Trying to figure out errors after updating to Xcode 6.3. I have a class thats getting the error 'Class has no initializers' could anyone tell me how to fix this?
class TodayViewController: UIViewController, UITableViewDataSource, UITableViewDelegate, BWWalkthroughViewControllerDelegate {
var events: [EKEvent] = []
let eventStore = EKEventStore()
var pttCalendar: EKCalendar?
let walkthroughVC : BWWalkthroughViewController?
#IBOutlet weak var tableView: UITableView!
var dateFormatter = NSDateFormatter()
override func viewDidLoad() {
super.viewDidLoad()
requestCalendarAccess()
let firstLaunch = NSUserDefaults.standardUserDefaults().boolForKey("FirstLaunch")
if firstLaunch {
println("Not first launch.")
}
else {
showWalkthrough()
println("First launch, setting NSUserDefault.")
NSUserDefaults.standardUserDefaults().setBool(true, forKey: "FirstLaunch")
}
self.tableView.rowHeight = 50
dateFormatter.dateFormat = "EE, MMM dd"
let dateForLabel = dateFormatter.stringFromDate(NSDate())
self.title = dateForLabel
}
You forgot the override func init()
You need an initialiser to set the value
let walkthroughVC : BWWalkthroughViewController?
Setting that as a var will remove the error. It will of course default to nil.
Related
I am newbie to programming. With CoreData, I am trying to create the function to edit the data in input text field to edit the data to be saved to core data. I am having fatal error:
unexpectedly found nil while unwrapping an Optional value
#IBAction func update(sender: AnyObject) {
let appDelegate = UIApplication.sharedApplication().delegate as! AppDelegate
let manageContext = appDelegate.managedObjectContext
let fetchRequest = NSFetchRequest(entityName: "Coursework")
do {
let results = try manageContext.executeFetchRequest(fetchRequest)
let attribute = results[0] as! NSManagedObject
detailItem?.value = modulename.text
attribute.setValue(courseworkname.text, forkey: "courseworkname")
attribute.setValue(dueDateLabel.text, forkey: "duedate")
attribute.setValue(level.text, forkey: "level")
attribute.setValue(mark.text, forkey: "mark")
attribute.setValue(modulename.text, forkey: "modulename")
attribute.setValue(notes.text, forkey: "notes")
attribute.setValue(progressbar.text, forkey: "progressbar")
attribute.setValue(reminder.text, forkey: "reminder")
attribute.setValue(value.text, forkey: "value")
try manageContext.save()
}catch let error as NSError {
}
}
Full code:
#IBOutlet weak var detailDescriptionLabel: UILabel!
#IBOutlet weak var dueDateLabel: UITextField!
#IBOutlet weak var value: UITextField!
#IBOutlet weak var courseworkname: UITextField!
#IBOutlet weak var modulename: UITextField!
#IBOutlet weak var level: UITextField!
#IBOutlet weak var mark: UITextField!
#IBOutlet weak var reminder: UITextField!
#IBOutlet weak var notes: UITextField!
#IBAction func edit(sender: AnyObject) {
modulename.userInteractionEnabled = true
modulename.enabled = true
dueDateLabel.userInteractionEnabled = true
value.userInteractionEnabled = true
modulename.userInteractionEnabled = true
level.userInteractionEnabled = true
mark.userInteractionEnabled = true
reminder.userInteractionEnabled = true
notes.userInteractionEnabled = true
//Interaction
value.enabled = true
dueDateLabel.enabled = true
courseworkname.enabled = true
modulename.enabled = true
level.enabled = true
mark.enabled = true
reminder.enabled = true
notes.enabled = true
}
#IBAction func update(sender: AnyObject) {
let appDelegate = UIApplication.sharedApplication().delegate as! AppDelegate
let manageContext = appDelegate.managedObjectContext
let fetchRequest = NSFetchRequest(entityName: "Coursework")
do {
let results = try manageContext.executeFetchRequest(fetchRequest)
let attribute = results[0] as! NSManagedObject
detailItem?.value = modulename.text
attribute.setValue(courseworkname.text, forKey: "courseworkname")
attribute.setValue(dueDateLabel.text, forKey: "duedate")
attribute.setValue(level.text, forKey: "level")
attribute.setValue(mark.text, forKey: "mark")
attribute.setValue(modulename.text, forKey: "modulename")
attribute.setValue(notes.text, forKey: "notes")
attribute.setValue(progressbar.text, forKey: "progressbar")
attribute.setValue(reminder.text, forKey: "reminder")
attribute.setValue(value.text, forKey: "value")
try manageContext.save()
}catch let error as NSError{
}
}
var detailItem: Coursework?
var detailItem2: Task?
{
didSet {
// Update the view.
self.configureView()
}
}
func configureView() {
// Update the user interface for the detail item.
if let detail = self.detailItem {
if let label = self.detailDescriptionLabel {
label.text = detail.courseworkname
}
if let label = self.dueDateLabel {
label.text = detail.duedate
}
if let label = self.value {
label.text = detail.value
}
if let label = self.courseworkname {
label.text = detail.courseworkname
}
if let label = self.modulename {
label.text = detail.modulename
}
if let label = self.level {
label.text = detail.level
}
if let label = self.mark {
label.text = detail.mark
}
if let label = self.reminder{
label.text = detail.reminder
}
if let label = self.notes{
label.text = detail.notes
}
}
Is it a new attribute? You have to uninstall and reinstall the app when you're changing your CoreData models.
Also just saw that you don't have an IBOutlet defined for progressbar, if you link it it should work.
I'm trying to observering collectionView.contentSize like this :
func startObserveCollectionView() {
collectionView.addObserver(self, forKeyPath: "contentSize", options: NSKeyValueObservingOptions.Old.union(NSKeyValueObservingOptions.New), context: &SearchDasboardLabelContext)
}
override func observeValueForKeyPath(keyPath: String?, ofObject object: AnyObject?, change: [String : AnyObject]?, context: UnsafeMutablePointer<Void>) {
if context == &SearchDasboardLabelContext {
if object === collectionView && keyPath! == "contentSize" {
print(change)
}
}
}
and in xcode terminal I got a NSSize not CGSize like this :
Optional(["old": NSSize: {320, 0}, "new": NSSize: {375, 39.5}, "kind": 1])
In objective-c I used method CGSizeValue
CGSize newContentSize = [[change objectForKey:NSKeyValueChangeNewKey] CGSizeValue];
Is there any method like CGSizeValue in swift
I have tried in swift var newContentSize = change[NSKeyValueChangeNewKey]?.CGSizeValue() but got error
could not find member 'CGSizeValue'
need help anyone? Thanks
With Swift 4, you can cast the result of the change dictionary for the key NSKeyValueChangeKey.newKey as being of type CGSize:
if let size = change?[NSKeyValueChangeKey.newKey] as? CGSize {
/* ... */
}
The following UIViewController implementation shows how to set a KVO stack in order to observe the changes of the contentSize property of any UIScrollView subclass (e.g UITextView):
import UIKit
private var myContext = 0
class ViewController: UIViewController {
#IBOutlet weak var textView: UITextView!
/* ... */
override func viewDidLoad() {
super.viewDidLoad()
textView.addObserver(self, forKeyPath: #keyPath(UITextView.contentSize), options: [NSKeyValueObservingOptions.new], context: &myContext)
}
override func observeValue(forKeyPath keyPath: String?, of object: Any?, change: [NSKeyValueChangeKey : Any]?, context: UnsafeMutableRawPointer?) {
if context == &myContext,
keyPath == #keyPath(UITextView.contentSize),
let contentSize = change?[NSKeyValueChangeKey.newKey] as? CGSize {
print("contentSize:", contentSize)
}
}
deinit {
textView.removeObserver(self, forKeyPath: #keyPath(UITextView.contentSize))
}
}
Note that with Swift 4, as an alternative to addObserver(_:, forKeyPath:, options:, context:) and observeValue(forKeyPath:, of:, change:, context:), you can use observe(_:, options:, changeHandler:) in order to track your UIScrollView subclass contentSize property changes:
import UIKit
class ViewController: UIViewController {
#IBOutlet weak var textView: UITextView!
var observer: NSKeyValueObservation?
/* ... */
override func viewDidLoad() {
super.viewDidLoad()
let handler = { (textView: UITextView, change: NSKeyValueObservedChange<CGSize>) in
if let contentSize = change.newValue {
print("contentSize:", contentSize)
}
}
observer = textView.observe(\UITextView.contentSize, options: [NSKeyValueObservingOptions.new], changeHandler: handler)
}
}
Are you on iOS? Because I am, I did the same thing and arrived at the same question; why NSSize? Maybe that's just the xcode terminal playing a trick on us.
Anyway, you can cast it to an NSValue then you will be able to use CGSizeValue:
if let zeChange = change as? [NSString: NSValue] {
let oldSize = zeChange[NSKeyValueChangeOldKey]?.CGSizeValue()
let newSize = zeChange[NSKeyValueChangeNewKey]?.CGSizeValue()
}
There's a simpler and arguably swiftier alternative.
You can subclass UICollectionViewLayout (or any of its subclasses, like UICollectionViewFlowLayout) and override a computed property collectionViewContentSize. By calling super you'll get the contentSize of your collection and be able to delegate this value back to your code.
So you'll have something like this:
protocol FlowLayoutDelegate: class {
func collectionView(_ collectionView: UICollectionView?, didChange contentSize: CGSize)
}
class FlowLayout: UICollectionViewFlowLayout {
weak var delegate: FlowLayoutDelegate?
override var collectionViewContentSize: CGSize {
let contentSize = super.collectionViewContentSize
delegate?.collectionView(collectionView, didChange: contentSize)
return contentSize
}
}
Check out this example code:
if context == ApprovalObservingContext{
if let theChange = change as? [NSString: Bool]{
var newContentSize = change[NSKeyValueChangeNewKey]?.CGSizeValue()
}
}
This is not giving any error.
class RecordSoundsViewController: UIViewController, AVAudioRecorderDelegate{
#IBOutlet weak var recordButton: UIButton!
#IBOutlet weak var recodinginProgress: UILabel!
#IBOutlet weak var stopButton: UIButton!
var audioPlayer: AVAudioPlayer!
var recordAudio: RecordedAudio!
var audioRecorder:AVAudioRecorder
override func viewDidLoad() {
super.viewDidLoad()
// 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 viewWillAppear(animated: Bool) {
//hide the stop button
stopButton.hidden = true
recordButton.enabled = true
}
#IBAction func recordAudio(sender: UIButton) {
recordButton.enabled = false
stopButton.hidden = false
recodinginProgress.hidden = false
//TODO: Record the user"s voice
let dirPath = NSSearchPathForDirectoriesInDomains(.DocumentDirectory,
.UserDomainMask, true)[0] as String
let currentDateTime = NSDate()
let formatter = NSDateFormatter()
formatter.dateFormat = "ddMMyyyy-HHmmss"
let recordingName = formatter.stringFromDate(currentDateTime)+".wav"
let pathArray = [dirPath, recordingName]
let filePath = NSURL.fileURLWithPathComponents(pathArray)
println(filePath)
var session = AVAudioSession.sharedInstance()
session.setCategory(AVAudioSessionCategoryPlayAndRecord, error: nil)
audioRecorder = AVAudioRecorder(URL: filePath, settings: nil, error: nil)
audioRecorder.delegate = self
audioRecorder.meteringEnabled = true
audioRecorder.prepareToRecord()
audioRecorder.record()
}
I don't know what I am doing wrong. My error is coming on my class.
It says
class RecordSoundsViewController has no initializers on RecordSoundsViewController: UIViewController, AVAudioRecorderDelegate{
The error message is a bit bad from the compiler. The reason you see the error is because you have a property which does not have a default value.
In Swift all values needs to have a default value unless it's an optional.
In your case it's this property: var audioRecorder:AVAudioRecorder
In your case I would make this property an optional: var audioRecorder:AVAudioRecorder? and make sure to check for nil when using. Or to make it an implicitly unwrapped optional (if you know there's always gonna be a value): var audioRecorder:AVAudioRecorder!
I have a profile view, where there are 4 TextField, in one of which must be inserted the date using a DatePicker, I realized, though, that this DatePicker is always visible, on the other hand I would like to appear when you click on the TextField that contains the date. How can I fix?
The code that I inserted is this:
import UIKit
class ProfileViewController: UIViewController {
#IBOutlet weak var bornDate: UITextField!
#IBOutlet weak var dateSec: UIDatePicker!
override func viewDidLoad() {
super.viewDidLoad()
dateSec.addTarget(self, action: Selector("datePickerChanged:"), forControlEvents: UIControlEvents.ValueChanged)
}
func datePickerChanged(datePicker:UIDatePicker) {
var dateFormatter = NSDateFormatter()
dateFormatter.dateStyle = NSDateFormatterStyle.ShortStyle
var strDate = dateFormatter.stringFromDate(dateSec.date)
bornDate.text = strDate
}
override func didReceiveMemoryWarning() {
super.didReceiveMemoryWarning()
// Dispose of any resources that can be recreated.
}
}
Ok, I solved the problem with the date format by inserting this piece of code:
var dateFormatter = NSDateFormatter() dateFormatter.dateFormat = "yyyy-MM-dd"
let d = NSDate()
let s = dateFormatter.stringFromDate(d)
println(s)
I have made a statusBar application with a drop down. I would like to open a settingsWindow from that dropdown. I have made the settings window with its own ViewController.
The issue is that i can't figure out how to instantiate and show the settingsWindow that i have made. I have tried to follow every thread on the internet without any success.
My Viewcontroller:
class SettingsViewController: NSViewController {
#IBOutlet var ipAddress: NSTextField!
#IBOutlet var port: NSTextField!
#IBAction func connect(sender: AnyObject) {}
override func viewDidLoad() {
super.viewDidLoad()
}
}
My AppDelegate:
class AppDelegate: NSObject, NSApplicationDelegate {
#IBOutlet var statusMenu: NSMenu!
var statusItem: NSStatusItem?
var tcpService: TcpService = TcpService()
func applicationDidFinishLaunching(aNotification: NSNotification?) {
let bar = NSStatusBar.systemStatusBar()
statusItem = bar.statusItemWithLength(20)
statusItem!.menu = statusMenu
statusItem!.image = NSImage(byReferencingFile: NSBundle.mainBundle().pathForResource("16*16", ofType: "png"))
statusItem!.highlightMode = true
tcpService.initOutputStream("192.168.1.1", Port: 8888)
}
func applicationWillTerminate(aNotification: NSNotification?) {
// Insert code here to tear down your application
}
#IBAction func openSettings(sender: AnyObject) {
// open settings for ip and port optional port
}
}
in swift 3:
var myWindow: NSWindow? = nil
let storyboard = NSStoryboard(name: "Main",bundle: nil)
let controller: EditorViewController = storyboard.instantiateController(withIdentifier: "editorViewController") as! ViewController
myWindow = NSWindow(contentViewController: controller)
myWindow?.makeKeyAndOrderFront(self)
let vc = NSWindowController(window: myWindow)
vc.showWindow(self)
For 2022
in your normal Main storyboard, tap to add a new window controller.
tap precisely on the red "X", then the blue circle, and then enter "ExampleID" at the green entry.
in your app's ordinary main view controller, add this
variable:
var otherWindow: NSWindowController?
function:
private func otherWindow() {
let sb = NSStoryboard(name: "Main", bundle: nil)
otherWindow = sb.instantiateController(
withIdentifier: "ExampleID") as! NSWindowController
otherWindow?.showWindow(self)
}
That's it.
Call otherWindow when you want to.
Problem:
Inevitably you will want to set up the otherWindow in a certain way, example, transparent, whatever. Unfortunately this is a whole topic in itself, but you do it like this:
private func otherWindow() {
... as above ...
otherWindow?.window?.ExampleSetup()
}
and then
extension NSWindow {
func ExampleSetup() {
self.styleMask = .borderless
self.collectionBehavior = [.fullScreenPrimary]
self.level = .floating
self.isMovable = false
self.titleVisibility = .hidden
// etc etc etc ..
guard let screen = self.screen ?? NSScreen.main else {
print("what the???")
return
}
self.setFrame(screen.frame, display: true)
// consider also .visibleFrame
}
}
enum Storyboards: String {
case main = "Main"
func instantiateVC<T>(_ identifier: T.Type) -> T? {
let storyboard = NSStoryboard(name: rawValue, bundle: nil)
guard let viewcontroller = storyboard.instantiateController(withIdentifier: String(describing: identifier)) as? T else { return nil}
return viewcontroller
}
}
var ssoLoginController: IDSSOLoginViewController?
var myWindow: NSWindow? = nil
ssoLoginController = Storyboards.main.instantiateVC(IDSSOLoginViewController.self)
myWindow = NSWindow(contentViewController: ssoLoginController!)
myWindow?.makeKeyAndOrderFront(self)
let vc = NSWindowController(window: myWindow)
vc.showWindow(self)
I am not 100% that I fully understand your problem, but assuming that you are using a storyboard (you should if you are starting fresh), adding few lines to your applicationDidFinishLaunching method will help:
var myWindow: NSWindow? = nil
let storyboard = NSStoryboard(name: "Main",bundle: nil)
let controller: SettingsViewController = storyboard?.instantiateControllerWithIdentifier("SettingsViewController") as SettingsViewController
myWindow = controller.window
myWindow?.makeKeyAndOrderFront(self)
Do not forget to set the Storyboard ID in IB (in the example above to SettingsViewController)!