how I should send data from xib to viewcontroller? - swift

Question

i have a view that is a xib, this view contains a buttons for a calculator, I did this because I need a custom keyboard for my app, my app has some views that needs this keyboard
the problem is, how I send the data from view to my view controller?
in my view controller I only has a textfield and a view with xib custom class
I use swift 4.2
custom view and textflied
this is my code from my xib
import UIKit
class keyboardView: UIView {
#IBOutlet var viewKeyboard: UIView!
var textIntroduced = ""
override init(frame: CGRect) { // for using CustomView in code
super.init(frame: frame)
custom()
}
required init?(coder aDecoder: NSCoder)
{
super.init(coder: aDecoder)
custom()
}
private func custom()
{
Bundle.main.loadNibNamed("keyboard", owner: self, options: nil)
viewKeyboard.frame = self.bounds
viewKeyboard.autoresizingMask = [.flexibleHeight,.flexibleWidth]
for view in viewKeyboard.subviews
{
view.isExclusiveTouch = true
}
addSubview(viewKeyboard)
}
#IBAction func addOne(_ sender: Any) {
textIntroduced += "1"
}
#IBAction func addTwo(_ sender: Any) {
textIntroduced += "2"
}
#IBAction func addThree(_ sender: Any) {
textIntroduced += "3"
}
#IBAction func addFour(_ sender: Any) {
textIntroduced += "4"
}
#IBAction func addFive(_ sender: Any) {
textIntroduced += "5"
}
#IBAction func addSix(_ sender: Any) {
textIntroduced += "6"
}
#IBAction func addSeven(_ sender: Any) {
textIntroduced += "7"
}
#IBAction func addEight(_ sender: Any) {
textIntroduced += "8"
}
#IBAction func addNine(_ sender: Any) {
textIntroduced += "9"
}
#IBAction func addZero(_ sender: Any) {
textIntroduced += "0"
print(textIntroduced)
}
#IBAction func removeNumber(_ sender: Any) {
textIntroduced.removeLast()
}
}
in my view controller I only has a textfield and view with custom class
i want to push any button view and the result should be written in the textfield.

Answer 1

You can use protocol to observe data changes in your xib. First of all you need to create a protocol like this.
protocol NumberCalculable: class {
func addNumber(_ number: Int)
}
Then, inside your xib file below your viewKeyboard outlet you need to create a delegate for your protocol.
weak var delegate: NumberCalculable?
Instead of doing textIntroduced += 1 you should change with this delegate?.addNumber(1) and same for other IBAction methods.
Thirdly, you need to conform your protocol in your viewController class doing
keyboardView.delegate = self inside viewDidLoad() method.
extension ViewController: NumberCalculable {
func addNumber(_ number: Int) {
// do whatever you want
}
}
Hope this helps.