InputAccessoryView.swift

//
//  InputAccessoryView.swift
//
//  Created by Rodolfo Antonici on 23/08/16.
//  Copyright © 2016 RAntonici. All rights reserved.
//

import UIKit

class InputAccessoryView: UIView {

    private var toolbar = UIToolbar()
    private var rightBarButton: UIBarButtonItem!
    weak var textField: UITextField? {
        didSet{
            guard let textField = textField else{
                return
            }
            textField.inputAccessoryView = self
            var title = ""
            switch textField.returnKeyType {
            case .default:
                title = "Done"
            case .go:
                title = "Go"
            case .google:
                title = "Search"
            case .join:
                title = "Join"
            case .next:
                title = "Next"
            case .route:
                title = "Route"
            case .search:
                title = "Search"
            case .send:
                title = "Send"
            case .yahoo:
                title = "Search"
            case .done:
                title = "Done"
            case .emergencyCall:
                title = "Emergency Call"
            case .continue:
                title = "Done"
            }
            self.rightBarButton.title = title
            
        }
    }
    override var frame: CGRect {
        didSet {
            self.updateLayerFrames()
        }
    }
    
    convenience init(frame: CGRect, withTextField textField: UITextField) {
        self.init(frame: frame)
        self.textField = textField
    }
    
    override init(frame: CGRect) {
        super.init(frame: frame)
        self.backgroundColor = .clear
        self.toolbar.barTintColor = .darkGray
        self.toolbar.tintColor = .blue
        self.addSubview(self.toolbar)
        self.rightBarButton = UIBarButtonItem(title: "return", style: .plain, target: self, action: #selector(rightButtonDidReceiveTouchUpInside))
        let flexSpacer = UIBarButtonItem(barButtonSystemItem: .flexibleSpace, target: nil, action: nil)
        self.toolbar.items = [flexSpacer, self.rightBarButton]
        self.updateLayerFrames()
    }
    
    @objc func rightButtonDidReceiveTouchUpInside() {
        if let delegate = self.textField?.delegate {
            let _ = delegate.textFieldShouldReturn!(self.textField!)
        }
        
    }
    
    required init(coder: NSCoder) {
        super.init(coder: coder)!
    }
    
    func updateLayerFrames() {
        self.toolbar.frame = CGRect(origin: CGPoint.zero, size: self.frame.size)
    }

}