1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
|
//
// AccountInputGroupView.swift
// MullvadVPN
//
// Created by pronebird on 22/03/2019.
// Copyright © 2019 Mullvad VPN AB. All rights reserved.
//
import UIKit
@IBDesignable class AccountInputGroupView: UIView {
@IBOutlet var textField: UITextField!
enum Style {
case normal, error, authenticating
}
var loginState = LoginState.default {
didSet {
updateAppearance()
updateTextFieldEnabled()
}
}
private let borderRadius = CGFloat(8)
private let borderWidth = CGFloat(2)
private var borderColor: UIColor {
switch loginState {
case .default:
return textField.isEditing
? UIColor.AccountTextField.NormalState.borderColor
: UIColor.clear
case .failure:
return UIColor.AccountTextField.ErrorState.borderColor
case .authenticating, .success:
return UIColor.AccountTextField.AuthenticatingState.borderColor
}
}
private var textColor: UIColor {
switch loginState {
case .default:
return UIColor.AccountTextField.NormalState.textColor
case .failure:
return UIColor.AccountTextField.ErrorState.textColor
case .authenticating, .success:
return UIColor.AccountTextField.AuthenticatingState.textColor
}
}
private var backgroundLayerColor: UIColor {
switch loginState {
case .default:
return UIColor.AccountTextField.NormalState.backgroundColor
case .failure:
return UIColor.AccountTextField.ErrorState.backgroundColor
case .authenticating, .success:
return UIColor.AccountTextField.AuthenticatingState.backgroundColor
}
}
private let borderLayer = CAShapeLayer()
private let backgroundLayer = CAShapeLayer()
private let maskLayer = CALayer()
// MARK: - View lifecycle
override func awakeFromNib() {
super.awakeFromNib()
setup()
}
// MARK: - CALayerDelegate
override func layoutSublayers(of layer: CALayer) {
super.layoutSublayers(of: layer)
guard layer == self.layer else { return }
// extend the border frame outside of the content area
let borderFrame = layer.bounds.insetBy(dx: -borderWidth * 0.5, dy: -borderWidth * 0.5)
// create a bezier path for border
let borderPath = borderBezierPath(size: borderFrame.size)
// update the background layer mask
maskLayer.frame.size = borderFrame.size
maskLayer.contents = backgroundMaskImage(borderPath: borderPath).cgImage
backgroundLayer.frame = borderFrame
borderLayer.path = borderPath.cgPath
borderLayer.frame = borderFrame
}
// MARK: - Notifications
@objc func textDidBeginEditing() {
updateAppearance()
}
@objc func textDidEndEditing() {
updateAppearance()
}
// MARK: - Private
private func setup() {
backgroundColor = UIColor.clear
borderLayer.lineWidth = borderWidth
borderLayer.fillColor = UIColor.clear.cgColor
backgroundLayer.mask = maskLayer
layer.insertSublayer(borderLayer, at: 0)
layer.insertSublayer(backgroundLayer, at: 0)
updateAppearance()
updateTextFieldEnabled()
addTextFieldNotificationObservers()
}
private func addTextFieldNotificationObservers() {
let notificationCenter = NotificationCenter.default
notificationCenter.addObserver(self,
selector: #selector(textDidBeginEditing),
name: UITextField.textDidBeginEditingNotification,
object: textField)
notificationCenter.addObserver(self,
selector: #selector(textDidEndEditing),
name: UITextField.textDidEndEditingNotification,
object: textField)
}
private func updateAppearance() {
borderLayer.strokeColor = borderColor.cgColor
backgroundLayer.backgroundColor = backgroundLayerColor.cgColor
textField.textColor = textColor
}
private func updateTextFieldEnabled() {
switch loginState {
case .authenticating, .success:
textField.isEnabled = false
default:
textField.isEnabled = true
}
}
private func borderBezierPath(size: CGSize) -> UIBezierPath {
let borderPath = UIBezierPath(roundedRect: CGRect(origin: .zero, size: size), cornerRadius: borderRadius)
borderPath.lineWidth = borderWidth
return borderPath
}
private func backgroundMaskImage(borderPath: UIBezierPath) -> UIImage {
let renderer = UIGraphicsImageRenderer(bounds: borderPath.bounds)
return renderer.image { (ctx) in
borderPath.fill()
// strip out any overlapping pixels between the border and the background
borderPath.stroke(with: .clear, alpha: 0)
}
}
}
|
