CODEWITHSUNDEEP
iosswift
S.Verma
S.Verma

Reputation: 199

How to move data in VC using Delegates?

How can I move the data stored in data into the next VC and append it in my list when the sendDate is tapped ? Here is my code of the sending class :

protocol DataSentDelegate{
     func userDidEnterData(data: String)
}
class SecondViewController: UIViewController{

var delegate: DataSentDelegate!

@IBAction func addItem(_ sender: Any)
{
    let data = textField.text
    delegate?.userDidEnterData(data: data)
}

Here is the code of recieving class :

class SecondPageViewController: UIViewController, DataSentDelegate{

func userDidEnterData(data: String) {

}

@IBAction func sendDate(_ sender: UIDatePicker) {

}

How do I implement list.append(data!) where data holds the value of textField.text

Upvotes: 0

Views: 79

Answers (3)

Onur Tuna
Onur Tuna

Reputation: 1060

You can share data through whole project using Singleton Pattern.

A singleton class is initialised for only once.

Look at these answers:

Swift - set delegate for singleton

Upvotes: 1

Cliff
Cliff

Reputation: 345

Do you not have to set the delegate in SecondPageViewController to self (normally in ViewDidLoad?

You declared it but don't seem to have assigned it.

Upvotes: 1

Au Ris
Au Ris

Reputation: 4669

What about you just add an array variable in your SecondPageViewController which will hold a list of strings, then append a new string each time sendDate delegate method gets called?

A few other remarks, there is no need to declare your delegate var as implicitly unwrapped if you're using optional chaining anyway, just declare it as an optional. Secondly, because SecondPageViewController is a class, it's better to make your delegate protocol class bound as such: protocol DataSentDelegate: class { func userDidEnterData(data: String) }, thirdly to avoid possible strong reference cycles make your delegate var a weak one.

Upvotes: 0

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