Song Chiwon iamchiwon

/*
Made by [egy.js](https://www.instagram.com/egy.js/);
*/

	func reactivex<I, O>(_ f: @escaping (I) -> O) -> (I) -> Observable<O> {
	return { input in
	return Observable.create { emitter in
	emitter.onNext(f(input))
	emitter.onCompleted()
	return Disposables.create()
	}
	}
	}

	func lastValue<T>(_ initValue: T) -> (T) -> T {
	var value: T = initValue
	return { newValue in
	let last = value
	value = newValue
	return last
	}
	}

	func ratioMap(_ _min: CGFloat, _ _max: CGFloat) -> (CGFloat, CGFloat) -> (CGFloat) -> CGFloat {
	return { start, end in
	{ value in
	start + (value - _min) * (end - start) / (_max - _min)
	}
	}
	}

	let screenSize = UIScreen.main.bounds.size
	let screenWidth = screenSize.width
	let screenHeight = screenSize.height

	let statusHeight: CGFloat = {
	guard #available(iOS 11.0, *), let window = UIApplication.shared.keyWindow else {
	return 0
	}
	return window.safeAreaInsets.top
	}()

	//
	// ViewController.swift
	// TableViewExample
	//
	// Created by iamchiwon on 2018. 8. 2..
	// Copyright © 2018년 ncode. All rights reserved.
	//

	import UIKit
	import RxSwift

see it on :

	//
	// Rx+Control.swift
	// ReactiveSample
	//
	// Created by iamchiwon on 2018. 8. 1..
	// Copyright © 2018년 iamchiwon. All rights reserved.
	//

	import UIKit
	import RxSwift

	import RxSwift
	import RxCocoa

	extension Reactive where Base: UIViewController {
	var viewWillAppear: ControlEvent<Void> {
	let source = methodInvoked(#selector(Base.viewWillAppear)).map { _ in }
	return ControlEvent(events: source)
	}
	var viewDidAppear: ControlEvent<Void> {
	let source = methodInvoked(#selector(Base.viewDidAppear)).map { _ in }

	@discardableResult
	func createView<T>(_ view: T,
	parent: UIView?,
	setting: ((T) -> ())? = nil,
	constraint: ((ConstraintMaker) -> ())? = nil) -> T where T: UIView {

	switch parent {
	case let stack as UIStackView:
	stack.addArrangedSubview(view)
	case let collectionCell as UICollectionViewCell:

	extension String {

	func calcHeight(for width: CGFloat, font: UIFont) -> CGFloat {

	let rect = CGSize(width: width, height: .greatestFiniteMagnitude)
	let boundingRect = self.boundingRect(with: rect, options: .usesLineFragmentOrigin, attributes: [.font: font], context: nil)
	return ceil(boundingRect.height)
	}

	func calcWidth(for height: CGFloat, font: UIFont) -> CGFloat {