How to store data from a picker view in a variable when a button is pressed?

Question

I have a picker view with one component that I populated with an array of data. When the user presses a button, I want the selected data in that row to be stored in a variable so that I can send it to another view controller using a segue, where it will be displayed in a label. The only part I'm having trouble with is actually getting that data to be stored in order to be used somewhere else. I know that using a datePicker, I can do something like this to do what I want:

@IBAction func buttonPressed(sender: AnyObject) { var chosenDate: NSDate = self.datePicker.date }

This will store the date selected by the user in the var chosenDate, which is what I want for my pickerView when a button is pressed. I'm aware also that I can get that data in a pickerView using

func pickerView(pickerView: UIPickerView, didSelectRow row: Int, inComponent component: Int)

The only problem with this is that it selects the data every single time a user changes the value, and it doesn't allow me to store the data in a variable outside the function for me to use it in my @IBAction func buttonPressed method. Thanks in advance!

user4363124 · Accepted Answer · 2015-01-05 20:37:21Z

Alright, after trying different things I finally came up with a solution to my problem. It might not be what the more experienced developers do but it worked for me just like I wanted. Here is what I did:

@IBAction func saveButtonPressed(sender: AnyObject) { var chosen = pickerView.selectedRowInComponent(0) var chosenString = arrayPopulatingThePickerView[chosen] }

I only have one component in the pickerView i need therefore when the button is pressed I store the row number of the component 0 in a variable, then I store the string in another variable by making it equal to the array I used to populate my picker view. I retrieve the row by passing it the chosen variable.

That works well, except you should use let instead of var if you don't need the data to be mutable.

Leo Dabus · Accepted Answer · 2015-01-05 07:00:55Z

You can create a function to store this date using NSUserDefaults. This way you can access it everywhere and anytime (even after closing the app).

func saveChosenDate(date:NSDate){ NSUserDefaults.standardUserDefaults().setObject(date, forKey: "chosenDate") NSUserDefaults.standardUserDefaults().synchronize() }

to load it:

func loadChosenDate()-> NSDate{ return NSUserDefaults.standardUserDefaults().objectForKey("chosenDate") as NSDate }

to delete/reset the value of it:

NSUserDefaults.standardUserDefaults().removeObjectForKey("chosenDate") NSUserDefaults.standardUserDefaults().synchronize()

save it

@IBAction func buttonPressed(sender: AnyObject) { saveChosenDate(datePicker.date) }

load it

let myDate = loadChosenDate()

Thanks for the answer, it's great when working with a datePicker, but I'm trying to work with a picker view with custom data, such as apples, oranges, grapes or 1,2,3,4,5. Please let me know if you have an idea of how I can solve this. Cheers!
I'm actually trying to do with a picker view the same thing I did with the date picker above, but you're right my question probably wasn't that clear.

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