whenever the user presses on a logo, a counter will count from 0 to 3. after these 3 seconds, I am presenting the message controller for the user:
if MFMessageComposeViewController.canSendText() == true {
print(self.urgentNumber)
let recipients:[String] = ["\(self.urgentNumber as! String)"]
self.messageController.messageComposeDelegate = self as?
MFMessageComposeViewControllerDelegate
self.messageController.recipients = recipients
self.messageController.body = "Hey,\nmy longitude: \
(self.userLocation.coordinate.longitude) \nmy latitude: \
(self.userLocation.coordinate.latitude)"
self.present(self.messageController, animated: true,
completion: nil)
} else {
//handle text messaging not available
}
when the user presses cancel or send the message, I am detecting this in :
func messageComposeViewController(_ controller: MFMessageComposeViewController, didFinishWith result: MessageComposeResult) {
messageController.dismiss(animated: true, completion: nil)
}
here the user should wait 20 sec to send another message:
DispatchQueue.main.asyncAfter(deadline: .now() + 20, execute: {
self.reSetAnimations()
})
The problem is, When the user presses on the logo the second time( After waiting the 20 sec to give him the ability to press again), the message controller is not opening again!
any idea why?
Try to create a new instance of the MFMessageComposeViewController instead of reusing the old one.
Related
Hi I am writing the following code to refer a friend through SMS.
When I click on cell, the sms app opens with text but when again I tried for second time, it shows white color screen.
Here is my code
var controller1 = MFMessageComposeViewController()
extension ReferaFriendController:UICollectionViewDelegate,UICollectionViewDataSource,MFMessageComposeViewControllerDelegate
{
if indexPath.item == 0
{
if MFMessageComposeViewController.canSendText() {
let urlToShare = self.referalmodeldata[0].referralCodeOnly
controller1.body = "Hey I just gave an Awesome Assessment on App you can also try it. I scored , Try to beat my score \(String(describing: urlToShare))"
controller1.messageComposeDelegate = self
self.present(controller1, animated: true, completion: nil)
}
}
func messageComposeViewController(_ controller: MFMessageComposeViewController, didFinishWith result: MessageComposeResult) {
self.dismiss(animated: true, completion: nil)
}
}
As far as I can see, there's no need to keep a reference to the MFMessageComposeViewController. Just move it to be created at the point you need it, inside your if closure:
if MFMessageComposeViewController.canSendText() {
let controller = MFMessageComposeViewController()
// ...
}
I'm working for an app that has users. One of the functionalities is to allow a user to log out and be redirected to the first page. I came across the problem when a user logs out, a toast message "You logged out" should be displayed on the first view of the app and receiving the command from a different page. Basically a toast message that can work with all the views, not only with the current one.
I managed to call a toast function after a user logs out but it won't show the message because the current view is dismissed before to have the chance showing it.
This is the function called:
func showToast(controller: UIViewController, message : String, seconds: Double) {
let alert = UIAlertController(title: nil, message: message, preferredStyle: .alert)
alert.view.backgroundColor = UIColor.black
alert.view.alpha = 0.6
alert.view.layer.cornerRadius = 15
controller.present(alert, animated: true)
DispatchQueue.main.asyncAfter(deadline: DispatchTime.now() + seconds) {
alert.dismiss(animated: true)
}
}
If you dont know which the current presented VC is you could use this extension here:
extension UIWindow {
func topViewController() -> UIViewController? {
var top = self.rootViewController
while true {
if let presented = top?.presentedViewController {
top = presented
} else if let nav = top as? UINavigationController {
top = nav.visibleViewController
} else if let tab = top as? UITabBarController {
top = tab.selectedViewController
} else {
break
}
}
return top
}
}
Then you can call it it this way:
if let topVC = UIApplication.shared.keyWindow?.topViewController() {
topVC.present(alert, animated: true)
}
Another option is that you pop/dismiss your viewcontroller after you dismissed your alert:
DispatchQueue.main.asyncAfter(deadline: DispatchTime.now() + seconds) {
alert.dismiss(animated: true)
// popViewController or dismiss here
}
I am using Swift 3.
The behavior I am trying to do is: the user clicks on a button, a spinning gear alert controller displays while it kicks off a long-running function. Once that function is done executing, the spinning gear goes away and the view controller dismisses.
The code below kicks off the doProcessing function but doesn't display the spinning gear until about a second before the view dismisses. So this isn't quite right.
func displaySpinningGear() {
print("display spinning gear")
// show the alert window box
let activityAlertController = UIAlertController(title: "Processing", message: "Please wait while the photo is being processed.", preferredStyle: .alert)
//create an activity indicator
let indicator = UIActivityIndicatorView(frame: activityAlertController.view.bounds)
indicator.autoresizingMask = [.flexibleWidth, .flexibleHeight]
indicator.hidesWhenStopped = true
indicator.activityIndicatorViewStyle = UIActivityIndicatorViewStyle.gray
//add the activity indicator as a subview of the alert controller's view
activityAlertController.view.addSubview(indicator)
indicator.isUserInteractionEnabled = false // required otherwise if there buttons in the UIAlertController you will not be able to press them
indicator.startAnimating()
print("start animating")
self.present(activityAlertController, animated: true, completion: nil)
}
func onButtonClick() {
self.displaySpinningGear()
DispatchQueue.main.async {
self.doProcessing() // long running function
}
if let viewController = presentingViewController {
// This block will dismiss both current and a view controller presenting current
viewController.dismiss(animated: true, completion: nil)
}
else {
// This block will dismiss only current view controller
self.dismiss(animated: true, completion: nil)
}
}
The code below kicks off the doProcessing function but the view dismisses immediately and I can tell from the console that my doProcessing function is still running. This is not right either.
function onButtonClick() {
DispatchQueue.global(qos: .background).async {
print("Processing")
self.doProcessing() // run in background
DispatchQueue.main.async {
self.displaySpinningGear()
}
}
if let viewController = presentingViewController {
// This block will dismiss both current and a view controller presenting current
viewController.dismiss(animated: true, completion: nil)
}
else {
// This block will dismiss only current view controller
self.dismiss(animated: true, completion: nil)
}
}
How do I get the background function to kick off while displaying a spinning gear and dismiss the view and alert controller when the background function is done running (not before)?
EDIT
Tried moving the code to spin the gear outside the background block as per #Honey's suggestion in the comment but to no avail. The view immediately dismisses while the process function is still processing (I can tell through print statements).
func onButtonClick() {
DispatchQueue.main.async {
self.displaySpinningGear()
}
DispatchQueue.global(qos: .background).async {
print("Processing")
self.doProcessing() // run in background
}
if let viewController = presentingViewController {
// This block will dismiss both current and a view controller presenting current
viewController.dismiss(animated: true, completion: nil)
}
else {
// This block will dismiss only current view controller
self.dismiss(animated: true, completion: nil)
}
}
Make a Callback from long running function so when it ends returns a value and catch it to disappear the alert.
Try it:
typealias DoProcessingCallback = (_ finished: Bool) -> Void
func onButtonClick() {
self.displaySpinningGear()
self.doProcessing(callback: { (finished) in
if finished {
// Here you DismissViewController
// Here you DismissAlert
}
}) // long running function
}
func doProcessing(callback: DoProcessingCallback) {
// YOUR LONG CODE....
// When you know it already finished
callback(true)
}
Hope it helps you
I had the same issue and tried a bunch of different things and this is what worked:
activityView.alpha = 0.8
DispatchQueue.global(qos: .default).async(execute: {
DispatchQueue.main.async(execute: {
self.performSegue(withIdentifier: "cropToProcessed", sender: self)
})
})
Basically I set the alpha for activity indicator to 0.0 initially and when the button is pressed I set it to 0.8 and I set it back to 0.0 in viewWillDisappear and it works
I have an alarm clock app. It has 2 VC. VC1 is a menu VC that linked with VC2. In VC2 there's setting of alarm clock. So I have troubles with getting local notifications.
For example, if I set Alarm Clock on VC2 then I move to VC1 and then go to Home Screen I will receive a notification on the top of the screen. After clicking on notification I will move to VC1 and I will get a message. But I will get an error 'Could not cast value of type 'MyApp.VC1' (0x10ee97730) to 'MyApp.VC2' (0x10ee96bd0)'. If I set Alarm Clock on VC2 then I move to Home Screen I will receive a notification on the top of the screen. After clicking on notification I will move to VC2 and I will get a message and everything will be fine.
Other problem is setting Alarm clock on VC2 and moving to VC1 without moving to Home Screen. When time will I come my app just crashing with same error 'Could not cast value of type 'MyApp.VC1' (0x10ee97730) to 'MyApp.VC2' (0x10ee96bd0)'
func application(_ application: UIApplication, didReceive notification: UILocalNotification) {
let storageController = UIAlertController(title: "Alarm", message: nil, preferredStyle: .alert)
var soundName: String = ""
var index: Int = -1
if let userInfo = notification.userInfo {
soundName = userInfo["soundName"] as! String
index = userInfo["index"] as! Int
}
playSound(soundName)
let stopOption = UIAlertAction(title: "OK", style: .default) {
(action:UIAlertAction)->Void in self.audioPlayer?.stop()
let mainVC = self.window?.visibleViewController as! MainAlarmViewController
storageController.addAction(stopOption)
(self.window?.visibleViewController as! MainAlarmViewController).present(storageController, animated: true, completion: nil)
}
Does anybody know how to resolve it?
When I getting an error I see highlight of this line:
(self.window?.visibleViewController as! MainAlarmViewController).present(storageController, animated: true, completion: nil)
Thank you so much!
P.S. Maybe is it possible to make a notification on the top of a screen with a link to VC2 when app in foreground or app in VC1?
Also sometimes I'm getting a message 'Warning: Attempt to present on whose view is not in the window hierarchy!'
Replace this line
(self.window?.visibleViewController as! MainAlarmViewController).present(storageController, animated: true, completion: nil)
with following code
if let viewController = self.window?.visibleViewController {
if viewController is MainAlarmViewController {
// view controller is MainAlarmViewController
} else {
// view controller is not MainAlarmViewController
}
viewController.present(storageController, animated: true, completion: nil)
} else {
print("Something wrong. Window can't provide visible view controller")
}
I am fairly new to Swift but I am creating a app that requires after a certain time to enter either Touch-ID or a PIN. I am checking a timer from AppDelegate.swift to see if it has expired and if it has expired I am making a call to my "BaseTableViewController" which holds my function authenticateUser. Again I am calling this from my AppDelegate.swift file by creating an instance of BaseTableViewController var baseTableVC = BaseTableViewController() and making a call if timer expired to self.baseTableVC.authenticateUser().
Anyways I am getting: Warning: Attempt to present <UIAlertController: 0x7fed5ae1dcf0> on <admin.BaseViewController: 0x7fed5ad279d0> whose view is not in the window hierarchy!
Thank you in advance for you help!
func showPasswordAlert(){
let alertController = UIAlertController(title: "Touch ID Password", message: "Please enter your password", preferredStyle: .Alert)
let defaultAction = UIAlertAction(title: "OK", style: .Cancel) {(action) -> Void in
if let textField = alertController.textFields?.first as UITextField?{
if textField.text == "hello" {
print("Authentication successfull!")
}
else{
self.showPasswordAlert()
}
}
}
alertController.addAction(defaultAction)
alertController.addTextFieldWithConfigurationHandler{(textField) -> Void in
textField.placeholder = "Password"
textField.secureTextEntry = true
}
presentViewController(alertController, animated: true, completion: nil)
}
func authenticateUser(){
let context = LAContext()
var error: NSError?
let reasonString = "Authentication is required for Admin!"
context.localizedFallbackTitle = "Enter your PIN Code"
if context.canEvaluatePolicy(LAPolicy.DeviceOwnerAuthenticationWithBiometrics, error: &error){
context.evaluatePolicy(LAPolicy.DeviceOwnerAuthenticationWithBiometrics, localizedReason: reasonString, reply: {(success, policyError) ->Void in
if success{
print("Authentication successful!")
}
else{
switch policyError!.code{
case LAError.SystemCancel.rawValue:
print("Authentication was cancelled by the system!")
case LAError.UserCancel.rawValue:
NSOperationQueue.mainQueue().addOperationWithBlock({ () -> Void in
self.showPasswordAlert()
})
print("Authentication was cancelled by the user!")
case LAError.UserFallback.rawValue:
print("User selected to enter password.")
NSOperationQueue.mainQueue().addOperationWithBlock({() -> Void in
self.showPasswordAlert()
})
default:
print("Authentication failed!")
NSOperationQueue.mainQueue().addOperationWithBlock({ () -> Void in
self.showPasswordAlert()
})
}
}
})
}
else{
print(error?.localizedDescription)
NSOperationQueue.mainQueue().addOperationWithBlock({ () -> Void in
self.showPasswordAlert()
})
}
var baseTableVC = BaseTableViewController()
func applicationWillEnterForeground(application: UIApplication) {
// Called as part of the transition from the background to the inactive state; here you can undo many of the changes made on entering the background.
let logInStatus = NSUserDefaults.standardUserDefaults()
let currentTime = NSDate().timeIntervalSince1970
let roundCurrentTime = (round(currentTime))
// Pin expire limit
let pinExpLimit: Double = 30
// Set the exact time of expire for pin
let pinExpDate = (currentTime + pinExpLimit)
let newPinExpDate = (round(pinExpDate))
if (logInStatus.doubleForKey("expPinTime") <= roundCurrentTime) {
self.baseTableVC.authenticateUser()
print("AppDelegate Pin Exp Time")
print(logInStatus.doubleForKey("expPinTime"))
//print(newPinExpDate)
print("AppDelegate Current Time")
print(roundCurrentTime)
logInStatus.setDouble(newPinExpDate, forKey: "expPinTime")
NSUserDefaults.standardUserDefaults().synchronize()
}
}
I suspect you simply create an instance of BaseTableViewController but you don't add its view to the view hierarchy before presenting the UIAlertController's instance.
If self.baseTableVC is the root view controller of your app, then a call like this
baseTableVC.presentViewController(instanceOfUIAlertController, animated: true, completion: yourCompletionBlock)
should work from within the AppDelegate.
If self.baseTableVC is not the root view controller, then or you make sure to invoke the previous command on the root VC of your app
window.rootViewController.presentViewController(instanceOfUIAlertController, animated: true, completion: yourCompletionBlock)
or make sure you embed the view of self.baseTableVC in the view hierarchy and then call
baseTableVC.presentViewController(instanceOfUIAlertController, animated: true, completion: yourCompletionBlock)
As a side note, if your alert must be displayed from anywhere in the app, then your approach is ok. If instead your alert must be displayed only from a specific screen, I would remove the timer logic from the app delegate and move it inside the presenting view controller. This would keep your app delegate clean from unnecessary code and would confine the control logic in the right place: the presenting view controller
You can't create instance of view controller just by calling default constructor, use storyboard. Correct me if I'm wrong