-
Notifications
You must be signed in to change notification settings - Fork 1
/
DPLegendView.swift
219 lines (183 loc) · 6.57 KB
/
DPLegendView.swift
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
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
//
// DPLegendView.swift
// DPCharts
//
// Created by Daniele Pantaleone
// - Github: https://github.com/danielepantaleone
// - LinkedIn: https://www.linkedin.com/in/danielepantaleone
//
// Copyright © 2023 Daniele Pantaleone. Licensed under MIT License.
//
import Foundation
import UIKit
/// Chart legend that draws according with a provided datasource.
@IBDesignable
open class DPLegendView: UIView {
// MARK: - Spacing properties
/// The bottom spacing (default = `0`).
@IBInspectable
open var bottomSpacing: CGFloat {
get { insets.bottom }
set { insets = UIEdgeInsets(top: insets.top, left: insets.left, bottom: newValue, right: insets.right) }
}
/// The left spacing (default = `0`).
@IBInspectable
open var leftSpacing: CGFloat {
get { insets.left }
set { insets = UIEdgeInsets(top: insets.top, left: newValue, bottom: insets.bottom, right: insets.right) }
}
/// The right spacing (default = `0`).
@IBInspectable
open var rightSpacing: CGFloat {
get { insets.right }
set { insets = UIEdgeInsets(top: insets.top, left: insets.left, bottom: insets.bottom, right: newValue) }
}
/// The top spacing (default = `0`).
@IBInspectable
open var topSpacing: CGFloat {
get { insets.top }
set { insets = UIEdgeInsets(top: newValue, left: insets.left, bottom: insets.bottom, right: insets.right) }
}
/// The spacing between the shape and the title of every legend item (default = `4.0`).
@IBInspectable
open var itemsSpacing: CGFloat = 4.0 {
didSet {
setNeedsLayout()
}
}
/// The spacing between items in the view (default = `4.0`).
@IBInspectable
open var spacing: CGFloat = 4.0 {
didSet {
setNeedsLayout()
}
}
/// The internal insets of the legend view.
open var insets: UIEdgeInsets = .zero {
didSet {
setNeedsLayout()
}
}
// MARK: - Layout properties
/// Whether to layout legend items horizontally (default = `false`).
@IBInspectable
open var horizontal: Bool = false {
didSet {
setNeedsLayout()
}
}
// MARK: - Shape properties
/// The size of the shapein every legend item (default = `10.0`).
@IBInspectable
open var shapeSize: CGFloat = 10.0 {
didSet {
setNeedsLayout()
}
}
// MARK: - Text properties
/// The color of the title in every legend item (default = `.lightGray`).
@IBInspectable
open var textColor: UIColor = .lightGray {
didSet {
setNeedsLayout()
}
}
/// The font of the title in every legend item (default = `.systemFont(ofSize: 12, weight: .regular)`).
open var textFont: UIFont = .systemFont(ofSize: 12, weight: .regular) {
didSet {
setNeedsLayout()
}
}
// MARK: - Public weak properties
/// Reference to the legend view datasource.
open weak var datasource: (any DPLegendViewDataSource)? {
didSet {
setNeedsLayout()
}
}
// MARK: - Private properties
var numberOfLegendItems: Int = 0
var legendItemLayers: [DPLegendItemLayer] = []
// MARK: - Lifecycle
public override func layoutSubviews() {
super.layoutSubviews()
initLegendItemsIfNeeded()
layoutLegendItems()
invalidateIntrinsicContentSize()
}
// MARK: - Initialization
func initLegendItemsIfNeeded() {
guard let datasource else {
return
}
let numberOfLegendItemsChanged = datasource.numberOfItems(self) != numberOfLegendItems
let numberOfLegendItemsInvalidated = datasource.numberOfItems(self) != legendItemLayers.count
if numberOfLegendItemsChanged || numberOfLegendItemsInvalidated {
initLegendItems()
}
}
func initLegendItems() {
guard let datasource else {
return
}
numberOfLegendItems = datasource.numberOfItems(self)
legendItemLayers.forEach { $0.removeFromSuperlayer() }
legendItemLayers.removeAll()
for _ in 0..<numberOfLegendItems {
let legendItemLayer = DPLegendItemLayer()
legendItemLayers.append(legendItemLayer)
layer.addSublayer(legendItemLayer)
}
}
// MARK: - Interface
/// Reload legend content by reading its datasource.
open func reloadData() {
setNeedsLayout()
}
// MARK: - Layout
func layoutLegendItems() {
guard let datasource else {
return
}
var acc: CGFloat = 0.0
for i in 0..<numberOfLegendItems {
let legendItemLayer = legendItemLayers[i]
legendItemLayer.shapeSize = shapeSize
legendItemLayer.shapeType = datasource.legendView(self, shapeTypeForItemAtIndex: i)
legendItemLayer.shapeColor = datasource.legendView(self, shapeColorForItemAtIndex: i)
legendItemLayer.titleFont = textFont
legendItemLayer.titleColor = textColor
legendItemLayer.title = datasource.legendView(self, titleForItemAtIndex: i)
legendItemLayer.spacing = itemsSpacing
if horizontal {
legendItemLayer.frame = CGRect(origin: CGPoint(x: acc, y: 0), size: legendItemLayer.size)
acc += legendItemLayer.frame.width
} else {
legendItemLayer.frame = CGRect(origin: CGPoint(x: 0, y: acc), size: legendItemLayer.size)
acc += legendItemLayer.frame.height
}
acc += spacing
legendItemLayer.setNeedsLayout()
}
}
// MARK: - Storyboard
#if TARGET_INTERFACE_BUILDER
let ibDataSource = DPLegendViewIBDataSource()
// swiftlint:disable:next overridden_super_call
public override func prepareForInterfaceBuilder() {
datasource = ibDataSource
}
#endif
// MARK: - Overrides
public override var intrinsicContentSize: CGSize {
if horizontal {
let height: CGFloat = legendItemLayers.map { $0.frame.height }.max() ?? 0.0
let width: CGFloat = legendItemLayers.last?.frame.maxX ?? 0.0
return CGSize(width: width, height: height)
} else {
let height: CGFloat = legendItemLayers.last?.frame.maxY ?? 0.0
let width: CGFloat = legendItemLayers.map { $0.frame.width }.max() ?? 0.0
return CGSize(width: width, height: height)
}
}
}