How does iOS Custom Keyboard buttons action triggered? - swift

Question

I am trying to make custom keyboard extension. Keyboard buttons showing nicely but no action triggered! Here is Buttons UI:
struct MyKeyButtons: View {
let data: [String] = ["A", "B", "C"]
var body: some View {
HStack {
ForEach(data, id: \.self) { aData in
Button(action: {
KeyboardViewController().keyPressed()
}) {
Text(aData)
.fontWeight(.bold)
.font(.title)
.foregroundColor(.purple)
.padding()
.border(Color.purple, width: 5)
}
}
}
}
}
The KeyboardViewController code here:
import SwiftUI
class KeyboardViewController: UIInputViewController {
#IBOutlet var nextKeyboardButton: UIButton!
override func updateViewConstraints() {
super.updateViewConstraints()
// Add custom view sizing constraints here
}
override func viewDidLoad() {
super.viewDidLoad()
let child = UIHostingController(rootView: MyKeyButtons())
//that's wrong, it must be true to make flexible constraints work
// child.translatesAutoresizingMaskIntoConstraints = false
child.view.autoresizingMask = [.flexibleWidth, .flexibleHeight]
view.addSubview(child.view)
addChild(child)//not sure what is this for, it works without it.
// Perform custom UI setup here
self.nextKeyboardButton = UIButton(type: .system)
self.nextKeyboardButton.setTitle(NSLocalizedString("Next Keyboard", comment: "Title for 'Next Keyboard' button"), for: [])
self.nextKeyboardButton.sizeToFit()
self.nextKeyboardButton.translatesAutoresizingMaskIntoConstraints = false
self.nextKeyboardButton.addTarget(self, action: #selector(handleInputModeList(from:with:)), for: .allTouchEvents)
self.view.addSubview(self.nextKeyboardButton)
self.nextKeyboardButton.leftAnchor.constraint(equalTo: self.view.leftAnchor).isActive = true
self.nextKeyboardButton.bottomAnchor.constraint(equalTo: self.view.bottomAnchor).isActive = true
}
override func viewWillLayoutSubviews() {
self.nextKeyboardButton.isHidden = !self.needsInputModeSwitchKey
super.viewWillLayoutSubviews()
}
override func textWillChange(_ textInput: UITextInput?) {
// The app is about to change the document's contents. Perform any preparation here.
}
override func textDidChange(_ textInput: UITextInput?) {
// The app has just changed the document's contents, the document context has been updated.
var textColor: UIColor
let proxy = self.textDocumentProxy
if proxy.keyboardAppearance == UIKeyboardAppearance.dark {
textColor = UIColor.white
} else {
textColor = UIColor.black
}
self.nextKeyboardButton.setTitleColor(textColor, for: [])
}
//==================================
func keyPressed() {
print("test--- clicked! ")
//textDocumentProxy.insertText("a")
(textDocumentProxy as UIKeyInput).insertText("a")
}
}
For more info see the GitHub project: https://github.com/ask2asim/KeyboardTest1