This code doesn't work.
import Cocoa
class ViewController: NSViewController {
#IBOutlet weak var textField: NSTextField!
var guessScore : Int
override func viewDidLoad() {
super.viewDidLoad()
}
override init(){
super.init()
guessScore = 1
}
before calling super.init(), all your properties must be initialized (they have to have some 'default' value), Please read apple docs.
override init(){
guessScore = 1
super.init()
}
Your code produces:
So you may want to simply follow the instructions given by Xcode and override the designated initializer:
var guessScore: Int
override init?(nibName nibNameOrNil: String?, bundle nibBundleOrNil: NSBundle?) {
guessScore = 1
super.init(nibName: nibNameOrNil, bundle: nibBundleOrNil)
}
required init?(coder: NSCoder) {
guessScore = 1
super.init(coder: coder)
}
Or directly without any initializer, provide a default value:
var guessScore: Int = 1
Related
I'm new to Swift, and trying my hands with UIWebView app that loads default url, with option to perform quick action and load a different url.
Problem is when I request the quick action url, code executes but the new url is not loading. So I'm missing something in the flow somewhere.
Here is the code:
import UIKit
import WebKit
class ViewController: UIViewController, UIWebViewDelegate {
#IBOutlet var webView: UIWebView!
override func loadView() {
super.loadView()
self.webView = UIWebView()
self.view = self.webView!
}
override func viewDidLoad() {
print("view did load")
super.viewDidLoad()
let url = NSURL(string: "google.com")
let req = NSURLRequest(URL:url!)
webView.loadRequest(req)
webView.delegate = self
}
func loadUrl2() {
loadView()
let url = NSURL(string: "example.com")
print(url)
let req = NSURLRequest(URL:url!)
self.webView!.loadRequest(req)
}
override func didReceiveMemoryWarning() {
super.didReceiveMemoryWarning()
// Dispose of any resources that can be recreated.
}
}
I was experimenting and added loadView to loadUrl2, as I was getting
fatal error: unexpectedly found nil while unwrapping an Optional value
before that.
Edited to Include loading secondary link:
Here are the changes and files you'll need to make to the App Delegate
enum ShortcutIdentifier: String {
case OpenNewLink
case OpenBetterLink
init?(fullIdentifier: String) {
guard let shortIdentifier = fullIdentifier.componentsSeparatedByString(".").last else {
return nil
}
self.init(rawValue: shortIdentifier)
}
}
func application(application: UIApplication, didFinishLaunchingWithOptions launchOptions: [NSObject: AnyObject]?) -> Bool {
if let shortcutItem = launchOptions?[UIApplicationLaunchOptionsAnnotationKey] as? UIApplicationShortcutItem {
handleShortcut(shortcutItem)
return false
}
return true
}
func application(application: UIApplication, performActionForShortcutItem shortcutItem: UIApplicationShortcutItem, completionHandler: (Bool) -> Void) {
completionHandler(handleShortcut(shortcutItem))
}
private func handleShortcut(shortcutItem: UIApplicationShortcutItem) -> Bool {
let shortcutType = shortcutItem.type
guard let ShortcutIdentifier = ShortcutIdentifier(fullIdentifier: shortcutType) else {
return false
}
return selectLinkForIdentifier(ShortcutIdentifier)
}
private func selectLinkForIdentifier(identifier: ShortcutIdentifier) -> Bool {
guard let mainView = self.window?.rootViewController as? ViewController else {
return false
}
switch identifier {
case .OpenNewLink:
mainView.urlString = "http://www.bing.com"
mainView.loadWebView(mainView.urlString)
return true
case.OpenBetterLink:
mainView.urlString = "http://www.duckduckgo.com"
mainView.loadWebView(mainView.urlString)
return true
}
}
I also made changes in the MainVC
class ViewController: UIViewController, UIWebViewDelegate {
#IBOutlet var webView: UIWebView!
var urlString: String? = nil
override func viewDidLoad() {
super.viewDidLoad()
setUpWebView()
webView.delegate = self
view.addSubview(webView)
}
func setUpWebView() {
webView = UIWebView()
webView.frame = CGRectMake(0, 0, view.frame.width, view.frame.height)
loadWebView(urlString)
}
func loadWebView(var urlString: String?) {
if urlString == nil {
urlString = "http://www.google.com"
}
let url = NSURL(string: urlString!)
let req = NSURLRequest(URL:url!)
webView.loadRequest(req)
}
}
Be sure to add NSAppTransportSecurity dictionary to your .plist and add NSAllowsArbitraryLoads key set to YES.
I tested it and it should work for you.
I'd like to read data from an array and write data to a file and viceversa. The file itself has a known path.
The BTTableCell class manages and populates the tableView.
I'm using dati_Riga class in order to have a single array. I thought it would be easier to read and save data using WriteToFile in order to write data and NSMutableArray to read them, but I'm having trouble.
In the following code snippet of the ViewController file you can see functions I wrote in order to open and save data which don't work.
Where did I get wrong? My idea is to save data using BTTableCell but I wasn't able to make it work.
Data structure:
import Cocoa
class BPTableCell:NSTableCellView {
#IBOutlet weak var item_IconaFile: NSImageView!
#IBOutlet weak var item_NomeFile: NSTextField!
#IBOutlet weak var item_PathFile: NSTextField!
#IBOutlet weak var item_MD5: NSTextField!
#IBOutlet weak var item_SHA1: NSTextField!
}
class dati_Riga {
var dati_Riga_item_IconaFile: NSImage!
var dati_Riga_item_NomeFile: String!
var dati_Riga_item_PathFile: String!
var dati_Riga_item_MD5: String!
var dati_Riga_item_SHA1: String!
init (dati_Riga_item_IconaFile: NSImage, dati_Riga_item_NomeFile: String, dati_Riga_item_PathFile: String, dati_Riga_item_MD5: String, dati_Riga_item_SHA1: String)
{
self.dati_Riga_item_IconaFile = dati_Riga_item_IconaFile
self.dati_Riga_item_NomeFile = dati_Riga_item_NomeFile
self.dati_Riga_item_PathFile = dati_Riga_item_PathFile
self.dati_Riga_item_MD5 = dati_Riga_item_MD5
self.dati_Riga_item_SHA1 = dati_Riga_item_SHA1
}
}
Extract from "ViewController.swift":
import Cocoa
import Foundation
import AppKit
import CryptoSwift
class ViewController: NSViewController, NSTableViewDataSource, NSTableViewDelegate {
#IBOutlet weak var tableview: NSTableView!
var item_IconaFile = [NSImage]()
var item_NomeFile = [String]()
var item_PathFile = [String]()
var item_MD5 = [String]()
var item_SHA1 = [String]()
var miei_Dati_Riga : [dati_Riga] = [dati_Riga(dati_Riga_item_IconaFile: NSImage(), dati_Riga_item_NomeFile: "", dati_Riga_item_PathFile: "", dati_Riga_item_MD5: "", dati_Riga_item_SHA1: "")]
override func viewDidLoad() {
super.viewDidLoad()
self.miei_Dati_Riga.removeAtIndex(0)
}
override var representedObject: AnyObject? {
didSet {
// Update the view, if already loaded.
}
}
// MARK: Funzioni relative la TableView
func tableView(tableView: NSTableView, viewForTableColumn tableColumn: NSTableColumn?, row: Int) -> NSView? {
let result : BPTableCell = tableView.makeViewWithIdentifier(tableColumn!.identifier, owner: self) as! BPTableCell
result.item_IconaFile.image = item_IconaFile[row]
result.item_NomeFile.stringValue = item_NomeFile[row]
result.item_PathFile.stringValue = item_PathFile[row]
result.item_MD5.stringValue = item_MD5[row]
result.item_SHA1.stringValue = item_SHA1[row]
return result
}
func numberOfRowsInTableView(tableView: NSTableView) -> Int {
let num_Righe = item_NomeFile.count
return num_Righe
}
// MARK: Apri e Salva file
#IBAction func Save_File(sender: NSMenuItem) {
let salva_File = NSSavePanel()
salva_File.extensionHidden = true
salva_File.canSelectHiddenExtension = true
salva_File.allowedFileTypes = ["cpa"]
salva_File.beginWithCompletionHandler { (result:Int) -> Void in
if result == NSFileHandlingPanelOKButton {
let save_URL_File = salva_File.URL
let mio_Array: NSArray = self.miei_Dati_Riga
print(self.miei_Dati_Riga.count)
print(self.miei_Dati_Riga[0])
if mio_Array.writeToFile((save_URL_File?.path)!, atomically: true) {
print("File Salvato")}
else {
print("File Non Salvato")
}
}
}
}
#IBAction func Open_File(sender: NSMenuItem) {
let apri_File = NSOpenPanel()
apri_File.allowedFileTypes = ["cpa"]
apri_File.beginWithCompletionHandler { (result:Int) -> Void in
if result == NSFileHandlingPanelOKButton {
let contenuto_File = NSMutableArray (contentsOfURL: apri_File.URL!)
self.tableview.reloadData()
}
}
}
I am learning Swift and I have a compile error:
class ListScansVC: UIViewController {
#IBOutlet weak var tableView: UITableView!
internal var scans: [Scan]
internal var dataSource: ListScanDataSource
init(scans: [Scan]){
self.scans = scans
dataSource = ListScanDataSource.init(scans: scans)
super.init(nibName: nil, bundle: nil)
}
required init?(coder aDecoder: NSCoder) {
fatalError("init(coder:) has not been implemented")
}
override func viewDidLoad() {
super.viewDidLoad()
dataSource.registerReusableViewsForTableView(tableView)
}
}
In another ViewController i am doing:
override func viewDidLoad() {
super.viewDidLoad()
let scan = Scan(title : "Ticket", scanDate: NSDate())
let listScanVC = ListScansVC.init(scans: [scan])
self.displayChildContent(ListScansVC)
}
func displayChildContent(content : UIViewController){
self.addChildViewController(content)
self.view.addSubview(content.view)
content.didMoveToParentViewController(self)
}
The error is:
"Cannot convert value of Type 'ListScansVC.Type' to expected argument type 'UIViewController'"
An init method in Swift like
init(scans :[Scan]){)
has be be called with
let listScanVC = ListScansVC(scans: [scan])
in the next line you have to pass the instance (starting with a lowercase letter) rather than the type
self.displayChildContent(listScanVC)
I'd recommended to use more distinctive names to avoid that type/instance confusion.
I'm trying to setup a sign in page using parse and swift in Xcode but I keep getting an error with 'signInBackgroundWithBlock' how do I make this work?
I keep receiving the message
Cannot invoke 'signUpInBackgroundWithBlock' with an argument list of
type ((Bool!, NSError!) -> Void)
so far this is what I have and I just have an error with that part.
import UIKit
import Parse
class EmailLogin: UIViewController, UITextFieldDelegate {
#IBOutlet weak var emailTextField: UITextField!
#IBOutlet weak var statusLabel: UILabel!
#IBOutlet weak var createAccountButton: UIButton!
#IBOutlet weak var passwordTextField: UITextField!
override func viewDidLoad()
{
super.viewDidLoad()
// Do any additional setup after loading the view, typically from a nib.
emailTextField.delegate = self;
passwordTextField.delegate = self;
}
override func didReceiveMemoryWarning()
{
super.didReceiveMemoryWarning()
// Dispose of any resources that can be recreated.
}
#IBAction func createAccountButtonPressed(sender: AnyObject)
{
if verifyEmailDomain(self.emailTextField.text)
{
createAccount(self.emailTextField.text, password: self.passwordTextField.text)
}
else
{
//self.statusLabel.text = "Email domain is not valid.";
let alert = UIAlertView()
alert.title = "Invalid Email Domain"
alert.message = "Make sure you entered in your address correctly. If you did, ask your system about using PageMD! Thanks."
alert.addButtonWithTitle("Close")
alert.show()
}
}
func verifyEmailDomain(email: String) -> Bool
{
var isVerifiedDomain = false
let userDomain: String = (email.componentsSeparatedByString("#")).last!
//NSLog(userDomain)
let validDomainsFileLocation = NSBundle.mainBundle().pathForResource("ValidDomains", ofType: "txt")
var validDomainsFileContent = NSString(contentsOfFile: validDomainsFileLocation!, encoding: NSUTF8StringEncoding, error: nil)
//NSLog(validDomainsFileContent!)
let validDomains = validDomainsFileContent!.componentsSeparatedByString("\n")
for domain in validDomains
{
NSLog(domain as! NSString as String)
if userDomain == (domain as! NSString)
{
isVerifiedDomain = true
break
}
}
return isVerifiedDomain
}
func createAccount(email: String, password: String)
{
var newUser = PFUser()
newUser.username = email // We want the user to login only with their email.
newUser.email = email
newUser.password = password
//this where i get my error//
newUser.signUpInBackgroundWithBlock { (succeeded: Bool!, error: NSError!) -> Void in
if error == nil
{
// Account created successfully!
if succeeded == true
{
self.statusLabel.text = "Account created!"
}
}
else
{
if let errorField = error.userInfo
{
self.statusLabel.text = (errorField["error"] as NSString)
}
else
{
// No userInfo dictionary present
// Help from http://stackoverflow.com/questions/25381338/nsobject-anyobject-does-not-have-a-member-named-subscript-error-in-xcode
}
}
}
}
func textFieldShouldReturn(textField: UITextField) -> Bool
{
textField.resignFirstResponder()
return true;
}
}
/*
// MARK: - Navigation
// In a storyboard-based application, you will often want to do a little preparation before navigation
override func prepareForSegue(segue: UIStoryboardSegue, sender: AnyObject?) {
// Get the new view controller using segue.destinationViewController.
// Pass the selected object to the new view controller.
}
*/
If you are using swift 1.2 (Xcode 6.3) you need to call the function by:
newUser.signUpInBackgroundWithBlock({(succeeded:Bool, error:NSError?) -> Void in
})
And if you are using swift 1.1 (Xcode 6.1, 6.2) you need to call the function by:
newUser.signUpInBackgroundWithBlock({(succeded:Bool, error:NSError!) -> Void in
})
This is different because of the swift update 1.2 which has changes with using optionals.
Another way is to write it like this:
(Works in old and new swift)
newuser.signUpInBackgroundWithBlock { (succeded, error) -> Void in
}
Say I have a class like this one:
class UniverseViewController: UITableViewController {
var model = createModel()
// blah, blah...
}
When exactly will the createModel function be called? Before the init? After it?
It is called before init and viewDidLoad etc.
The following code:
struct testStruct {
init() {
println("testStruct")
}
}
let tempValue = testStruct()
required init(coder aDecoder: NSCoder) {
super.init(coder: aDecoder)
println("Coder")
}
override func viewDidLoad() {
super.viewDidLoad()
println("viewDidLoad")
}
will give us the following output:
testStruct
Coder
viewDidLoad