|
| 1 | +// |
| 2 | +// ViewController.swift |
| 3 | +// Demo |
| 4 | +// |
| 5 | +// Created by Suyeol Jeon on 09/10/2016. |
| 6 | +// Copyright © 2016 Suyeol Jeon. All rights reserved. |
| 7 | +// |
| 8 | + |
| 9 | +import UIKit |
| 10 | + |
| 11 | +import RxKeyboard |
| 12 | +import RxSwift |
| 13 | + |
| 14 | +class ViewController: UIViewController { |
| 15 | + |
| 16 | + let textView = UITextView().then { |
| 17 | + $0.font = UIFont.systemFont(ofSize: UIFont.systemFontSize) |
| 18 | + $0.placeholder = "Scroll down to dismiss keyboard." |
| 19 | + $0.isEditable = true |
| 20 | + $0.alwaysBounceVertical = true |
| 21 | + $0.keyboardDismissMode = .interactive |
| 22 | + $0.translatesAutoresizingMaskIntoConstraints = false |
| 23 | + } |
| 24 | + let toolbar = UIToolbar().then { |
| 25 | + $0.translatesAutoresizingMaskIntoConstraints = false |
| 26 | + } |
| 27 | + var toolbarBottomConstraint: NSLayoutConstraint? |
| 28 | + let labelItem = UIBarButtonItem(title: nil, style: .plain, target: nil, action: nil).then { |
| 29 | + $0.isEnabled = false |
| 30 | + } |
| 31 | + let doneButtonItem = UIBarButtonItem(barButtonSystemItem: .done, target: nil, action: nil) |
| 32 | + |
| 33 | + let disposeBag = DisposeBag() |
| 34 | + |
| 35 | + init() { |
| 36 | + super.init(nibName: nil, bundle: nil) |
| 37 | + self.title = "RxKeyboard Demo" |
| 38 | + |
| 39 | + self.toolbar.items = [ |
| 40 | + UIBarButtonItem(image: self.makeUpArrowImage(), style: .plain, target: nil, action: nil) |
| 41 | + .then { $0.isEnabled = false }, |
| 42 | + UIBarButtonItem(image: self.makeDownArrowImage(), style: .plain, target: nil, action: nil) |
| 43 | + .then { $0.isEnabled = false }, |
| 44 | + UIBarButtonItem(barButtonSystemItem: .flexibleSpace, target: nil, action: nil), |
| 45 | + self.labelItem, |
| 46 | + UIBarButtonItem(barButtonSystemItem: .flexibleSpace, target: nil, action: nil), |
| 47 | + self.doneButtonItem, |
| 48 | + ] |
| 49 | + } |
| 50 | + |
| 51 | + required init?(coder aDecoder: NSCoder) { |
| 52 | + fatalError("init(coder:) has not been implemented") |
| 53 | + } |
| 54 | + |
| 55 | + override func viewDidLoad() { |
| 56 | + super.viewDidLoad() |
| 57 | + self.textView.becomeFirstResponder() |
| 58 | + self.view.addSubview(self.textView) |
| 59 | + self.view.addSubview(self.toolbar) |
| 60 | + self.setupConstraints() |
| 61 | + |
| 62 | + RxKeyboard.instance.visibleHeight |
| 63 | + .drive(onNext: { [weak self] keyboardVisibleHeight in |
| 64 | + self?.toolbarBottomConstraint?.constant = -keyboardVisibleHeight |
| 65 | + self?.view.setNeedsLayout() |
| 66 | + UIView.animate(withDuration: 0) { |
| 67 | + self?.view.layoutIfNeeded() |
| 68 | + } |
| 69 | + }) |
| 70 | + .addDisposableTo(self.disposeBag) |
| 71 | + |
| 72 | + RxKeyboard.instance.visibleHeight |
| 73 | + .drive(onNext: { [weak self] in |
| 74 | + self?.labelItem.title = "height: \($0)" |
| 75 | + }) |
| 76 | + .addDisposableTo(self.disposeBag) |
| 77 | + |
| 78 | + self.doneButtonItem.rx.tap |
| 79 | + .subscribe(onNext: { [weak self] in |
| 80 | + self?.textView.resignFirstResponder() |
| 81 | + }) |
| 82 | + .addDisposableTo(self.disposeBag) |
| 83 | + } |
| 84 | + |
| 85 | + |
| 86 | + // MARK: Auto Layout |
| 87 | + |
| 88 | + private func setupConstraints() { |
| 89 | + // text view |
| 90 | + NSLayoutConstraint.activate([ |
| 91 | + NSLayoutConstraint( |
| 92 | + item: self.textView, |
| 93 | + attribute: .width, |
| 94 | + relatedBy: .equal, |
| 95 | + toItem: self.view, |
| 96 | + attribute: .width, |
| 97 | + multiplier: 1, |
| 98 | + constant: 0 |
| 99 | + ), |
| 100 | + NSLayoutConstraint( |
| 101 | + item: self.textView, |
| 102 | + attribute: .height, |
| 103 | + relatedBy: .equal, |
| 104 | + toItem: self.view, |
| 105 | + attribute: .height, |
| 106 | + multiplier: 1, |
| 107 | + constant: 0 |
| 108 | + ), |
| 109 | + ]) |
| 110 | + |
| 111 | + // toolbar |
| 112 | + self.toolbarBottomConstraint = NSLayoutConstraint( |
| 113 | + item: self.toolbar, |
| 114 | + attribute: .bottom, |
| 115 | + relatedBy: .equal, |
| 116 | + toItem: self.view, |
| 117 | + attribute: .bottom, |
| 118 | + multiplier: 1, |
| 119 | + constant: 0 |
| 120 | + ) |
| 121 | + guard let toolbarBottomConstraint = self.toolbarBottomConstraint else { return } |
| 122 | + NSLayoutConstraint.activate([ |
| 123 | + NSLayoutConstraint( |
| 124 | + item: self.toolbar, |
| 125 | + attribute: .width, |
| 126 | + relatedBy: .equal, |
| 127 | + toItem: self.view, |
| 128 | + attribute: .width, |
| 129 | + multiplier: 1, |
| 130 | + constant: 0 |
| 131 | + ), |
| 132 | + NSLayoutConstraint( |
| 133 | + item: self.toolbar, |
| 134 | + attribute: .height, |
| 135 | + relatedBy: .equal, |
| 136 | + toItem: nil, |
| 137 | + attribute: .notAnAttribute, |
| 138 | + multiplier: 1, |
| 139 | + constant: 44 |
| 140 | + ), |
| 141 | + toolbarBottomConstraint, |
| 142 | + ]) |
| 143 | + } |
| 144 | + |
| 145 | + |
| 146 | + // MARK: Image Factory |
| 147 | + |
| 148 | + private func makeUpArrowImage() -> UIImage? { |
| 149 | + let size = CGSize(width: 21, height: 12) |
| 150 | + let lineWidth: CGFloat = 1.5 |
| 151 | + UIGraphicsBeginImageContextWithOptions(size, false, 0) |
| 152 | + |
| 153 | + guard let context = UIGraphicsGetCurrentContext() else { return nil } |
| 154 | + context.move(to: CGPoint(x: lineWidth / 2, y: size.height - lineWidth / 2)) |
| 155 | + context.addLine(to: CGPoint(x: size.width / 2, y: lineWidth / 2)) |
| 156 | + context.addLine(to: CGPoint(x: size.width - lineWidth / 2, y: size.height - lineWidth / 2)) |
| 157 | + context.setLineWidth(lineWidth) |
| 158 | + |
| 159 | + UIColor.black.setStroke() |
| 160 | + context.strokePath() |
| 161 | + |
| 162 | + let image = UIGraphicsGetImageFromCurrentImageContext() |
| 163 | + UIGraphicsEndImageContext() |
| 164 | + return image |
| 165 | + } |
| 166 | + |
| 167 | + private func makeDownArrowImage() -> UIImage? { |
| 168 | + let size = CGSize(width: 21, height: 12) |
| 169 | + let lineWidth: CGFloat = 1.5 |
| 170 | + UIGraphicsBeginImageContextWithOptions(size, false, 0) |
| 171 | + |
| 172 | + guard let context = UIGraphicsGetCurrentContext() else { return nil } |
| 173 | + context.move(to: CGPoint(x: lineWidth / 2, y: lineWidth / 2)) |
| 174 | + context.addLine(to: CGPoint(x: size.width / 2, y: size.height - lineWidth / 2)) |
| 175 | + context.addLine(to: CGPoint(x: size.width - lineWidth / 2, y: lineWidth / 2)) |
| 176 | + context.setLineWidth(lineWidth) |
| 177 | + |
| 178 | + UIColor.black.setStroke() |
| 179 | + context.strokePath() |
| 180 | + |
| 181 | + let image = UIGraphicsGetImageFromCurrentImageContext() |
| 182 | + UIGraphicsEndImageContext() |
| 183 | + return image |
| 184 | + } |
| 185 | + |
| 186 | +} |
0 commit comments