I get an error when I press a button on the sideBar stopping here:
webView.scalesPageToFit = true
webView.loadRequest(request)
I would like to ask help to solve the problem.
Below is my code of ViewController.swift
import UIKit
class ViewController: UIViewController, UISearchBarDelegate {
#IBOutlet weak var searchBar: UISearchBar!
#IBOutlet weak var webView: UIWebView!
override func viewDidLoad() {
super.viewDidLoad()
let url = NSURL(string: "http://www.apple.com")
let request = NSURLRequest(URL: url!)
webView.scalesPageToFit = true
webView.loadRequest(request)
}
func searchBarSearchButtonClicked(searchBar: UISearchBar! {
caricaUrl(searchBar.text)
}
func caricaUrl(url: String) {
let url = NSURL(string: "http://www.google.com/search?q=" + "\(url)")
let request = NSURLRequest(URL: url!)
webView.scalesPageToFit = true
webView.loadRequest(request)
}
func didReceiveMemoryWaarning() {
super.didReceiveMemoryWarning()
}
#IBAction func onBurger() {
(tabBarController as TabBarController).sidebar.showInViewController(self, animated: true)
}
}
Your web view is an optional value, so you either have to force unwrap it or say that it is an optional when calling it. Your app was trying to force unwrap it, and it came back with nil. That means you can't force unwrap the variable.
So you can change both of these lines in both places they are declared:
webView.scalesPageToFit = true
webView.loadRequest(request)
to these lines:
webView?.scalesPageToFit = true
webView?.loadRequest(request)
The question mark explicitly says that the webView variable is an optional.
Related
What am I doing wrong?
I get this error:
let letterString = sender.title(for: .normal)! // Thread 1: Fatal error: Unexpectedly found nil while unwrapping an Optional value
when I tried to get the title of a button in swift like below:
import UIKit
class ViewController: UIViewController {
// My IBOutlets
#IBOutlet var treeImageView: UIImageView!
#IBOutlet var correctWordLabel: UILabel!
#IBOutlet var scoreLabel: UILabel!
// My Outlet Collection
#IBOutlet var letterButtons: [UIButton]!
override func viewDidLoad() {
super.viewDidLoad()
// Do any additional setup after loading the view.
// Begin the round.
newRound()
}
var listOfWords = ["estufa", "nevera", "computadora", "empanada", "chuleta", "camarones", "brincar", "correr", "caminar", "tigre", "jirafa", "mono", "kisseemmee", "Tampa", "Orlando"]
let incorrectMovesAllowed = 7
let totalWins = 0
let totalLosses = 0
// My IBActions
#IBAction func letterButtonPressed(_ sender: UIButton) {
sender.isEnabled = false
let letterString = sender.title(for: .normal)! // Thread 1: Fatal error: Unexpectedly found nil while unwrapping an Optional value
let letter = Character(letterString.lowercased())
currentGame.playerGuessed(letter: letter)
updateUI()
}
var currentGame: Game!
func newRound() {
let newWord = listOfWords.removeFirst()
currentGame = Game(word: newWord, incorrectMovesRemaining: incorrectMovesAllowed, guessedLetters: [])
updateUI()
}
func updateUI() {
scoreLabel.text = "Wins: \(totalWins), Losses: \(totalLosses)"
treeImageView.image = UIImage(named: "Tree \(currentGame.incorrectMovesRemaining)")
}
}
// Game.swift file code:
import Foundation
struct Game {
var word: String
var incorrectMovesRemaining: Int
var guessedLetters: [Character]
mutating func playerGuessed(letter: Character) {
guessedLetters.append(letter)
if !word.contains(letter) {
incorrectMovesRemaining -= 1
}
}
}
I'm a newbie. This is my first program. I appreciate if you code the solution.
You can get the title of the UIButton using titleLabel property. Check the below code.
sender.titleLabel?.text
As the above code returns optional, you can use optional chain to safely get the string
if let titleLabel = sender.titleLabel {
let title = titleLabel.text
}
OR
You can also use the currentTitle property as below.
sender.currentTitle
You can use:
sender.titleLabel.text
started learning swift two weeks ago, with no previous programming experience, and I can't for the life of me figure out why this wouldn't work to check for nil. it just crashes when trying to load a web page if the user enters an invalid URL. This is the ENTIRETY of the code.
import UIKit; import WebKit
class ViewController: UIViewController {
#IBOutlet weak var adressBar: UITextField!
#IBOutlet weak var webView: WKWebView!
override func viewDidLoad() {
super.viewDidLoad()
}
override func didReceiveMemoryWarning() {
super.didReceiveMemoryWarning()
}
#IBAction func returnPressed(_ sender: Any) {
if let adressBarText = adressBar.text {
if let myURL = URL(string: adressBarText) {
let myRequest = URLRequest(url: myURL)
webView.load(myRequest)
adressBar.resignFirstResponder()
print("EYYYYY")
} else {
print("BOOOO")
}
}
}
}
Try this method
func verifyUrl (urlString: String?) -> Bool {
//Check for nil
if let urlString = urlString {
// create NSURL instance
if let url = NSURL(string: urlString) {
// check if your application can open the NSURL instance
return UIApplication.sharedApplication().canOpenURL(url)
}
}
return false
}
https://stackoverflow.com/a/30130535/8069241
I have a master/detail app, where I need to get the image from the master and put it in the detail
It's complaining on the imageView line although I have a file called Gerbera.png image but it won't show. Also how do I call the image from the master to the detail page?
class DetailViewController: UIViewController {
#IBOutlet weak var webView: UIWebView!
#IBOutlet weak var detailDescriptionLabel: UILabel!
#IBOutlet weak var imageView: UIImageView!
#IBOutlet weak var btnCall: UIButton!
func configureView() {
// Update the user interface for the detail item.
if let detail: AnyObject = detailItem {
if let myWebview = webView {
let stringRepresentation = MasterViewController.MyVariables.urlString?.joined(separator:"")
print ("urlString", MasterViewController.MyVariables.urlString)
print ("sR",stringRepresentation)
let url = NSURL(string: stringRepresentation as! String)
let request = URLRequest(url: url! as URL)
myWebview.scalesPageToFit = true
myWebview.loadRequest(request)
}
imageView.image = UIImage(named:"Gerbera.png")!
}
}
Please try this line
imageView.image = UIImage(named:"Gerbera")!
I found the answer for this. My Detail View shows image on the top then web view on the bottom. I realized that the detail view should show code for the image first before code for the web view. So I put it under viewDidLoad() and it worked!
override func viewDidLoad() {
super.viewDidLoad()
imageView1.image = MasterViewController.MyVariables.flowerImage!.first
Suppose I have a label that is a NSTextField. I know I can access the value of that label by:
#IBOutlet weak var label: NSTextField!
let labelValue = label.stringValue
And then I can use that variable accordingly.
The same is easily said for an NSImage:
#IBOutlet weak var productImageView: NSImageView!
let img = productImageView.image
My question is how do I grab the value of a WebView. I am unsure which property allows me to use a WebView.
#IBOutlet weak var videoTemp: WebView!
let videoPassed = videoTemp //how do I access this videoTemp's value much like .stringValue and .image
I am trying to load dynamic video URL's to Youtube videos when I click on a collection view item. The line that I have commented in my setupAppVideo method is where my fatal error occurs:
"fatal error: unexpectedly found nil while unwrapping an Optional value"
but when I print out the url and request variables their are no nil values and all of them are the correct links in the console.
import Cocoa
import WebKit
class test1: NSCollectionViewItem {
#IBOutlet weak var label: NSTextField!
#IBOutlet weak var label2: NSTextField!
#IBOutlet weak var productImageView: NSImageView!
#IBOutlet weak var videoTemp: WKWebView!
var buildProduct: ProductModel? {
didSet{
label.stringValue = (buildProduct?.product_name)!
label2.stringValue = (buildProduct?.product_price)!
setupAppIconImage()
setupAppVideo()
}
}
override func viewDidLoad() {
super.viewDidLoad()
}
func setupAppIconImage() {
if let appIconImageURL = buildProduct?.product_image {
let url = NSURL(string: appIconImageURL)
URLSession.shared.dataTask(with: url! as URL,completionHandler:{(data, response, error) in
if error != nil {
print(error)
return
}
DispatchQueue.main.async(){
self.productImageView.image = NSImage(data: data!)
}
}).resume()
}
}
func setupAppVideo(){
if let appVideoURL = buildProduct?.product_video{
let url = NSURL(string: appVideoURL)
print(url)
let request = NSURLRequest(url: url as! URL)
print(request)
//self.videoTemp.load(request as URLRequest)
}
}
}
I created a view to use as background and I would like to change its color when label text is greater or less than variable number. The script is okay but the color is not changing.
Thanks in advance.
import UIKit
class ViewController: UIViewController, UITextFieldDelegate {
#IBOutlet weak var localName: UITextField!
#IBOutlet weak var localNameLabel: UILabel!
#IBOutlet weak var localTemp: UILabel!
#IBAction func getData(sender: AnyObject) {
getWeatherData("http://api.openweathermap.org/data/2.5/weather?q=" + localName.text! + "")
}
#IBOutlet weak var fundo: UIView!
override func viewDidLoad() {
super.viewDidLoad()
getWeatherData("http://api.openweathermap.org/data/2.5/weather?q=London")
// 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 getWeatherData(urlString: String){
let url = NSURL (string: urlString)
let task = NSURLSession.sharedSession().dataTaskWithURL(url!) { (data, response, error) in
dispatch_async(dispatch_get_main_queue(), {
self.setLabels(data!)
})
}
task.resume()
}
func setLabels(weatherData: NSData) {
do {
let json = try NSJSONSerialization.JSONObjectWithData(weatherData, options:NSJSONReadingOptions.MutableContainers) as! NSDictionary
print(json)
//localNameLabel.text = json[("name")] as? String
if let name = json[("name")] as? String {
localNameLabel.text = name
}
if let main = json[("main")] as? NSDictionary {
if let temp = main[("temp")] as? Double {
//convert kelvin to celsius
let ft = (temp - 273.15)
let myString = ft.description
localTemp.text = myString
self.changeColor()
}
}
} catch let error as NSError {
print(error)
}
var number : Float
func changeColor(){
number = 19.0
if(Float(localTemp.text!) < number){
fundo.backgroundColor = .blueColor()
}else{
fundo.backgroundColor = .orangeColor()
}
}
}
}
Edited to post the entire script
In your view controller you need to add UITextFieldDelegate which will allow you to access methods related to your text field. The top of your view controller should look like this:
class ViewController: UIViewController,UITextFieldDelegate //set delegate to class
You then need to set the delegate of your text field to self in viewDidLoad and add a target for when the text field changes:
override func viewDidLoad() {
super.viewDidLoad()
localTemp.delegate = self //set delegate to this vc
localTemp.addTarget(self, action: "textFieldDidChange:", forControlEvents: UIControlEvents.EditingChanged)
}
You can then implement this method which will run on every key press and you need to call your changeColor() method as above:
func textFieldDidChange(textField: UITextField) {
self.changeColor()
}