How do I reference a variable (a picker view value) from one view controller in another view controller?

Question

I am trying to take these variables from one of my view controller's swift file:

 //global let choice1Box1 = drivingGear[chooseDrivingGear.selectedRow(inComponent: 0)] let choice2Box1 = drivingGear[chooseDrivenGear1.selectedRow(inComponent: 0)]

This is whats being done to the variables in the original class:

@IBAction func showResultBox1(_ sender: Any) { let choice1Box1 = self.drivingGear[self.chooseDrivingGear.selectedRow(inComponent: 0)] let choice2Box1 = self.drivingGear[self.chooseDrivenGear1.selectedRow(inComponent: 0)] if let intVal1 = Double(choice1Box1), let intVal2 = Double(choice2Box1) { result = intVal2 / intVal1 let newLabel = String(result) resultBox1.setTitle(newLabel, for: .normal) } }

You can pass data from one VC to another VC, by using Delegate and also you can use prepare(forSegue:) method. matteomanferdini.com/… — Kazi Abdullah Al Mamun
– Kazi Abdullah Al Mamun, Commented Apr 19, 2018 at 2:02

Abhirajsinh Thakore · Accepted Answer · 2018-04-20 12:12:36Z

Just do like this:

Once you have picked the value from the pickerView. Pass it like this.

For Eg. You need to pass a String to next VC:

In SecondVC: Declare a value at top like this:

var strFromPreviousVC:String = String()

In First VC: Send the Value like this:

let objSecondVC = self.storyboard?.instantiateViewController(withIdentifier: "secondVC") as! SecondVC objSecondVC.strFromPreviousVC = "your selected String here" self.navigationController?.pushViewController(objSecondVC, animated: true)

And yes its done, it will be passed to SecondVc and you can use the value like print(strFromPreviousVC) in SecondVc

Hope it helps.

@Brkr I agree with you, but delegates would be troublesome for Newbie's.
You are absolutely right. i gave positive vote for your answer.

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