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
178
179
180
181
182
183
184
185
186
187
188
189
190
|
//
// CustomButton.swift
// MullvadVPN
//
// Created by pronebird on 23/05/2019.
// Copyright © 2019 Mullvad VPN AB. All rights reserved.
//
import UIKit
enum ButtonImageAlignment {
/// Align image at the left edge of the title label
case left
/// Align image at the right edge of the title label
case right
/// Align image at the leading edge of the title label
case leading
/// Align image at the trailing edge of the title label
case trailing
/// Align image at the leading edge of content area
case leadingFixed
/// Align image at the trailing edge of the content area
case trailingFixed
/// Align image at the left edge of the content area
case leftFixed
/// Align image at the right edge of the content area
case rightFixed
}
extension UIControl.State {
var customButtonTitleColor: UIColor? {
switch self {
case .normal:
return UIColor.AppButton.normalTitleColor
case .disabled:
return UIColor.AppButton.disabledTitleColor.withAlphaComponent(0.5)
case .highlighted:
return UIColor.AppButton.highlightedTitleColor
default:
return nil
}
}
}
/// A custom `UIButton` subclass that implements additional layouts for the image
class CustomButton: UIButton {
var imageAlignment: ButtonImageAlignment = .leading {
didSet {
invalidateIntrinsicContentSize()
}
}
var inlineImageSpacing: CGFloat = 4 {
didSet {
invalidateIntrinsicContentSize()
}
}
override var intrinsicContentSize: CGSize {
var intrinsicSize = super.intrinsicContentSize
// Add spacing between the image and title label in intrinsic size calculation
if let imageSize = currentImage?.size, imageSize.width > 0 {
intrinsicSize.width += inlineImageSpacing
}
return intrinsicSize
}
var effectiveImageAlignment: ButtonImageAlignment {
switch (imageAlignment, effectiveUserInterfaceLayoutDirection) {
case (.left, _),
(.leading, .leftToRight),
(.trailing, .rightToLeft):
return .left
case (.right, _),
(.trailing, .leftToRight),
(.leading, .rightToLeft):
return .right
case (.leftFixed, _),
(.leadingFixed, .leftToRight),
(.trailingFixed, .rightToLeft):
return .leftFixed
case (.rightFixed, _),
(.trailingFixed, .leftToRight),
(.leadingFixed, .rightToLeft):
return .rightFixed
default:
fatalError()
}
}
override init(frame: CGRect) {
super.init(frame: frame)
commonInit()
}
required init?(coder: NSCoder) {
super.init(coder: coder)
commonInit()
}
private func commonInit() {
// Align the text color with the tint color which is applied to the image view
if let imageTintColor = UIControl.State.normal.customButtonTitleColor {
tintColor = imageTintColor
}
}
private func computeLayout(forContentRect contentRect: CGRect) -> (CGRect, CGRect) {
var imageRect = super.imageRect(forContentRect: contentRect)
var titleRect = super.titleRect(forContentRect: contentRect)
switch (effectiveContentHorizontalAlignment, effectiveImageAlignment) {
case (.left, .left):
imageRect.origin.x = contentRect.minX
titleRect.origin.x = imageRect.width > 0
? imageRect.maxX + inlineImageSpacing
: contentRect.minX
case (.left, .right):
titleRect.origin.x = contentRect.minX
imageRect.origin.x = titleRect.maxX + inlineImageSpacing
case (.left, .leftFixed):
imageRect.origin.x = contentRect.minX
titleRect.origin.x = imageRect.width > 0
? imageRect.maxX + inlineImageSpacing
: contentRect.minX
case (.left, .rightFixed):
imageRect.origin.x = contentRect.maxX - imageRect.width
titleRect.origin.x = contentRect.minX
case (.center, .leftFixed):
imageRect.origin.x = contentRect.minX
titleRect.origin.x = contentRect.midX - titleRect.width * 0.5
case (.center, .rightFixed):
imageRect.origin.x = contentRect.maxX - imageRect.width
titleRect.origin.x = contentRect.midX - titleRect.width * 0.5
case (.center, .left):
titleRect.origin.x = contentRect.midX - titleRect.width * 0.5
imageRect.origin.x = titleRect.minX - inlineImageSpacing - imageRect.width
case (.center, .right):
titleRect.origin.x = contentRect.midX - titleRect.width * 0.5
imageRect.origin.x = titleRect.maxX + inlineImageSpacing
case (.right, .left):
titleRect.origin.x = contentRect.maxX - titleRect.width
imageRect.origin.x = titleRect.minX - imageRect.width - inlineImageSpacing
case (.right, .leftFixed):
imageRect.origin.x = contentRect.minX
titleRect.origin.x = contentRect.maxX - titleRect.width
case (.right, .rightFixed):
imageRect.origin.x = contentRect.maxX - imageRect.width
titleRect.origin.x = imageRect.width > 0
? imageRect.minX - inlineImageSpacing - titleRect.width
: contentRect.maxX - titleRect.width
default:
fatalError()
}
return (titleRect, imageRect)
}
override func imageRect(forContentRect contentRect: CGRect) -> CGRect {
computeLayout(forContentRect: contentRect).1
}
override func titleRect(forContentRect contentRect: CGRect) -> CGRect {
computeLayout(forContentRect: contentRect).0
}
}
|
