnswers = ["One", "Two", "Three"]
var textFields:[Int:UITextField]!
override func viewDidLoad() {
super.viewDidLoad()
self.textFields = [0:textField, 1:textField2]
}
#IBAction func btnClick(sender: AnyObject) {
for(index, answer) in goodAnswers.enumerate() {
if textFields[index]?.text == answer {
textFields[index]?.backgroundColor = UIColor.greenColor()
}
else {
textFields[index]?.backgroundColor = UIColor.redColor()
}
}
}
UPDATE:
If you want to have another good answers simply change your code to like this:
Declare new property:
var collectionOfGoodAnswers: [Int : [String]]!
and in viewDidLoad() method:
self.collectionOfGoodAnswers = [0: ["Hello", "World"],
1: ["Welcome", "Friend"]]
and then implement the click action:
#IBAction func btnClick(sender: AnyObject) {
for(index, _) in collectionOfGoodAnswers.enumerate() {
guard let goodAnswer = collectionOfGoodAnswers[index] else { return }
guard let answer = textFields[index] else { return }
guard let text = answer.text else { return }
if goodAnswer.contains(text) {
textFields[index]?.backgroundColor = UIColor.greenColor()
}
else {
textFields[index]?.backgroundColor = UIColor.redColor()
}
}
}
hope it helps.
I am trying to show the route between a MKPointAnnotation and user's current location, but i am fail with it.
My idea is: getting user's current location -> getting the MKPointAnnotation' Coordinate -> line up with MKPolylineRenderer
The problem is that i cannot find the problem. :( I have no idea where i should modify.
class MapInSearch: UIViewController, MKMapViewDelegate, CLLocationManagerDelegate {
#IBOutlet weak var mapView: MKMapView!
var destination: MKMapItem?
var coords: CLLocationCoordinate2D?
let locationManager = CLLocationManager()
var PlaceLat = ""
var PlaceLong = ""// get from previous view controller
override func viewDidLoad() {
super.viewDidLoad()
self.locationManager.requestAlwaysAuthorization()
// For use in foreground
self.locationManager.requestWhenInUseAuthorization()
if CLLocationManager.locationServicesEnabled() {
locationManager.delegate = self
locationManager.desiredAccuracy = kCLLocationAccuracyNearestTenMeters
locationManager.startUpdatingLocation()
}// step 1
self.mapView.showsUserLocation = true
self.mapView.delegate = self
self.addRoute() // step 2
}
func addRoute() {
var pointsToUse: [CLLocationCoordinate2D] = []
if PlaceLat != "" || PlaceLong != "" {
let coords = "\(PlaceLat), \(PlaceLong)"
let p = CGPointFromString(coords)
pointsToUse += [CLLocationCoordinate2DMake(CLLocationDegrees(p.x), CLLocationDegrees(p.y))]
}
pointsToUse += [CLLocationCoordinate2DMake(CLLocationDegrees(coords!.latitude), CLLocationDegrees(coords!.longitude))]
let myPolyline = MKPolyline(coordinates: &pointsToUse, count: 2)
mapView.addOverlay(myPolyline)
}
func mapView(mapView: MKMapView, rendererForOverlay overlay: MKOverlay) -> MKOverlayRenderer {
let lineView = MKPolylineRenderer(overlay: overlay)
lineView.strokeColor = UIColor.greenColor()
return lineView // step 3
}
func locationManager(manager: CLLocationManager, didUpdateLocations locations: [CLLocation]) {
self.coords = manager.location!.coordinate
print("locations = \(coords!.latitude) \(coords!.longitude)")
}
My code is very disorderly because i mixed 4-5 tutorials. Also, these tutorials is written with swift 1.2.(i have tried to edit it to swift 2, but i am fail)
Did you ever resolve your problem? Using the latest iteration of Swift 2 in XCode 7.3, in your view (we will call it MyViewController):
override func viewWillAppear(animated: Bool) {
super.viewWillAppear(animated)
self.mapView.delegate = self
var coordinates : [CLLocationCoordinate2D] = [];
addRoute(coordinates);
}
func addRoute(coordinates: [CLLocationCoordinate2D]) {
// insert your code to populate coordinates array with your coordinates
polyLine = MKPolyline(coordinates: &coordinates, count: coordinates.count)
self.mapView.addOverlay(polyLine, level: MKOverlayLevel.AboveRoads)
}
Then in the same file:
extension MyViewController: MKMapViewDelegate {
func mapView(mapView: MKMapView, rendererForOverlay overlay: MKOverlay) -> MKOverlayRenderer {
let pr = MKPolylineRenderer(overlay: overlay);
pr.strokeColor = UIColor.blueColor().colorWithAlphaComponent(0.5);
pr.lineWidth = 5;
return pr;
}
}
You may find the important part was the extension. I haven't tested this code, so feel free to correct any issues that crept in.
in your CLLocationManagerDelegate delegate function didUpdateLocations you can update your location by setting
self.myLocation = locations[0] as CLLocation
Then call MakeRoute() - This is a function i wrote to either make a route by car or by walking (hence the self.driveIsSet)
func makeRoute() {
let startPlaceMark = MKPlacemark(coordinate: myLocation.coordinate)
let endPlaceMark = MKPlacemark(coordinate: restLocation.coordinate)
let startMapItem = MKMapItem(placemark: startPlaceMark)
let endMapItem = MKMapItem(placemark: endPlaceMark)
let directionRequest = MKDirectionsRequest()
directionRequest.source = startMapItem
directionRequest.destination = endMapItem
if self.driveIsSet {
directionRequest.transportType = .automobile
} else {
directionRequest.transportType = .walking
}
let directions = MKDirections(request: directionRequest)
directions.calculate { (routeResponse, routeError) in
guard let routeResponse = routeResponse else {
if let routeError = routeError {
print(routeError)
}
return
}
self.mapView.removeOverlays(self.mapView.overlays)
let route = routeResponse.routes[0]
self.mapView.add(route.polyline, level: .aboveRoads)
}
}