CODEWITHSUNDEEP
iosswiftxcode
szeto1121
szeto1121

Reputation: 13

Pop Alert if a CollectionViewCell is selected

There is a CollectionView with a couple items. I am trying to pop a alert message with textfield to create a new file when the item is selected.

However, when the last instruction (self.present(....)) is executed, an error message : "fatal error: unexpectedly found nil while unwrapping an Optional value" occurred.

I have also tried the code from : How to present an AlertView from a UICollectionViewCell but it does not work as well.

self.window?.rootViewController?.presentViewController(alert, animated: true, completion: nil)

Is it possible to do that? How can I solve this problem? Thanks.

func addFile(){    
let alert = UIAlertController(title: "New file name:", message: "", preferredStyle: .alert)
    alert.addTextField{
        (textField: UITextField!) -> Void in
        textField.placeholder=""
    }
    let cancelAction = UIAlertAction(title: "Cancel",style: .cancel, handler: nil)
    alert.addAction(cancelAction)
    let createAction = UIAlertAction(title: "Create" ,style: .default){
        (action:UIAlertAction!) -> Void in
        let fileName = (alert.textFields?.first)! as UITextField
        print(fileName.text)
    }
    alert.addAction(createAction)
    self.present(alert, animated: true, completion: nil)
}

EDIT: solved.

i modified the last line to UIApplication.shared.keyWindow?.rootViewController?.presentedViewController?.present(alert,animated: true, completion: nil) and the alert box pop finally.

Upvotes: 0

Views: 454

Answers (3)

ankis
ankis

Reputation: 1

Replace only the part with createAction

let createAction = UIAlertAction(title: "Create" ,style: .default){
     (action:UIAlertAction!) -> Void in
     guard let textField = alert.textFields?.first,
         let fileName = textField.text else { return }
         print(fileName)
}
alert.addAction(createAction)

Upvotes: 0

Leang Socheat
Leang Socheat

Reputation: 1174

I recommend you to use delegate. and I will demo some code to you. first create prototype

protocol AlertViewDelegate {
      func alertSending(sender: UIAlertController)
}

than you implement in uicollectionviewcell class by 

var delegate: AlertViewDelegate?
func actionMethod() { 
     let alert = UIAlertController(title: "New file name:", message: "", preferredStyle: .alert)
     alert.addTextField{
    (textField: UITextField!) -> Void in
     textField.placeholder=""
}
     let cancelAction = UIAlertAction(title: "Cancel",style: .cancel, handler: nil)
     alert.addAction(cancelAction)
     let createAction = UIAlertAction(title: "Create" ,style: .default){
    (action:UIAlertAction!) -> Void in
        let fileName = (alert.textFields?.first)! as UITextField
        print(fileName.text)
     }
     alert.addAction(createAction)
     delegate?.alertSending(sender: alert)
}

finally you go to your uicollectionviewcontroller class than extends delegate 

extension ViewCollectionViewController: AlertViewDelegate {
func alertSending(sender: UIAlertController) {
    self.present(sender, animated: true, completion: nil)        
}

question please comment. hope it works for you. enjoy!

Upvotes: 2

nayem
nayem

Reputation: 7605

You have problems in these two lines:

let fileName = (alert.textFields?.first)! as UITextField
print(fileName.text)

Change them to these lines:

let fileName = alert.textFields?.first?.text
print(fileName!)

Upvotes: 0

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