-
Notifications
You must be signed in to change notification settings - Fork 1.2k
/
ImageViewElementCell.swift
199 lines (163 loc) · 5.58 KB
/
ImageViewElementCell.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
import KsApi
import Library
import Prelude
import Prelude_UIKit
import UIKit
class ImageViewElementCell: UITableViewCell, ValueCell {
// MARK: Properties
private lazy var imageAndCaptionStackView: UIStackView = { UIStackView(frame: .zero) }()
private lazy var textView: UITextView = { UITextView(frame: .zero) }()
private lazy var storyImageView: GIFAnimatedImageView = { GIFAnimatedImageView(frame: .zero) }()
private var textViewHeightConstraint: NSLayoutConstraint?
private var imageViewAspectConstraint: NSLayoutConstraint? {
didSet {
if let oldValue = oldValue {
self.storyImageView.removeConstraint(oldValue)
}
if let newValue = imageViewAspectConstraint {
self.storyImageView.addConstraint(newValue)
}
}
}
private let viewModel = ImageViewElementCellViewModel()
private var pinchGesture: UIPinchGestureRecognizer!
private var imageAspectRatio = CGFloat.zero
weak var pinchToZoomDelegate: PinchToZoomDelegate?
// MARK: Initializers
override init(style: UITableViewCell.CellStyle, reuseIdentifier: String?) {
super.init(style: style, reuseIdentifier: reuseIdentifier)
self.configureViews()
self.setupConstraints()
self.bindStyles()
self.bindViewModel()
}
required init?(coder _: NSCoder) {
fatalError("init(coder:) has not been implemented")
}
override func prepareForReuse() {
super.prepareForReuse()
self.imageViewAspectConstraint = nil
}
func configureWith(value imageData: (element: ImageViewElement, image: UIImage?)) {
self.viewModel.inputs.configureWith(imageElement: imageData.element, image: imageData.image)
}
// MARK: View Model
internal override func bindViewModel() {
self.viewModel.outputs.attributedText
.observeForUI()
.on(event: { [weak self] _ in
self?.resetTextView()
})
.observeValues { [weak self] attributedText in
guard let viewableAttributedText = attributedText else { return }
if viewableAttributedText.length > 0 {
self?.textViewHeightConstraint?.isActive = false
}
self?.textView.attributedText = viewableAttributedText
}
self.viewModel.outputs.image
.observeForUI()
.on(event: { [weak self] _ in
self?.resetImageView()
})
.observeValues { [weak self] image in
guard let strongSelf = self,
let viewableImage = image else { return }
strongSelf.imageAspectRatio = viewableImage.size.width / viewableImage.size.height
strongSelf.imageViewAspectConstraint = NSLayoutConstraint(
item: strongSelf.storyImageView,
attribute: .width,
relatedBy: .equal,
toItem: strongSelf.storyImageView,
attribute: .height,
multiplier: strongSelf.imageAspectRatio,
constant: 0.0
)
strongSelf.storyImageView.image = viewableImage
}
}
// MARK: View Styles
internal override func bindStyles() {
super.bindStyles()
_ = self
|> baseTableViewCellStyle()
|> \.separatorInset .~
.init(
top: 0,
left: 0,
bottom: 0,
right: self.bounds.size.width + ProjectHeaderCellStyles.Layout.insets
)
_ = self.contentView
|> \.layoutMargins .~ .init(
topBottom: Styles.gridHalf(3),
leftRight: Styles.grid(3)
)
_ = self.imageAndCaptionStackView
|> \.axis .~ .vertical
|> \.spacing .~ Styles.grid(1)
_ = self.textView
|> textViewStyle
_ = self.storyImageView
|> imageViewStyle
|> \.isUserInteractionEnabled .~ true
}
// MARK: Helpers
private func resetImageView() {
if self.storyImageView.isAnimating {
self.storyImageView.stopAnimating()
self.storyImageView.image = nil
}
}
private func resetTextView() {
self.textView.attributedText = nil
self.textViewHeightConstraint?.isActive = true
}
private func configureViews() {
_ = (self.imageAndCaptionStackView, self.contentView)
|> ksr_addSubviewToParent()
|> ksr_constrainViewToMarginsInParent()
_ = ([self.storyImageView, self.textView], self.imageAndCaptionStackView)
|> ksr_addArrangedSubviewsToStackView()
self.pinchGesture = UIPinchGestureRecognizer(target: self, action: #selector(self.pinch(sender:)))
self.pinchGesture.delegate = self
self.storyImageView.addGestureRecognizer(self.pinchGesture)
}
private func setupConstraints() {
self.textViewHeightConstraint = self.textView.heightAnchor.constraint(equalToConstant: 0)
self.textViewHeightConstraint?.isActive = true
}
@objc func pinch(sender: UIPinchGestureRecognizer) {
switch sender.state {
case .began:
guard let image = self.storyImageView.image else { return }
let originWithoutParentView = self.storyImageView.convert(
self.storyImageView.frame.origin,
to: nil
)
let frameWithinWindow = CGRect(
x: originWithoutParentView.x,
y: originWithoutParentView.y,
width: self.storyImageView.frame.width,
height: self.storyImageView.frame.height
)
self.pinchToZoomDelegate?.pinchZoomDidBegin(
self.pinchGesture,
frame: frameWithinWindow,
image: image
)
case .changed:
self.pinchToZoomDelegate?.pinchZoomDidChange(self.pinchGesture) {
if !self.storyImageView.isHidden {
self.storyImageView.isHidden.toggle()
}
}
case .ended, .failed, .cancelled:
self.pinchToZoomDelegate?.pinchZoomDidEnd(self.pinchGesture) {
self.storyImageView.isHidden = false
}
default:
return
}
}
}