Return value in DropDownMenu on selection? - swift

Question

I'm new to Xcode and Swift. I am using this library: https://github.com/PhamBaTho/BTNavigationDropdownMenu to create DropDownMenu in my app. I followed the demo from Github and everything works fine. I am trying to get the selected value and assign it to a string outside didSelectItemAtIndexHandler function. This is my code:
var menuView: BTNavigationDropdownMenu!
var items = ["San Francisco", "New York", "LA", "Chicago"]
menuView = BTNavigationDropdownMenu(navigationController: self.navigationController, containerView: self.navigationController!.view, title: BTTitle.index(0), items: items)
menuView.didSelectItemAtIndexHandler = {(indexPath: Int) -> Void in
self. myCity = items[indexPath]
//print(myCity) // prints the correct city every time
}
self.navigationItem.titleView = menuView
I am trying to get the following outside menuView.didSelectItemAtIndexHandler :
var test = String()
test = myCity
print(test)
Any help will be appreciated. Thanks in advance!
I am trying to pass the data from here to TopFiveViewController.
menuView.didSelectItemAtIndexHandler = {(indexPath: Int) -> Void in
let storyboard = UIStoryboard(name: "Main", bundle: Bundle.main)
let vc = storyboard.instantiateViewController(withIdentifier: "TopFiveViewController") as! TopFiveViewController
vc.myCity = self!.items[indexPath]
print(myCity) // prints the correct city every time but it doesn't pass the value to TopFiveViewController!
}
In the TopFiveViewController I have:
var myCity = String()
override func viewDidLoad() {
super.viewDidLoad()
if self.myCity == "San Francisco" {
// load SF json file
} else if myCity == "New York" {
// load NY json file
}

Answer 1

As you mentioned that everything is happening in your viewDidLoad() I think it's important to understand what is happening.
The view loads and test as well as myCity are set to nil.
When the user selects an item from the dropdown menu the code within menuView.didSelectItemAtIndexHandler will be called and myCity will now be set to the selected value although test will still be nil as the completion handler setting the value of myCity has no effect on test.
You should execute whatever code you want to execute when the value is selected within the completion handler (where self. myCity = items[indexPath] is located).