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Fix crash when searching fails

This commit is contained in:
Shadowfacts 2021-05-22 11:22:01 -04:00
parent 421881d461
commit 9ec7177bfa
Signed by untrusted user: shadowfacts
GPG Key ID: 94A5AB95422746E5
1 changed files with 82 additions and 45 deletions
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127
Tusker/Screens/Search/SearchResultsViewController.swift
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@ -36,6 +36,7 @@ class SearchResultsViewController: EnhancedTableViewController {
var dataSource: UITableViewDiffableDataSource<Section, Item>!
private var activityIndicator: UIActivityIndicatorView!
private var errorLabel: UILabel!
/// Types of results to search for. `nil` means all results will be included.
var resultTypes: [SearchResultType]? = nil
@ -60,6 +61,22 @@ class SearchResultsViewController: EnhancedTableViewController {
override func viewDidLoad() {
super.viewDidLoad()
errorLabel = UILabel()
errorLabel.translatesAutoresizingMaskIntoConstraints = false
errorLabel.font = .preferredFont(forTextStyle: .callout)
errorLabel.textColor = .secondaryLabel
errorLabel.numberOfLines = 0
errorLabel.textAlignment = .center
errorLabel.setContentHuggingPriority(.defaultLow, for: .horizontal)
tableView.addSubview(errorLabel)
NSLayoutConstraint.activate([
errorLabel.centerYAnchor.constraint(equalTo: view.safeAreaLayoutGuide.centerYAnchor),
errorLabel.centerXAnchor.constraint(equalTo: tableView.centerXAnchor),
errorLabel.leadingAnchor.constraint(equalToSystemSpacingAfter: tableView.leadingAnchor, multiplier: 1),
tableView.trailingAnchor.constraint(equalToSystemSpacingAfter: errorLabel.trailingAnchor, multiplier: 1),
])
tableView.register(UINib(nibName: "AccountTableViewCell", bundle: .main), forCellReuseIdentifier: accountCell)
tableView.register(UINib(nibName: "TimelineStatusTableViewCell", bundle: .main), forCellReuseIdentifier: statusCell)
@ -131,59 +148,79 @@ class SearchResultsViewController: EnhancedTableViewController {
activityIndicator.isHidden = false
activityIndicator.startAnimating()
errorLabel.isHidden = true
let resultTypes = self.resultTypes
let request = Client.search(query: query, types: resultTypes, resolve: true, limit: 10)
mastodonController.run(request) { (response) in
guard case let .success(results, _) = response else { fatalError() }
DispatchQueue.main.async {
self.activityIndicator.isHidden = true
self.activityIndicator.stopAnimating()
}
guard self.currentQuery == query else { return }
let oldSnapshot = self.dataSource.snapshot()
var snapshot = NSDiffableDataSourceSnapshot<Section, Item>()
self.mastodonController.persistentContainer.performBatchUpdates({ (context, addAccounts, addStatuses) in
if oldSnapshot.indexOfSection(.accounts) != nil {
oldSnapshot.itemIdentifiers(inSection: .accounts).forEach { (item) in
guard case let .account(id) = item else { return }
self.mastodonController.persistentContainer.account(for: id, in: context)?.decrementReferenceCount()
}
}
if oldSnapshot.indexOfSection(.statuses) != nil {
oldSnapshot.itemIdentifiers(inSection: .statuses).forEach { (item) in
guard case let .status(id, _) = item else { return }
self.mastodonController.persistentContainer.status(for: id, in: context)?.decrementReferenceCount()
}
}
if !results.accounts.isEmpty && (resultTypes == nil || resultTypes!.contains(.accounts)) {
snapshot.appendSections([.accounts])
snapshot.appendItems(results.accounts.map { .account($0.id) }, toSection: .accounts)
addAccounts(results.accounts)
}
if !results.hashtags.isEmpty && (resultTypes == nil || resultTypes!.contains(.hashtags)) {
snapshot.appendSections([.hashtags])
snapshot.appendItems(results.hashtags.map { .hashtag($0) }, toSection: .hashtags)
}
if !results.statuses.isEmpty && (resultTypes == nil || resultTypes!.contains(.statuses)) {
snapshot.appendSections([.statuses])
snapshot.appendItems(results.statuses.map { .status($0.id, .unknown) }, toSection: .statuses)
addStatuses(results.statuses)
}
}, completion: {
switch response {
case let .success(results, _):
guard self.currentQuery == query else { return }
DispatchQueue.main.async {
self.dataSource.apply(snapshot)
self.activityIndicator.isHidden = true
self.activityIndicator.stopAnimating()
}
})
self.showSearchResults(results)
case let .failure(error):
DispatchQueue.main.async {
self.activityIndicator.isHidden = true
self.activityIndicator.stopAnimating()
self.showSearchError(error)
}
}
}
}
private func showSearchResults(_ results: SearchResults) {
let oldSnapshot = self.dataSource.snapshot()
var snapshot = NSDiffableDataSourceSnapshot<Section, Item>()
self.mastodonController.persistentContainer.performBatchUpdates({ (context, addAccounts, addStatuses) in
if oldSnapshot.indexOfSection(.accounts) != nil {
oldSnapshot.itemIdentifiers(inSection: .accounts).forEach { (item) in
guard case let .account(id) = item else { return }
self.mastodonController.persistentContainer.account(for: id, in: context)?.decrementReferenceCount()
}
}
if oldSnapshot.indexOfSection(.statuses) != nil {
oldSnapshot.itemIdentifiers(inSection: .statuses).forEach { (item) in
guard case let .status(id, _) = item else { return }
self.mastodonController.persistentContainer.status(for: id, in: context)?.decrementReferenceCount()
}
}
let resultTypes = self.resultTypes
if !results.accounts.isEmpty && (resultTypes == nil || resultTypes!.contains(.accounts)) {
snapshot.appendSections([.accounts])
snapshot.appendItems(results.accounts.map { .account($0.id) }, toSection: .accounts)
addAccounts(results.accounts)
}
if !results.hashtags.isEmpty && (resultTypes == nil || resultTypes!.contains(.hashtags)) {
snapshot.appendSections([.hashtags])
snapshot.appendItems(results.hashtags.map { .hashtag($0) }, toSection: .hashtags)
}
if !results.statuses.isEmpty && (resultTypes == nil || resultTypes!.contains(.statuses)) {
snapshot.appendSections([.statuses])
snapshot.appendItems(results.statuses.map { .status($0.id, .unknown) }, toSection: .statuses)
addStatuses(results.statuses)
}
}, completion: {
DispatchQueue.main.async {
self.errorLabel.isHidden = true
self.dataSource.apply(snapshot)
}
})
}
private func showSearchError(_ error: Client.Error) {
let snapshot = NSDiffableDataSourceSnapshot<Section, Item>()
dataSource.apply(snapshot)
errorLabel.isHidden = false
errorLabel.text = error.localizedDescription
}
// MARK: - Table view delegate
override func tableView(_ tableView: UITableView, didSelectRowAt indexPath: IndexPath) {