i want to set an UITapGestureRecognizer to permit to user to add an image as profile. I set the code but, when i touch on the image, nothing happens. Here the code:
#IBAction func selezionaFoto(sender: UITapGestureRecognizer) {
fieldNome.resignFirstResponder()
func selezionaLibreria(action : UIAlertAction!) {
UIApplication.sharedApplication().setStatusBarStyle(UIStatusBarStyle.Default, animated: true)
CameraManager.sharedInstance.newImageFromLibraryForController(self, editing: false)
}
func scattaFoto(action : UIAlertAction!) {
UIApplication.sharedApplication().setStatusBarStyle(UIStatusBarStyle.Default, animated: true)
var circle = UIImageView(frame: UIScreen.mainScreen().bounds)
circle.image = UIImage(named: "overlay")
CameraManager.sharedInstance.newImageShootForController(self, editing: false, overlay:circle)
}
var myActionSheet = UIAlertController(title: NSLocalizedString("ACTION_IMAGE_TITLE", comment: ""),
message: NSLocalizedString("ACTION_IMAGE_TEXT", comment: ""),
preferredStyle: UIAlertControllerStyle.ActionSheet)
myActionSheet.addAction(UIAlertAction(title: NSLocalizedString("BUTTON_LIBRARY", comment: ""),
style: UIAlertActionStyle.Default,
handler: selezionaLibreria))
myActionSheet.addAction(UIAlertAction(title: NSLocalizedString("BUTTON_SHOOT", comment: ""),
style: UIAlertActionStyle.Default,
handler: scattaFoto))
myActionSheet.addAction(UIAlertAction(title: NSLocalizedString("BUTTON_CANCEL", comment: ""),
style: UIAlertActionStyle.Cancel,
handler: nil))
self.presentViewController(myActionSheet, animated: true, completion: nil)
}
func textFieldShouldReturn(textField: UITextField) -> Bool {
textField.resignFirstResponder()
return true
}
func incomingImage(image: UIImage) {
UIApplication.sharedApplication().setStatusBarStyle(UIStatusBarStyle.LightContent, animated: true)
immagine.image = image
immagineSelezionata = image
}
func cancelImageSelection() {
UIApplication.sharedApplication().setStatusBarStyle(UIStatusBarStyle.LightContent, animated: true)
}
The first element in the storyboard is the image and then there is the textfield.
I recently faced the same issue, I had complicated view hierarchy and the reason why gesture didnt respond to the action, was that one superView was set to isUserInteractionEnabled to false, and as you may know, how gestures received by the app and go to the responder in the chain, is that all UIResponders in this chain should be isUserInteractionEnabled = true, to be delivered to the most top view. I assume that you faced the same situation, so just check all the views in the hierarchy.
I'm not 100% sure I understand your question, but it looks like you're just creating a UITapGestureRecognizer on your storyboard and connecting an action to it.
I think you mean to add a UITapGestureRecognizer to a UIImageView, which you can do like this:
var myImageview = UIImageView()
var myTapGestureRecognizer = UITapGestureRecognizer()
myImageview.addGestureRecognizer(myTapGestureRecognizer)
myTapGestureRecognizer.addTarget(self, action: Selector("methodName:"))
myImageview.userInteractionEnabled = true
func methodName(sender: UITapGestureRecognizer) {
// do stuff
}
Related
I am preventing the user from going to the loginViewController from the mainMenuViewController, and it works good.
But if i go to another viewController, pop it to the mainMenu, and press fast the menuButton, it goes to the login instead entering the gestureRecognized func.
I have this code on the viewDidLoad()
let menuPressRecognizer = UITapGestureRecognizer()
menuPressRecognizer.addTarget(self, action: #selector(menuButtonAction(recognizer:)))
menuPressRecognizer.allowedPressTypes = [NSNumber(value: UIPress.PressType.menu.rawValue)]
self.view.addGestureRecognizer(menuPressRecognizer)
And this:
#objc func menuButtonAction(recognizer:UITapGestureRecognizer) {
let allertController=UIAlertController(title: R.string.strings.closeSession(), message: "", preferredStyle: .alert)
allertController.addAction(UIAlertAction(title: R.string.strings.closeSessionConfirm(), style: .default, handler: {_ in
UserDefaults.standard.set(false, forKey: .storedAutoLogin)
self.navigationController?.popViewController()
}))
allertController.addAction(UIAlertAction(title: R.string.strings.cancel(), style: .cancel, handler: nil))
self.present(allertController, animated: true, completion: nil)
}
Tried overriding pressesBegan, but it pop to login after printing "test", so i don't know why it don't override the pop
override func pressesBegan(_ presses: Set<UIPress>, with event: UIPressesEvent?) {
if(presses.first?.type == UIPress.PressType.menu) {
NSLog("test")
} else {
super.pressesBegan(presses, with: event)
}
}
In my case, I need to show the user the UIAlertController upside down.
At the time of present, I can avoid the opening animation with:
present(alert, animated: false, completion: {
alert.view.transform = CGAffineTransform(rotationAngle: .pi)
})
At this point, the user sees the inverted UIAlertController.
And at the time of closing, after clicking on Cancel, UIAlertController blinks in the normal position for a hundredth of a second, which slightly spoils the UX.
With this simple example, you can catch this slight blink:
let alert = UIAlertController(title: "Title", message: "Message", preferredStyle: .alert)
let action = UIAlertAction(title: "Action", style: .default, handler: { action in })
let cancel = UIAlertAction(title: "Cancel", style: .destructive, handler: { action in })
alert.addAction(action)
alert.addAction(cancel)
present(alert, animated: false, completion: {
alert.view.transform = CGAffineTransform(rotationAngle: .pi)
})
I tried to call
alert.dismiss(animated: false, completion: nil)
or
alert.view.isHidden = true
inside cancel action, but it didn’t work.
Help me find a way to avoid this annoying end animation.
Just subclass UIAlertController like this:
class InstantCloseAlertController: UIAlertController {
override func viewWillDisappear(_ animated: Bool) {
super.viewWillDisappear(animated)
UIView.setAnimationsEnabled(false)
}
override func viewDidDisappear(_ animated: Bool) {
super.viewDidDisappear(animated)
UIView.setAnimationsEnabled(true)
}
}
I have a navigation controller view, with an embedded collectionview controller. I have a right bar button added programmatically, with an image added to it as follows:
self.navigationItem.rightBarButtonItem = UIBarButtonItem(image: #imageLiteral(resourceName: "greyCircle").withRenderingMode(.alwaysOriginal), style: .plain, target: self, action: #selector (handleGrayCircleButton))
I would like a user that clicks on this button, to be able to change the image from grey to silver. I have the button handler set up to switch from grey to silver with each press:
self.navigationItem.rightBarButtonItem?.image = UIImage(named: "greyCircle")
However, the image only changes briefly before switching back. I have tried to save the color of the image as a 'flag' variable, i.e. if it is currently grey, turn to silver, in order to make the change persist, however, the image continually resets to whatever it is loaded with (either with viewDidLoad or viewWillAppear).
Is there anyway to refresh/reload the navigationController tab bar after each click and make it persist, along with the images for the bar buttons?
#
EDIT: Following is full button handler.
func handleFavoritePress(){
print("Favorites pressed")
if(!returnTrueIfInFavorites(objectName: readString(object: self.patientRecord!, key: "name"), objectType: LIST_CoreDataBaseObjects.Patients)){
// Add to favorites
Favorites_Names.append(readString(object: self.patientRecord!, key: "name"))
Favorites_Types.append(LIST_CoreDataBaseObjects.Patients)
// Let user know
let patientName = readString(object: self.patientRecord!, key: "name")
let alertController = UIAlertController(title: "Alert!", message: "\(patientName) has been added to your favorites.", preferredStyle: .alert)
let defaultAction = UIAlertAction(title: "OK", style: .default, handler: nil)
alertController.addAction(defaultAction)
var rootViewController = UIApplication.shared.keyWindow?.rootViewController
if let navigationController = rootViewController as? UINavigationController {
rootViewController = navigationController.viewControllers.first
}
if let tabBarController = rootViewController as? UITabBarController {
rootViewController = tabBarController.selectedViewController
}
rootViewController?.present(alertController, animated: true, completion: nil)
self.navigationItem.rightBarButtonItem?.image = UIImage(named: "savedFavorite_1")
}else{
self.navigationItem.rightBarButtonItem?.image = UIImage(named: "favorite_2")
deleteFromFavorites(objectName: readString(object: patientRecord!, key: "name"), objectType: LIST_CoreDataBaseObjects.Patients)
}
for favorite in Favorites_Names{
print("Favorites are currently: \(patient)")
}
}
And other functions:
override func viewWillAppear(_ animated: Bool) {
collectionView?.backgroundView = setBackgroundImage(imageName: "whiteBackground")
navigationItem.title = "Patient"
if(returnTrueIfInFavorites(objectName: readString(object: patientRecord!, key: "name"), objectType: LIST_CoreDataBaseObjects.Patients)){
setupNavBarButtonsIsFavorited()
}else{
setupNavBarButtonsNotFavorited()
}
}
func setupNavBarButtonsNotFavorited(){
self.navigationItem.rightBarButtonItem = UIBarButtonItem(image: #imageLiteral(resourceName: "favorite_2").withRenderingMode(.alwaysOriginal), style: .plain, target: self, action: #selector (handleFavoritePress))
}
func setupNavBarButtonsIsFavorited(){
self.navigationItem.rightBarButtonItem = UIBarButtonItem(image: #imageLiteral(resourceName: "savedFavorite_1").withRenderingMode(.alwaysOriginal), style: .plain, target: self, action: #selector (handleFavoritePress))
}
The answer to your question lies within this two LIST_CoreDataBaseObjects.Patients, returnTrueIfInFavorites or the patientRecord variable.
Either LIST_CoreDataBaseObjects.Patients did not get updated on your function handleFavoritePress's code
/* this code */
Favorites_Names.append(readString(object: self.patientRecord!, key: "name"))
Favorites_Types.append(LIST_CoreDataBaseObjects.Patients)
/* this code */
Because from what you've explained in the comments section, if I understood it correctly, is that when you tap the button the image changes, and then you navigate to a different view, but then when you navigate back, viewDidAppear(_:) and viewWillAppear(_:) will be triggered.
Which in the code block below I will explain
// this function will be triggered everytime you navigate into this view (because it has appeared)
override func viewWillAppear(_ animated: Bool) {
/* don't forget to call super.viewWillAppear(true) */
super.viewWillAppear(true)
/* don't forget to call super.viewWillAppear(true) */
collectionView?.backgroundView = setBackgroundImage(imageName: "whiteBackground")
navigationItem.title = "Patient"
// the problem lies here
/* the function `(returnTrueIfInFavorites(objectName: readString(object: patientRecord!, key: "name"), objectType: LIST_CoreDataBaseObjects.Patients))` is always returning one thing which is why your image returns back to its previous state */
if (returnTrueIfInFavorites(objectName: readString(object: patientRecord!, key: "name"), objectType: LIST_CoreDataBaseObjects.Patients)) {
setupNavBarButtonsIsFavorited() // only one of these gets called
} else {
setupNavBarButtonsNotFavorited() // only one of these gets called
}
}
func setupNavBarButtonsNotFavorited() {
self.navigationItem.rightBarButtonItem = UIBarButtonItem(image: #imageLiteral(resourceName: "favorite_2").withRenderingMode(.alwaysOriginal), style: .plain, target: self, action: #selector (handleFavoritePress))
}
func setupNavBarButtonsIsFavorited() {
self.navigationItem.rightBarButtonItem = UIBarButtonItem(image: #imageLiteral(resourceName: "savedFavorite_1").withRenderingMode(.alwaysOriginal), style: .plain, target: self, action: #selector (handleFavoritePress))
}
All of these or you're just not updating the variable self.patientRecord!'s value (I haven't seen any setting in your code relating to this variable)
Opening the UIAlertController on button click, the action is going to open but main issue is the UIAlertAction methods are not performed on its click. Here is Code block :
class HomeViewController: UIViewController {
override func viewDidLoad() {
super.viewDidLoad()
// getData()
}
override func didReceiveMemoryWarning() {
super.didReceiveMemoryWarning()
// Dispose of any resources that can be recreated.
}
//menuBtn is the button
#IBAction func menuBtn(sender: UIButton) {
let optionMenu = UIAlertController(title: nil, message: nil, preferredStyle: .ActionSheet)
let orders = UIAlertAction(title: "Orders", style: .Default, handler: { (alert: UIAlertAction!) -> Void in
let alertViewController = self.storyboard?.instantiateViewControllerWithIdentifier("OrdersViewController") as! OrdersViewController
self.presentViewController(alertViewController, animated: true, completion: nil)
})
let about = UIAlertAction(title: "About", style: .Default, handler: {(alert: UIAlertAction!) -> Void in
let aboutObject = self.storyboard?.instantiateViewControllerWithIdentifier("AboutViewController") as! AboutViewController
self.presentViewController(aboutObject, animated: true, completion: nil)
})
let contactUs = UIAlertAction(title: "Contact Us", style: .Default, handler: {(alert: UIAlertAction!) -> Void in
let alertViewController = self.storyboard?.instantiateViewControllerWithIdentifier("ContactViewController") as! ContactViewController
self.presentViewController(alertViewController, animated: true, completion: nil)
})
let login = UIAlertAction(title: "LogIn", style: .Default, handler: {(alert: UIAlertAction!) -> Void in
let alertViewController = self.storyboard?.instantiateViewControllerWithIdentifier("LoginViewController") as! LoginViewController
self.presentViewController(alertViewController, animated: true, completion: nil)
})
let cancelAction = UIAlertAction(title: "Cancel", style: .Cancel, handler: nil)
optionMenu.addAction(orders)
optionMenu.addAction(about)
optionMenu.addAction(contactUs)
optionMenu.addAction(login)
optionMenu.addAction(cancelAction)
self.presentViewController(optionMenu, animated: true, completion: nil)
}
This is code is working fine, I have checked it's opening new viewController as well.
Cross check points:
Controller class and stroybaord are connected
Storyboard ID has been assigned
IBAction must be connected to IBOutlet
On the Button click Action you have to write code.. Try This code.
let alert = UIAlertController(title: "Saved", message: "Selected Frame is Saved", preferredStyle: .Alert)
alert.addAction(UIAlertAction(title: "Ok", style:.Default , handler: { (UIAlertAction) in
}))
//Add action like this
self.presentViewController(alert, animated: true, completion: nil)
Still need any help feel free to ask.
First of all check if the button action is touch up inside. Make the button action as touch up inside. Below code works for me. Hope this works for you as well. Change the action title according to your need.
#IBAction func menuBtn(sender: AnyObject) {
let actionSheet = UIAlertController()
let criticalAction = UIAlertAction(title : "CRITICAL" , style : UIAlertActionStyle.Default){
(action) in
//This section will be executed when the buttons are pressed
//Do your work here.
debugPrint("CRITICAL")
}
let highAction = UIAlertAction(title : "HIGH" , style : UIAlertActionStyle.Default){
(action) in
//This section will be executed when the buttons are pressed
//Do your work here.
debugPrint("HIGH")
}
actionSheet.addAction(criticalAction)
actionSheet.addAction(highAction)
self.presentViewController(actionSheet, 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.