I am trying to get the splash view ( back_button ) to remove itself once the webpage fully loads, I had done quite a bit of researching and they always point to the same code as an answer. However, mine will not get called. Can somebody advise what I am doing wrong?
import UIKit
import WebKit
class ViewController: UIViewController {
#IBOutlet weak var LoadingView: UIImageView!
var webView: WKWebView?
var bgImage: UIImageView?
var imageViewObject :UIImageView?
override func viewDidLoad() {
super.viewDidLoad()
//var imageViewObject :UIImageView
let screenSize: CGRect = UIScreen.main.bounds
imageViewObject = UIImageView(frame:CGRect(x:0,y: 0, width: screenSize.width, height: screenSize.height))
imageViewObject?.image = UIImage(named:"back_image")
webView?.navigationDelegate = self as? WKNavigationDelegate
self.view.addSubview(imageViewObject!)
let myURL = URL(string: "https://www.google.com")
let myRequest = URLRequest(url: myURL!)
_ = webView?.load(myRequest)
}
override func loadView() {
super.loadView()
//self.view.sendSubview(toBack: imageViewObject)
//self.view = self.LoadingView
self.webView = WKWebView()
self.view = self.webView
}
#IBAction func BackButton(_ sender: Any) {
if(webView?.canGoBack)!
{
webView?.goBack();
}
}
func webView(_ webView: WKWebView, didFinish navigation: WKNavigation!) {
print("TEST")
imageViewObject?.removeFromSuperview()
}
func webViewDidFinishLoad(webView: WKWebView) {
imageViewObject?.removeFromSuperview()
self.view = self.webView
}
override func didReceiveMemoryWarning() {
super.didReceiveMemoryWarning()
// Dispose of any resources that can be recreated.
}
}
you have to conform to it's protocol delegate by putting this line of code in viewDidLoad
webView?.uiDelegate = self
after doing that , now if you want to use delegation method's you have to put your viewController as a subclass of UIWebViewDelegate
class ViewController: UIViewController ,UIWebViewDelegate{
I fixed this by making
webView?.navigationDelegate = self
and adding this to the Class
class ViewController: UIViewController, WKNavigationDelegate
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 currently have my app linking to a certain URL upon opening the app, and this obviously can have a delay between opening it and the webView actually loading, so I want it to display an activity indicator whenever the webView is loading, I have the following code in my ViewController.swift:
class ViewController: UIViewController, UIWebViewDelegate {
#IBOutlet weak var webView: UIWebView!
#IBOutlet weak var activityIndicator: UIActivityIndicatorView!
override func viewDidLoad() {
super.viewDidLoad()
webView.delegate = self
let url = URL(string: "url to site")
webView.loadRequest(URLRequest(url: url!)
}
func webViewDidStartLoad(webView: UIWebView){
activityIndicator.startAnimating()
}
func webViewDidFinishLoad(webView: UIWebView){
activityIndicator.stopAnimating()
}
The activity indicator shows up from the beginning but it does not disappear once the webView loads and stays their forever.
The way you have your code organized is a bit confusing. It appears you are declaring your funcs inside the #IBAction function. If this is the case, this will not work.
Try this instead
class ViewController: UIViewController, UIWebviewDelegate {
override func viewDidLoad() {
...
webView.delegate = self
// You should add this to your Storyboard, above the webview instead of here in the code
activityIndicator.center = self.view.center
activityIndicator.hidesWhenStopped = true
activityIndicator.activityIndicatorViewStyle = UIActivityIndicatorViewStyle.gray
// I forget the actual method name - look it up
view.insertSubview(activityIndicator, above: webView)
}
#IBAction func openButton(_ sender: Any) {
let url = URL(string: "websiteURL")
webView.loadRequest(URLRequest(url: url!))
}
func webViewDidStartLoad(webView: UIWebView){
activityIndicator.startAnimating()
}
func webViewDidFinishLoad(webView: UIWebView){
activityIndicator.stopAnimating()
}
// You'll also want to add the "didFail" method
}
The issue is a syntax issue, you have to add an underscore in the functions.
override func viewDidLoad() {
super.viewDidLoad()
webView.delegate = self
let url = URL(string: "your URL")
webView.loadRequest(URLRequest(url: url!))
}
func webView(_ webView: UIWebView, shouldStartLoadWith request: URLRequest, navigationType: UIWebViewNavigationType) -> Bool{
activityIndicator.startAnimating()
return true
}
func webViewDidStartLoad(_ webView: UIWebView){
activityIndicator.startAnimating()
}
func webViewDidFinishLoad(_ webView: UIWebView){
activityIndicator.stopAnimating()
}
func webView(_ webView: UIWebView, didFailLoadWithError error: Error){
activityIndicator.stopAnimating()
}
I have an app that has two ViewControllers. On the first there is a count of current speed in realtime through CLLocationManager. Also there is a label that shows current speed with update by timer (NSTimer). In second ViewController there is another Label, where this current speed has to be shown too. It shows it, but don't update. I tried to set second timer (different ways: in first VC, in second VC - there is always was an error or just nothing).
Will be grateful for help, thanks!
First VC
import UIKit
import MapKit
import CoreLocation
class ViewController: UIViewController, CLLocationManagerDelegate {
#IBOutlet weak var mapView: MKMapView!
#IBOutlet weak var currentSpeedLabel: UILabel!
var manager = CLLocationManager()
var currentSpeed: CLLocationSpeed = CLLocationSpeed()
var timer = NSTimer()
override func viewDidLoad() {
super.viewDidLoad()
mapView.mapType = MKMapType.Hybrid
trackingMe()
}
override func didReceiveMemoryWarning() {
super.didReceiveMemoryWarning()
}
#IBAction func HUDMapView(sender: AnyObject) {
speedCount()
}
#IBAction func findMe(sender: AnyObject) {
trackingMe()
}
func locationManager(manager: CLLocationManager, didUpdateLocations locations: [CLLocation]) {
let userLocation: CLLocation = locations[0] as CLLocation
manager.stopUpdatingLocation()
let location = CLLocationCoordinate2D(latitude: userLocation.coordinate.latitude, longitude: userLocation.coordinate.longitude)
let span = MKCoordinateSpanMake(0.05, 0.05)
let region = MKCoordinateRegion(center: location, span: span)
mapView.setRegion(region, animated: true)
}
func trackingMe() {
manager.delegate = self
manager.desiredAccuracy = kCLLocationAccuracyBest
manager.requestWhenInUseAuthorization()
manager.startUpdatingLocation()
mapView.showsUserLocation = true
currentSpeedUpdate()
}
func currentSpeedUpdate() {
timer = NSTimer.scheduledTimerWithTimeInterval(0.5, target: self, selector: Selector("speedCount"), userInfo: nil, repeats: true)
}
func speedCount() {
currentSpeed = manager.location!.speed
currentSpeedLabel.text = String(format: "%.0f km/h", currentSpeed * 3.6)
}
override func prepareForSegue(segue: (UIStoryboardSegue!), sender: AnyObject!) {
let speedController = segue.destinationViewController as! speedViewController
currentSpeed = manager.location!.speed
speedController.showSpeed = currentSpeedLabel.text
}
}
Second VC
import UIKit
class speedViewController: UIViewController {
#IBOutlet weak var secondSpeedLabel: UILabel!
var showSpeed: String!
override func viewDidLoad() {
super.viewDidLoad()
// Do any additional setup after loading the view.
secondSpeedLabel.text = showSpeed
}
override func didReceiveMemoryWarning() {
super.didReceiveMemoryWarning()
// Dispose of any resources that can be recreated.
}
#IBAction func back(sender: AnyObject) {
self.dismissViewControllerAnimated(true, completion: nil)
}
}
Project Link
You could use a Singleton to hold the LocationManager. Then you can access it from all over your app. When you move to a second VC you can either change the delegate to the second VC or just get the needed data manually.
Remember that a delegate can only point to one "receiver". Changing the delegate will stop updates in the first VC. but since it is now a Singleton you can also store information in there about past locations / speeds. When dismissing the second VC get the stored data and update.
This will keep running until you call stop()
The code was simplified a bit to illustrate the idea.
VC Code:
import UIKit
import CoreLocation
class ViewController: UIViewController, TrackerDelegate {
override func viewDidLoad() {
super.viewDidLoad()
Tracker.shared.delegate = self
Tracker.shared.start()
}
func speedUpdate(speed: CLLocationSpeed) {
print(speed)
}
}
Singleton Code:
import UIKit
import MapKit
import CoreLocation
class Tracker: NSObject, CLLocationManagerDelegate {
static var shared = Tracker()
private var manager = CLLocationManager()
private var timer = NSTimer()
var region : MKCoordinateRegion?
var currentSpeed: CLLocationSpeed = CLLocationSpeed()
weak var delegate : TrackerDelegate?
private override init() {
super.init()
manager.delegate = self
manager.requestWhenInUseAuthorization()
}
internal func locationManager(manager: CLLocationManager, didUpdateLocations locations: [CLLocation]) {
manager.stopUpdatingLocation()
let userLocation: CLLocation = locations[0] as CLLocation
let coordinates2D = CLLocationCoordinate2D(latitude: userLocation.coordinate.latitude, longitude: userLocation.coordinate.longitude)
let span = MKCoordinateSpanMake(0.05, 0.05)
region = MKCoordinateRegion(center: coordinates2D, span: span)
currentSpeed = userLocation.speed
guard let del = delegate else {
return
}
del.speedUpdate(currentSpeed)
}
func start() {
manager.desiredAccuracy = kCLLocationAccuracyBest
manager.startUpdatingLocation()
timer = NSTimer.scheduledTimerWithTimeInterval(0.5, target: self, selector: Selector("loopUpdate"), userInfo: nil, repeats: true)
}
func stop() {
timer.invalidate()
}
internal func loopUpdate() {
// restart updating
manager.startUpdatingLocation()
}
}
Delegate for the Singleton:
Add more functions, or more values to the current function to get more feedback.
protocol TrackerDelegate : class {
func speedUpdate(speed:CLLocationSpeed)
}
Not sure why this isn't working? any help would be greatly appreciated. Thnks.
import UIKit
import MapKit
import CoreLocation
class ViewController: UIViewController, MKMapViewDelegate, CLLocationManagerDelegate {
var locationManager:CLLocationManager!
#IBOutlet weak var mapView: MKMapView!
#IBAction func nowButton(sender: AnyObject) {
}
#IBOutlet weak var mapLabel: UILabel!
#IBAction func bookButton(sender: AnyObject) {
}
override func viewDidLoad() {
super.viewDidLoad()
locationManager = CLLocationManager()
locationManager.requestAlwaysAuthorization()
locationManager.desiredAccuracy = kCLLocationAccuracyBest
locationManager.delegate = self
locationManager.startUpdatingLocation()
mapView.showsUserLocation = true
mapView.delegate = self
// 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.
}
func locationManager(manager: CLLocationManager!, didUpdateLocations locations: [AnyObject]!) {
let regionToZoom = MKCoordinateRegionMake(manager.location.coordinate, MKCoordinateSpanMake(0.05, 0.05))
mapView.setRegion(regionToZoom, animated: true)
}
}
Possible error cause lies in because of this line in didUpdateLocations delegate method:
let regionToZoom = MKCoordinateRegionMake(manager.location.coordinate, MKCoordinateSpanMake(0.05, 0.05))
You need to create region like below line (replace this line with above line):
let regionToZoom = MKCoordinateRegion(center: manager.location.coordinate, span: MKCoordinateSpanMake(0.05, 0.05)));
I have a question about swift,
I made a popover controller in a UIViewController,which display a list of books
and when the user click on one of the books, the label on the viewController should be updated with the name of the selected book.
But in my case when I select a name of a book, the label does not update
here is the code :
// View Controller
import UIKit
class ViewController: UIViewController,UIPopoverControllerDelegate {
var popoverController : UIPopoverController? = nil
#IBOutlet var bookName : UILabel
var BookNameString : String?{
didSet{
configureView()
}
}
func configureView() {
// Update the user interface for the detail item.
if let detail = self.BookNameString {
if let label = bookName {
label.text = detail
}
}
}
override func viewDidLoad() {
super.viewDidLoad()
// Do any additional setup after loading the view, typically from a nib.
}
#IBAction func Click(sender : UIButton) {
var tableView:TableViewController = TableViewController(style: UITableViewStyle.Plain)
var popoverContent:UINavigationController = UINavigationController(rootViewController: tableView)
self.popoverController = UIPopoverController(contentViewController: popoverContent)
self.popoverController!.delegate = self
self.popoverController!.presentPopoverFromRect(sender.frame, inView: self.view, permittedArrowDirections: UIPopoverArrowDirection.Any, animated: true)
}
override func didReceiveMemoryWarning() {
super.didReceiveMemoryWarning()
// Dispose of any resources that can be recreated.
}
}
and here is the code of the TableViewController when a row is selected:
// TableViewController
override func tableView(tableView: UITableView!, didSelectRowAtIndexPath indexPath: NSIndexPath!){
var storyboard = UIStoryboard(name: "Main", bundle: nil)
var details = storyboard.instantiateViewControllerWithIdentifier("ViewController") as ViewController
var keyString = bookSectionKeys[indexPath.section]
var bookValues = book.booksLetters[keyString]!
var selectedBookString = bookValues[indexPath.row]
var selectedBookValues = book.bookDictionary[selectedBookString]!
details.BookNameString = selectedBookString
}
I was able to solve this problem a few weeks ago and I want to share the solution with you :)
I solve it using protocols.
OK Here what I did in details:
First I created a protocol in the view that I want it to display inside the popover and I named the protocol "DismissPopoverDelegate"
protocol DismissPopoverDelegate{
func didSelectBook(SelectedBook:String)
}
Then I declared a variable of type DismissPopoverDelegate and name it "delegate"
var delegate: DismissPopoverDelegate?
Then in the didSelectRowAtIndexMethod:
override func tableView(tableView: UITableView!, didSelectRowAtIndexPath indexPath: NSIndexPath!){
var keyString = bookSectionKeys[indexPath.section]
var bookValues = book.booksLetters[keyString]!
var selectedBookString = bookValues[indexPath.row]
delegate?.didSelectBook(selectedBookString)
}
After that inside the View that contains the popover (View Controller), I set the delegate of the view:
class ViewController: UIViewController, DismissPopOverDelegate, UIPopoverControllerDelegate{
Then to make the view confirm to the protocol DismissPopOverDelegate, I implement the method "didSelectBook" Inside the view:
func didSelectBook(SelectedBook:String){
popoverController!.dismissPopoverAnimated(true) // This is Optional
bookName.text = SelectedBook // Make the label text equal to the selected book From the table
}
Finally, I set the delegate to the tableView to View Controller
tableView.delegate = self
That's it :)
Here is the full code of the viewController that contains the popover
import UIKit
class ViewController: UIViewController, DismissPopOverDelegate, UIPopoverControllerDelegate{
#IBOutlet var booksbarButton : UIBarButtonItem
#IBOutlet var bookName : UILabel
var popoverController : UIPopoverController? = nil
override func viewDidLoad() {
super.viewDidLoad()
}
override func didReceiveMemoryWarning() {
super.didReceiveMemoryWarning()
}
#IBAction func showTableView(sender : UIBarButtonItem) {
var tableView:TableViewController = TableViewController(style: UITableViewStyle.Plain)
tableView.delegate = self
var popoverContent:UINavigationController = UINavigationController(rootViewController: tableView)
self.popoverController = UIPopoverController(contentViewController: popoverContent)
popoverController!.delegate = self
self.popoverController!.presentPopoverFromBarButtonItem(booksbarButton, permittedArrowDirections: UIPopoverArrowDirection.Any, animated: true)
}
func didSelectBook(SelectedBook:String){
popoverController!.dismissPopoverAnimated(true)
bookName.text = SelectedBook
}
}