I am having trouble calling the tweet function. I keep getting errors with the parameters. I also tried just (AnyObject) and got
Error: argument type does not conform to expected...
I am new to swift and not sure how to get this running. Tried everything I can think of. Thank you
// from GameScene
var vc = ViewController()
vc.tweetAction(sender: AnyObject)
//error: cannot create single-element tuple with an element label
//function in View Controller below
#IBAction func tweetAction(sender: AnyObject){
if SLComposeViewController.isAvailableForServiceType(SLServiceTypeTwitter){
let tweetController = SLComposeViewController(forServiceType: SLServiceTypeTwitter)
tweetController.setInitialText("I Scored on this app")
self.presentViewController(tweetController, animated: true, completion: nil)
}
else{
let alert = UIAlertController(title: "Accounts", message: "Please log into your twitter to share", preferredStyle: UIAlertControllerStyle.Alert)
alert.addAction(UIAlertAction(title: "Dismiss", style: UIAlertActionStyle.Default, handler: nil))
alert.addAction(UIAlertAction(title: "Settings", style: UIAlertActionStyle.Default, handler: { (UIAlertACtion) in
let settingsURL = NSURL(string:UIApplicationOpenSettingsURLString)
if let url = settingsURL{
UIApplication.sharedApplication().openURL(url)
}
}))
self.presentViewController(alert, animated: true, completion: nil)
}
}
You are passing a type to your method invocation instead of an instance. You also are including a label for the first parameter, which is incorrect. Try:
vc.tweetAction(self)
Try to change sender parameter type from AnyObject to UILabel
var vc = ViewController()
vc.tweetAction(yourUILabelInstance)
And don't forget to modify tweetAction function as well
#IBAction func tweetAction(sender: UILabel){
...
}
Related
I have a closure as a handler for items that are added to a UIAlertController. I receive the id value inside the closure as expected. (I don't use it in the snippet).
But the problem that I have is that I want to switch to another view controller. But I do this call inside the closure.
I get the following error:
Value of type '(ChooseProfile) -> () -> (ChooseProfile)' has no member 'present'
How can I switch to another view controller from within my closure?
class ChooseProfile: UIViewController {
let closure = { (id: String) in { (action: UIAlertAction!) -> Void in
let storyBoard : UIStoryboard = UIStoryboard(name: "Main", bundle:nil)
let nextViewController = storyBoard.instantiateViewController(withIdentifier: "test") as! UIViewController
self.present(nextViewController, animated:true, completion:nil)
}}
}
I use this closure because of this:
override func viewDidAppear(_ animated: Bool) {
let alert = UIAlertController(title: "Choose a Device", message: "Which device would you like to use in this app?", preferredStyle: UIAlertControllerStyle.alert)
for dev in (DataSingleton.instance.getDevices())! {
alert.addAction(UIAlertAction(title: dev.getName(), style: UIAlertActionStyle.default, handler: closure(dev.getId())))
}
alert.addAction(UIAlertAction(title: "Add a new Profile", style: UIAlertActionStyle.destructive, handler: nil))
// show the alert
self.present(alert, animated: true, completion: nil)
}
I add the alert actions based on a list of devices. And I want to retrieve the id when I click on a device.
The problem is that you are using self in your closure, but that self doesn't refer to the instance of your VC because it hasn't been fully created yet. Instead, why not pass the viewController to the closure when you call it?
class ChooseProfile: UIViewController {
let closure = { (id: String, vc: UIViewController) in { [weak vc] (action: UIAlertAction!) -> Void in
let storyBoard : UIStoryboard = UIStoryboard(name: "Main", bundle:nil)
let nextViewController = storyBoard.instantiateViewController(withIdentifier: "test")
vc?.present(nextViewController, animated:true, completion:nil)
}}
}
override func viewDidAppear(_ animated: Bool) {
let alert = UIAlertController(title: "Choose a Device", message: "Which device would you like to use in this app?", preferredStyle: UIAlertControllerStyle.alert)
for dev in (DataSingleton.instance.getDevices())! {
alert.addAction(UIAlertAction(title: dev.getName(), style: UIAlertActionStyle.default, handler: closure(dev.getId(), self)))
}
alert.addAction(UIAlertAction(title: "Add a new Profile", style: UIAlertActionStyle.destructive, handler: nil))
// show the alert
self.present(alert, animated: true, completion: nil)
}
I am trying to implement the Action sheet in Swift. Below is the code to implement it. When i execute the code, Xcode does not show any errors and the action sheet does not appear in the simulator. Any help in resolving the issue is much appreciated.
override func viewWillAppear(_ animated: Bool) {
super.viewWillAppear(animated)
func showActionSheet(sender: AnyObject) {
let actionSheetController: UIAlertController = UIAlertController(title: "Action Sheet", message: "Choose an option!", preferredStyle: .actionSheet)
//Create and add the Cancel action
let cancelAction: UIAlertAction = UIAlertAction(title: "Cancel", style: .cancel) { action -> Void in
//Just dismiss the action sheet
}
actionSheetController.addAction(cancelAction)
self.present(actionSheetController, animated: true, completion: nil)
The way your code is provided, it looks as if you added a method/function inside viewWillAppear. If that is not a typing mistake and you did indeed set your code up like that, modifying your code to look like this will get it to work:
override func viewDidAppear(_ animated: Bool) {
super.viewDidAppear(animated)
let actionSheetController: UIAlertController = UIAlertController(title: "Action Sheet", message: "Choose an option!", preferredStyle: .actionSheet)
//Create and add the Cancel action
let cancelAction: UIAlertAction = UIAlertAction(title: "Cancel", style: .cancel) { action -> Void in
//Just dismiss the action sheet
}
actionSheetController.addAction(cancelAction)
self.present(actionSheetController, animated: true, completion: nil)
}
Basically, do not have a method inside viewWillAppear but also move your action sheet display code to viewDidAppear instead of viewWillAppear
I finally managed to get the SignUp to work, but when trying to confirm the signup, I'm reaching a problem. Here is my code:
var user: AWSCognitoIdentityUser?
#IBAction func submitButton(_ sender: Any) {
guard let confirmationCodeValue = self.codeTextField.text, !confirmationCodeValue.isEmpty else {
let confirmationAlert = UIAlertController(title: alertTitle, message: alertMessage, preferredStyle: .alert)
confirmationAlert.addAction(UIAlertAction(title: "好", style: .default, handler: {action in
print("Try again!")
}))
self.present(confirmationAlert, animated: true, completion: nil)
return
}
self.user?.confirmSignUp(self.codeTextField.text!, forceAliasCreation: true).continue({[weak self] (task: AWSTask) -> Any? in
guard let strongSelf = self else { return nil }
DispatchQueue.main.async(execute: {
print("At least this is working...")
if let error = task.error {
let confirmationFailAlert = UIAlertController(title: (error as NSError).userInfo["__type"] as? String,
message: (error as NSError).userInfo["__type"] as? String,
preferredStyle: .alert)
confirmationFailAlert.addAction(UIAlertAction(title: "好",
style: .default,
handler: {action in
}))
self?.present(confirmationFailAlert, animated: true, completion: nil)
} else {
let confirmationSuccessAlert = UIAlertController(title: self?.alertTitleConfirmationComplete,
message:self?.alertMessageConfirmationComplete,
preferredStyle: .alert)
confirmationSuccessAlert.addAction(UIAlertAction(title: "好",
style: .default,
handler: {action in
self?.dismiss(animated: true, completion: nil)
}))
self?.present(confirmationSuccessAlert, animated: true, completion: nil)
}
})
return nil
})
}
The first part of this code works fine. If I type nothing in the space, I get an alertView telling me so. However, if I type anything in the space, nothing happens. The print statement "At least this is working..." never gets called. I've been staring at this code for a couple hours now trying to figure out what's wrong, and I feel like it's probably something simple, but as of now, I could use some help!
Thanks in advance!
I assume the code block above is not the full source, but be sure the optional, user, is "unencapsulated" and equal to an actual instance of AWSCognitoIdentityUser.
If it isn't, which I am assuming it is not, confirmSignUp won't know the username, sub, or have any information on the user it is "confirming".
I would recommend logging user and be sure that username is in fact a value within user.
I believe you set it equal to that instance type in the response to your AWSCognitoIdentityUserPool class signUp:password:userAttributes:validationData: call.
Check those values that are returned in AWSCognitoIdentityUserPoolSignUpResponse.
I am trying to create an alert view that performs a certain action when the button is clicked. I have tried creating a new class for the alert view, but when I try to add an action to the alert view controller, Xcode tells me that it is expecting a declaration, although the variable is declared just two steps above the line where the error occurs. Here's the code
class alerts: UIAlertController {
var alertThenGenerateNewThingController: UIAlertController = UIAlertController()
var generateNewThingOkButton = UIAlertAction (title: "OK", style: UIAlertActionStyle.Default) {
UIAlertAction in
println ("generate new thing action")
}
alertThenGenerateNewThingController.addAction (generateNewThingOkButton) // Here is where Xcode says it expected a declaration
func alertThenGenerateNewThing (alertTitle: String, alertMessage: String) {
alertThenGenerateNewThingController = UIAlertController (title: alertTitle, message: alertMessage, preferredStyle: .Alert)
self.presentViewController (alertThenGenerateNewThingController, animated: true, completion: nil)
}
}
You can't subclass UIAlertController, for one thing. Second of all, you can only interact with object properties inside of methods, functions, or the global scope. Run this code inside of the view controller where you plan on presenting your alert:
class viewController: UIViewController {
var alertThenGenerateNewThingController: UIAlertController = UIAlertController()
var generateNewThingOkButton = UIAlertAction (title: "OK", style: UIAlertActionStyle.Default) {
UIAlertAction in
println ("generate new thing action")
}
override func viewDidLoad() {
alertThenGenerateNewThingController.addAction(generateNewThingOkButton)
}
func alertThenGenerateNewThing (alertTitle: String, alertMessage: String) {
alertThenGenerateNewThingController = UIAlertController (title: alertTitle, message: alertMessage, preferredStyle: .Alert)
self.presentViewController (alertThenGenerateNewThingController, animated: true, completion: nil)
}
}
I've been looking up a lot of tutorials on UIAlertController. Thus far, the way I found was to activate a UIAlertController by linking it to a button or label and then call a IBAction.
I tried to replicate the code to automatically pop an alert when user enters the app (I wanted to ask the user if they want to go through the tutorial). However, I keep getting the error:
Warning: Attempt to present UIAlertController on MainViewController whose view is not in the window hierarchy!
Then I tried to add the UIAlertController to the MainViewController via addChildViewController and addSubview. However, I get the error:
Application tried to present modally an active controller
I figured that I cannot use the presentViewController function and commented it out.
The UIAlertController is displayed BUT when I tried to click on the cancel or the never button, this error occurs.
Trying to dismiss UIAlertController with unknown presenter.
I am really stumped. Can someone share what I am doing wrong? Thank you so much. Here is the code.
func displayTutorial() {
alertController = UIAlertController(title: NSLocalizedString("tutorialAlert", comment: ""), message: NSLocalizedString("tutorialMsg", comment: ""), preferredStyle: .ActionSheet)
self.addChildViewController(alertController)
self.view.addSubview(alertController.view)
alertController.didMoveToParentViewController(self)
alertController.view.frame.origin.x = self.view.frame.midX
alertController.view.frame.origin.y = self.view.frame.midY
//alertController.popoverPresentationController?.sourceView = self.view*/
let OkAction = UIAlertAction(title: NSLocalizedString("yesh", comment: ""), style: .Destructive) { (action) in
}
alertController.addAction(OkAction)
let cancelAction = UIAlertAction(title: NSLocalizedString("notNow", comment: ""), style: .Destructive) { (action) in
//println(action)
self.tutorial = 1
self.presentedViewController?.dismissViewControllerAnimated(true, completion: nil)
}
alertController.addAction(cancelAction)
let neverAction = UIAlertAction(title: NSLocalizedString("never", comment: ""), style: .Cancel) { (action) in
self.tutorial = 1
}
alertController.addAction(neverAction)
//self.presentViewController(alertController, animated: false) {}
}
I found the solution. Apparently, I cannot call the UIAlertController from the func viewDidLoad. I must call the function from viewDidAppear. So my code now is
override func viewDidAppear(animated: Bool) {
if tutorial == 0 {
displayTutorial(self.view)
}
}
func displayTutorial(sender:AnyObject) {
let alertController = UIAlertController(title: NSLocalizedString("tutorialAlert", comment: ""), message: NSLocalizedString("tutorialMsg", comment: ""), preferredStyle: .ActionSheet)
let OkAction = UIAlertAction(title: NSLocalizedString("yesh", comment: ""), style: .Destructive) { (action) in
}
alertController.addAction(OkAction)
let cancelAction = UIAlertAction(title: NSLocalizedString("notNow", comment: ""), style: .Default) { (action) in
//println(action)
self.tutorial = 1
self.presentedViewController?.dismissViewControllerAnimated(true, completion: nil)
}
alertController.addAction(cancelAction)
let neverAction = UIAlertAction(title: NSLocalizedString("never", comment: ""), style: .Cancel) { (action) in
self.tutorial = 1
}
alertController.addAction(neverAction)
self.presentViewController(alertController, animated: true, completion: nil)
if let pop = alertController.popoverPresentationController {
let v = sender as UIView
pop.sourceView = view
pop.sourceRect = v.bounds
}
}
Thanks to this posting: Warning: Attempt to present * on * whose view is not in the window hierarchy - swift
Below UIAlertController with extension would help you show alert with dynamic number of buttons with completion handler for selected index
extension UIViewController {
func displayAlertWith(message:String) {
displayAlertWith(message: message, buttons: ["Dismiss"]) { (index) in
}
}
func displayAlertWith(message:String, buttons:[String], completion:((_ index:Int) -> Void)!) -> Void {
displayAlertWithTitleFromVC(vc: self, title: Bundle.main.infoDictionary!["CFBundleDisplayName"] as! String, andMessage: message, buttons: buttons, completion: completion)
}
func displayAlertWithTitleFromVC(vc:UIViewController, title:String, andMessage message:String, buttons:[String], completion:((_ index:Int) -> Void)!) -> Void {
let alertController = UIAlertController(title: title, message: message, preferredStyle: .alert)
for index in 0..<buttons.count {
let action = UIAlertAction(title: buttons[index], style: .default, handler: {
(alert: UIAlertAction!) in
if(completion != nil){
completion(index)
}
})
alertController.addAction(action)
}
DispatchQueue.main.async {
vc.present(alertController, animated: true, completion: nil)
}
}
}
If you need to auto dismiss the alert you can call dismiss on presented view controller after some delay.
DispatchQueue.main.asyncAfter(deadline: DispatchTime.now() + 1) {
vc.dismiss(animated: true, completion: nil)
}
Hope this might help you.