How to make TextField focus in SwiftUI for macOS

Issue #620

For NSWindow having levelother than .normal, need to override key and main property to allow TextField to be focusable

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class FocusWindow: NSWindow {
override var canBecomeKey: Bool { true }
override var canBecomeMain: Bool { true }
}

Furthermore to customize TextField, consider using custom

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import SwiftUI
import AppKit

struct MyTextField: NSViewRepresentable {
@Binding var text: String

func makeNSView(context: NSViewRepresentableContext<MyTextField>) -> NSTextField {
let tf = NSTextField()
tf.focusRingType = .none
tf.isBordered = false
tf.drawsBackground = false
tf.delegate = context.coordinator
return tf
}

func updateNSView(_ nsView: NSTextField, context: NSViewRepresentableContext<MyTextField>) {
nsView.stringValue = text
}

func makeCoordinator() -> MyTextField.Coordinator {
Coordinator(parent: self)
}

class Coordinator: NSObject, NSTextFieldDelegate {
let parent: MyTextField
init(parent: MyTextField) {
self.parent = parent
}

func controlTextDidChange(_ obj: Notification) {
let textField = obj.object as! NSTextField
parent.text = textField.stringValue
}
}
}
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