I got this IBAction that shuffles a pack of cards randomly
#IBAction func playRoundTapped(sender: UIButton) {
cardNamesArray = GKRandomSource.sharedRandom().arrayByShufflingObjectsInArray(cardNamesArray) as! [String]
cardNamesArray2 = GKRandomSource.sharedRandom().arrayByShufflingObjectsInArray(cardNamesArray2) as! [String]
let firstCardString:String = self.cardNamesArray[0]
self.FirstCardImageView.image = UIImage(named: firstCardString)
let SecondCardString:String = self.cardNamesArray2[1]
self.SecondCardImageView.image = UIImage(named: SecondCardString)
}
...and this part of the code scores a point when the cards match, however when they macth I need to it to shuffle again. Can I use IBAction playRoundTapped inside IBAction snapButtonTapped?
#IBAction func SnapButtonTapped(sender: UIButton) {
if firstRandomNumber == SecondRandomNumber {
print("index match")
self.playerScore += 1
self.playerScoreLabel.text = String(self.playerScore)
cardNamesArray.removeAtIndex(firstRandomNumber)
cardNamesArray2.removeAtIndex(SecondRandomNumber)
if cardNamesArray.count == 0 && cardNamesArray2.count == 0{
print("user won")
//alert box
let alert = UIAlertController(title:"Level completed", message: "Your score is \(playerScore)", preferredStyle: UIAlertControllerStyle.Alert)
alert.addAction(UIAlertAction(title:"next level", style: UIAlertActionStyle.Default, handler: nil))
self.presentViewController(alert, animated:true, completion:nil)
}
}
Yes you can. An IBAction is just a method with a specific signature and a tag that tells Interface Builder it can be connected to controls. You are free to call it yourself.
Related
I'm trying to figure out how to keep the Action Button disabled until the user enters some text in, at which point the button would be enabled again. I've been searching around, and some people are suggesting to use Observers? Would that be the best way to go?
Cheers!
#objc func addExercise() {
var textField = UITextField()
let alert = UIAlertController(title: "New Exercise", message: "Please name your Exercise...", preferredStyle: .alert)
let cancelAction = UIAlertAction(title: "Cancel", style: .default) { (UIAlertAction) in
alert.dismiss(animated: true, completion: nil)
}
let addAction = UIAlertAction(title: "Add Exercise", style: .default) { (UIAlertAction) in
//Add Exercise to database.
//Append exercise to selected workout object.
let exercise = Exercises()
exercise.exerciseName = textField.text!
try! self.realm.write {
self.selectedWorkout?.exercise.append(exercise)
self.loadExercises()
}
}
alert.addTextField { (alertTextField1) in
alertTextField1.delegate = self
alertTextField1.placeholder = "Bench Press"
alertTextField1.text = textField.text
textField = alertTextField1
}
alert.addAction(addAction)
alert.addAction(cancelAction)
present(alert, animated: true, completion: nil)
}
Using notification is a way but long work instead you can use simple delegate method or action method of textfield which is much easier as follow:
weak var buttonActionToEnable: UIAlertAction?
alert.addTextField { (alertTextField1) in
alertTextField1.delegate = self
alertTextField1.placeholder = "Bench Press"
alertTextField1.text = textField.text
alertTextField1.addTarget(self, action: #selector(self.textFieldChanged), for: .editingChanged)
}
self.buttonActionToEnable = addAction
addAction.isEnabled = false
#objc func textFieldChanged(_ sender: Any) {
let textfield = sender as UITextField
self.buttonActionToEnable?.isEnabled = textfield.text.count > 0
}
My code is as follows:
#IBAction func clicked(_ sender: Any) {
let ref = Database.database().reference()
let pass = password.text
var firpass = ""
var bool = false;
ref.child(name.text as! String).child("password").observeSingleEvent(of: .value, with: { dataSnapshot in
firpass = dataSnapshot.value as! String
if firpass == pass {
bool = true
print("in here")
}
})
print(bool)
if bool {
self.sendname = name.text!
let vc = DatabaseTableViewController(nibName: "DatabaseTableViewController", bundle: nil)
vc.finalName = self.sendname
navigationController?.pushViewController(vc, animated: true)
performSegue(withIdentifier: "username", sender: self)
} else {
let alert = UIAlertController(title: "Error", message: "Incorrect username or password", preferredStyle: UIAlertController.Style.alert)
alert.addAction(UIAlertAction(title: "OK", style: UIAlertAction.Style.default, handler: nil))
self.present(alert, animated: true, completion: nil)
}
}
"in here" gets printed, but bool is never printed and the alert is showing. Why does my code not enter the if bool block and output the alert?
Data is loaded from Firebase asynchronously, since it may take a while. Instead of making your app wait for the data (which would be a bad user experience), your main code continues while the data is being loaded, and then once the data is available your closure is called.
This explains the behavior you're seeing: by the time your runs, the hasn't run yet.
the solution is as simple as it is initially confusing and annoying: any code that needs the data from the database must be inside the closure, or be called from there.
So for example:
ref.child(name.text as! String).child("password").observeSingleEvent(of: .value, with: { dataSnapshot in
firpass = dataSnapshot.value as! String
if firpass == pass {
bool = true
print("in here")
}
print(bool)
if bool {
self.sendname = name.text!
let vc = DatabaseTableViewController(nibName: "DatabaseTableViewController", bundle: nil)
vc.finalName = self.sendname
navigationController?.pushViewController(vc, animated: true)
performSegue(withIdentifier: "username", sender: self)
} else {
let alert = UIAlertController(title: "Error", message: "Incorrect username or password", preferredStyle: UIAlertController.Style.alert)
alert.addAction(UIAlertAction(title: "OK", style: UIAlertAction.Style.default, handler: nil))
self.present(alert, animated: true, completion: nil)
}
})
Also see:
Firebase with Swift 3 counting the number of children
Array of struct not updating outside the closure
getting data out of a closure that retrieves data from firebase (showing examples with custom callbacks and delegates)
How to reload data after all Firebase calls finished? (showing how to use a dispatch group)
Finish all asynchronous requests before loading data? (another example using a dispatch group)
Also you have to set variable bool to false when you are navigating to next view controller after login. So that you login again and if password is wrong then you can not navigate to next page and only it shows alert for wrong password.
UIAlewrtController pushes the button in my navigation controller down (see image)
Sequence of execution:
on push + the alert controller is activated
on selecting "Take an Action" or "Request an Action" the view controller ActionDetialsVC is activated.
on showing ActionDetialsVC
on back the ActionDetialsVC is closed
The iitial controlers BACK arrow moved
When putting breakpoints on:
self.present (alert, animated: true, completion: nil)
the first Swift instruction in the 2 alert handlers
The strange navigation back button behavior is visible between these breakpoints.
The issue ONLY occurs when introducing Alert Controllers in my views !!!!!
Thank you for your help
Image of the issue:
The code:
func addPressed(_ sender: Any) {
let alert = UIAlertController (title: "Add an Action", message: nil, preferredStyle: UIAlertControllerStyle.alert)
let request = UIAlertAction (title: actionType.Request.Str(), style: UIAlertActionStyle.default, handler: {
action in
self.actionTypeTemp = actionType.Request.Str()
self.performSegue(withIdentifier: "segueActionDetailsVC", sender: nil)
} )
let take = UIAlertAction (title: actionType.Take.Str(), style: UIAlertActionStyle.default, handler: {
action in
self.actionTypeTemp = actionType.Take.Str()
self.performSegue(withIdentifier: "segueActionDetailsVC", sender: nil)
} )
let done = UIAlertAction (title: "Cancel", style: UIAlertActionStyle.cancel, handler: nil )
alert.addAction(request)
alert.addAction(take)
alert.addAction(done)
self.present (alert, animated: true, completion: nil)
}
override func prepare(for segue: UIStoryboardSegue, sender: Any?) {
if segue.identifier == "segueActionDetailsVC" {
if let destination = segue.destination as? ActionDetailsVC {
if let action = sender as? PActions {
destination.actionToEdit = action
}
else {
if actionTypeTemp == actionType.Request.Str() {
destination.relatedContact = self.contact
destination.title = actionType.Request.Str()
}
else {
destination.relatedContact = self.contact
destination.title = actionType.Take.Str()
}
}
}
}
}
If a textfield is empty, I would like to make an UIAlertController to remind, that something has to be filled out in the textfield. Now I have the following code:
#IBAction func saveDetails(segue: UIStoryboardSegue) {
let dController = segue.source as? EntryTableViewController
if let text = dController?.bezeichnungTextField.text, text.isEmpty {
let alert = UIAlertController(title: "No description", message: "Please fill out description", preferredStyle: .alert)
let cancelAction = UIAlertAction(title: "OK", style: .default)
alert.addAction(cancelAction)
self.present(alert, animated: true, completion: nil)
}else {
guard let menge = dController?.mengeTextField.text, let bezeichnung = dController?.bezeichnungTextField.text, let kategorie = dController?.categoryButtonOutlet.titleLabel?.text else {return}
self.saveItem(menge: menge, bezeichnung: bezeichnung, kategorie: kategorie)
self.tableView.reloadData()
}
}
Now actually it works when I press the button to return to the first controller. But the UIAlertController only appears for a very short moment and then disappears automatically. Is there a mistake in my code or isn't it possible to call the UIAlertController on a unwind segue?
Thank you for your help
You just show the alert controller and then immediately unwind. The solution is to check for the empty textfield before unwinding.
Make IBAction for your button then check the textfield if it is empty and then perforn your segue programmatically.
I am using MWPhotoBrowser for my app. I need to give delete functionality to my users. Is there any way we can implement delete a particular photo or multiple photos functionality?
Quick help needed.
I did this in swift by adding this extension from outside of the library:
extension MWPhotoBrowser {
public override func viewWillLayoutSubviews() {
super.viewWillLayoutSubviews()
if let _ = valueForKey("_gridController") as? MWGridViewController {
let leftButtonItem = editButtonItem()
//leftButtonItem.tintColor = QorumColors.ThemeWhite
navigationItem.leftBarButtonItem = leftButtonItem
} else {
navigationItem.leftBarButtonItem = nil
}
}
public override func setEditing(editing: Bool, animated: Bool) {
super.setEditing(editing, animated: animated)
if editing {
navigationItem.leftBarButtonItem?.title = "Delete"
//navigationItem.leftBarButtonItem?.tintColor = QorumColors.Nickname
displaySelectionButtons = true
title = "Delete Photos"
let gridController = valueForKey("_gridController") as! MWGridViewController
gridController.selectionMode = displaySelectionButtons
gridController.collectionView!.reloadData()
} else {
let nav = self.navigationController as! TempPresentVC
let photosToDelete = nav.selectedPhotos
let afterButtonPress = {
//self.navigationItem.leftBarButtonItem?.tintColor = QorumColors.ThemeWhite
self.displaySelectionButtons = false
self.updateNavigation()
let gridController = self.valueForKey("_gridController") as! MWGridViewController
gridController.selectionMode = self.displaySelectionButtons
gridController.collectionView!.reloadData()
}
guard photosToDelete.count > 0 else {
afterButtonPress()
return
}
let title = "Delete Photo"
let message = "Are you sure you want to delete these photos?"
let action = "Delete"
let cancelAction = "Cancel"
let alert = UIAlertController(title: title, message: message, preferredStyle: UIAlertControllerStyle.Alert)
let declineButton = UIAlertAction(title: cancelAction, style: .Default, handler: { (action: UIAlertAction) in
afterButtonPress()
})
let acceptButton = UIAlertAction(title: action, style: .Default, handler: { (action: UIAlertAction) in
afterButtonPress()
})
alert.addAction(declineButton)
alert.addAction(acceptButton)
UIApplication.topMostController().presentVC(alert) //private lib
}
}
}
class TempPresentVC: UINavigationController, MWPhotoBrowserDelegate {
var selectedPhotos = [Int]()
func photoBrowser(photoBrowser: MWPhotoBrowser!, photoAtIndex index: UInt, selectedChanged selected: Bool) {
if selected {
selectedPhotos.append(index.toInt)
} else {
selectedPhotos.removeObject(index.toInt)
}
}
}
This doesn't allow you to delete a photo in a single photo view mode, but starting from this code base that part would be easy to implement.
Beware, some of the stuff I use inside are private functions I wrote in my other classes, what they do should be clear though.