-
Notifications
You must be signed in to change notification settings - Fork 0
/
ComicsCollectionViewController.swift
332 lines (280 loc) · 11.2 KB
/
ComicsCollectionViewController.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
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
import Combine
import UIKit
class ComicsCollectionViewController: UIViewController {
// MARK: - Properties
private let viewModel = ComicsViewModel()
private var count: Int = 0
private var cancellables: Set<AnyCancellable> = []
// MARK: - UI Properties
private let logo = UIImageView()
private let searchController = UISearchController(searchResultsController: nil)
private static let compositionalLayout = UICollectionViewCompositionalLayout(
sectionProvider: {
_, environment -> NSCollectionLayoutSection? in
let margin: CGFloat = 10
let padding: CGFloat = 10
let cellMinWidth: CGFloat = 145
let cellRatio: CGFloat = 1.6
let cellWidth = {
let h = environment.container.effectiveContentSize.height
let contentWidth = environment.container.effectiveContentSize.width - (2 * margin)
let count = floor(contentWidth / cellMinWidth)
let innerSpacing = (count - 1) * padding
return (contentWidth - innerSpacing) / count
}()
let cellHeight = cellWidth * cellRatio
let cellMaxCountInRow = environment.container.effectiveContentSize.width / cellWidth
let itemSize = NSCollectionLayoutSize(
widthDimension: .absolute(cellWidth),
heightDimension: .fractionalHeight(1)
)
let item = NSCollectionLayoutItem(layoutSize: itemSize)
let groupSize = NSCollectionLayoutSize(
widthDimension: .fractionalWidth(1),
heightDimension: .absolute(cellHeight)
)
let group = NSCollectionLayoutGroup.horizontal(
layoutSize: groupSize,
subitems: [item]
)
group.interItemSpacing = .fixed(padding)
let section = NSCollectionLayoutSection(group: group)
section.interGroupSpacing = padding
section.contentInsets = .init(
top: margin,
leading: margin,
bottom: margin,
trailing: margin
)
return section
}
)
private let collectionView = UICollectionView(frame: .zero, collectionViewLayout: compositionalLayout)
private let loadingView = UILabel()
private let noResultsView = UILabel()
private let errorStackView = UIStackView()
private let errorHeaderLabel = UILabel()
private let errorDescriptionLabel = UILabel()
// MARK: - Lifecycle Methods
override func viewDidLoad() {
super.viewDidLoad()
setupViews()
setupConstraints()
setupViewModel()
viewModel.search("", offset: 0)
}
}
// MARK: - UI Setup
extension ComicsCollectionViewController {
private func setupViews() {
// Logo
logo.contentMode = .scaleAspectFit
logo.image = #imageLiteral(resourceName: "Logo")
navigationItem.titleView = logo
// Search Controller
searchController.searchResultsUpdater = self
searchController.obscuresBackgroundDuringPresentation = false
searchController.searchBar.placeholder = "Search Comics"
navigationItem.searchController = searchController
definesPresentationContext = true
// Collection View
collectionView.backgroundColor = .systemBackground
collectionView.register(
ComicsCollectionViewCell.self,
forCellWithReuseIdentifier: ComicsCollectionViewCell.cellIdentifier
)
collectionView.register(
ComicsCollectionViewLoadingMoreCell.self,
forCellWithReuseIdentifier: ComicsCollectionViewLoadingMoreCell.cellIdentifier
)
collectionView.delegate = self
collectionView.dataSource = self
collectionView.translatesAutoresizingMaskIntoConstraints = false
// Refresh Control
let refreshControl = UIRefreshControl()
refreshControl.addTarget(self, action: #selector(refreshAction), for: .valueChanged)
collectionView.refreshControl = refreshControl
// Loading View
loadingView.text = "Loading..."
loadingView.font = .marvelRegular(ofSize: 34)
loadingView.textAlignment = .center
loadingView.textColor = .marvelLabelText
loadingView.isHidden = true
loadingView.translatesAutoresizingMaskIntoConstraints = false
// No Results View
noResultsView.numberOfLines = 0
noResultsView.text = """
Ooops... No Results.
Try Another Name...
"""
noResultsView.font = .marvelRegular(ofSize: 34)
noResultsView.textAlignment = .center
noResultsView.textColor = .marvelLabelText
noResultsView.isHidden = true
noResultsView.translatesAutoresizingMaskIntoConstraints = false
// Error View
errorStackView.axis = .vertical
errorStackView.alignment = .center
errorStackView.spacing = 8
errorStackView.isHidden = true
errorStackView.translatesAutoresizingMaskIntoConstraints = false
errorHeaderLabel.text = "Please Try Again Later..."
errorHeaderLabel.font = .marvelRegular(ofSize: 27)
errorHeaderLabel.textAlignment = .center
errorHeaderLabel.textColor = .marvelLabelText
errorDescriptionLabel.font = .marvelRegular(ofSize: 18)
errorDescriptionLabel.textAlignment = .center
errorDescriptionLabel.textColor = .marvelLabelText
errorDescriptionLabel.numberOfLines = 0
// Add Subviews
view.addSubview(collectionView)
view.addSubview(loadingView)
view.addSubview(noResultsView)
errorStackView.addArrangedSubview(errorHeaderLabel)
errorStackView.addArrangedSubview(errorDescriptionLabel)
view.addSubview(errorStackView)
}
private func setupConstraints() {
NSLayoutConstraint.activate([
collectionView.topAnchor.constraint(equalTo: view.topAnchor),
collectionView.leftAnchor.constraint(equalTo: view.leftAnchor),
collectionView.rightAnchor.constraint(equalTo: view.rightAnchor),
collectionView.bottomAnchor.constraint(equalTo: view.bottomAnchor),
loadingView.centerXAnchor.constraint(equalTo: view.centerXAnchor),
loadingView.centerYAnchor.constraint(equalTo: view.centerYAnchor),
noResultsView.centerXAnchor.constraint(equalTo: view.centerXAnchor),
noResultsView.centerYAnchor.constraint(equalTo: view.centerYAnchor),
errorStackView.centerYAnchor.constraint(equalTo: view.centerYAnchor),
errorStackView.leftAnchor.constraint(equalTo: view.leftAnchor, constant: 10),
errorStackView.rightAnchor.constraint(equalTo: view.rightAnchor, constant: -10),
])
}
private func setupViewModel() {
viewModel.count
.sink { [weak self] count in
self?.count = count
self?.collectionView.reloadSections(IndexSet(integer: 0))
}
.store(in: &cancellables)
viewModel.$state
.sink { [weak self] state in
switch state {
case .loading:
self?.loadingView.isHidden = false
self?.noResultsView.isHidden = true
self?.errorStackView.isHidden = true
case .data, .loadingMoreData:
self?.loadingView.isHidden = true
self?.noResultsView.isHidden = true
self?.errorStackView.isHidden = true
case .noData:
self?.loadingView.isHidden = true
self?.noResultsView.isHidden = false
self?.errorStackView.isHidden = true
case let .error(message):
self?.loadingView.isHidden = true
self?.noResultsView.isHidden = true
self?.errorStackView.isHidden = false
self?.errorDescriptionLabel.text = message
}
}
.store(in: &cancellables)
}
}
// MARK: - UISearchResultsUpdating
extension ComicsCollectionViewController: UISearchResultsUpdating {
func updateSearchResults(for searchController: UISearchController) {
guard let text = searchController.searchBar.text else {
return
}
viewModel.search(text, offset: 0)
}
}
// MARK: - UICollectionViewDataSource
extension ComicsCollectionViewController: UICollectionViewDataSource {
func collectionView(
_: UICollectionView,
numberOfItemsInSection _: Int
) -> Int {
return count
}
func collectionView(
_ collectionView: UICollectionView,
cellForItemAt indexPath: IndexPath
) -> UICollectionViewCell {
if let item = viewModel.item(at: indexPath.row) {
let cell = collectionView.dequeueReusableCell(
withReuseIdentifier: ComicsCollectionViewCell.cellIdentifier,
for: indexPath
) as! ComicsCollectionViewCell
cell.configure(with: item)
return cell
}
let cell = collectionView.dequeueReusableCell(
withReuseIdentifier: ComicsCollectionViewLoadingMoreCell.cellIdentifier,
for: indexPath
) as! ComicsCollectionViewLoadingMoreCell
cell.configure()
return cell
}
}
// MARK: - UICollectionViewDelegate
extension ComicsCollectionViewController: UICollectionViewDelegate {
func collectionView(
_: UICollectionView,
didSelectItemAt indexPath: IndexPath
) {
if let _ = viewModel.item(at: indexPath.row) {
viewModel.currentIndex = indexPath.item
let vc = ComicsDetailsCollectionViewController(viewModel: viewModel)
navigationController?.pushViewController(vc, animated: true)
}
}
func collectionView(
_ collectionView: UICollectionView,
didHighlightItemAt indexPath: IndexPath
) {
if let cell = collectionView.cellForItem(at: indexPath) as? ComicsCollectionViewCell {
cell.setHighligted(true)
}
}
func collectionView(
_ collectionView: UICollectionView,
didUnhighlightItemAt indexPath: IndexPath
) {
if let cell = collectionView.cellForItem(at: indexPath) as? ComicsCollectionViewCell {
cell.setHighligted(false)
}
}
}
// MARK: - UICollectionViewDataSourcePrefetching
extension ComicsCollectionViewController: UICollectionViewDataSourcePrefetching {
func collectionView(
_: UICollectionView,
prefetchItemsAt indexPaths: [IndexPath]
) {
for indexPath in indexPaths {
viewModel.prefetch(at: indexPath.item)
}
}
}
// MARK: - UIScrollViewDelegate
extension ComicsCollectionViewController: UIScrollViewDelegate {
func scrollViewDidEndDragging(
_: UIScrollView,
willDecelerate _: Bool
) {
switch viewModel.state {
case .loading:
()
default:
collectionView.refreshControl?.endRefreshing()
}
}
}
// MARK: - Actions
extension ComicsCollectionViewController {
@objc func refreshAction(refreshControl _: UIRefreshControl) {
viewModel.search("", offset: 0)
}
}