metatext/Views/UIKit/CompositionPollView.swift

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Swift
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// Copyright © 2021 Metabolist. All rights reserved.
import Combine
import UIKit
import ViewModels
final class CompositionPollView: UIView {
private let viewModel: CompositionViewModel
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private let parentViewModel: NewStatusViewModel
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private let stackView = UIStackView()
private var cancellables = Set<AnyCancellable>()
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init(viewModel: CompositionViewModel, parentViewModel: NewStatusViewModel) {
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self.viewModel = viewModel
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self.parentViewModel = parentViewModel
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super.init(frame: .zero)
initialSetup()
}
@available(*, unavailable)
required init?(coder: NSCoder) {
fatalError("init(coder:) has not been implemented")
}
}
private extension CompositionPollView {
static let dateComponentsFormatter: DateComponentsFormatter = {
let formatter = DateComponentsFormatter()
formatter.unitsStyle = .full
return formatter
}()
static func format(expiry: CompositionViewModel.PollExpiry) -> String? {
dateComponentsFormatter.string(from: TimeInterval(expiry.rawValue))
}
var pollOptionViews: [CompositionPollOptionView] {
stackView.arrangedSubviews.compactMap({ $0 as? CompositionPollOptionView })
}
// swiftlint:disable:next function_body_length
func initialSetup() {
addSubview(stackView)
stackView.translatesAutoresizingMaskIntoConstraints = false
stackView.axis = .vertical
stackView.spacing = .defaultSpacing
let buttonsStackView = UIStackView()
stackView.addArrangedSubview(buttonsStackView)
buttonsStackView.distribution = .fillEqually
let addChoiceButton = UIButton(primaryAction: UIAction { [weak self] _ in self?.viewModel.addPollOption() })
buttonsStackView.addArrangedSubview(addChoiceButton)
addChoiceButton.setImage(
UIImage(systemName: "plus",
withConfiguration: UIImage.SymbolConfiguration(scale: .medium)),
for: .normal)
addChoiceButton.setTitle(NSLocalizedString("compose.poll.add-choice", comment: ""), for: .normal)
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addChoiceButton.imageEdgeInsets = .init(top: 0, left: 0, bottom: 0, right: .defaultSpacing)
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let expiresInButton = UIButton(type: .system)
buttonsStackView.addArrangedSubview(expiresInButton)
expiresInButton.setImage(
UIImage(systemName: "clock",
withConfiguration: UIImage.SymbolConfiguration(scale: .medium)),
for: .normal)
expiresInButton.showsMenuAsPrimaryAction = true
expiresInButton.menu = UIMenu(children: CompositionViewModel.PollExpiry.allCases.map { expiry in
UIAction(title: Self.format(expiry: expiry) ?? "") { [weak self] _ in
self?.viewModel.pollExpiresIn = expiry
}
})
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expiresInButton.imageEdgeInsets = .init(top: 0, left: 0, bottom: 0, right: .defaultSpacing)
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let switchStackView = UIStackView()
switchStackView.spacing = .defaultSpacing
stackView.addArrangedSubview(switchStackView)
let allowMultipleLabel = UILabel()
switchStackView.addArrangedSubview(allowMultipleLabel)
allowMultipleLabel.adjustsFontForContentSizeCategory = true
allowMultipleLabel.font = .preferredFont(forTextStyle: .callout)
allowMultipleLabel.textColor = .secondaryLabel
allowMultipleLabel.text = NSLocalizedString("compose.poll.allow-multiple-choices", comment: "")
allowMultipleLabel.textAlignment = .right
let allowMultipleSwitch = UISwitch()
switchStackView.addArrangedSubview(allowMultipleSwitch)
allowMultipleSwitch.addAction(
UIAction { [weak self] _ in
self?.viewModel.sensitive = allowMultipleSwitch.isOn
},
for: .valueChanged)
NSLayoutConstraint.activate([
stackView.leadingAnchor.constraint(equalTo: leadingAnchor),
stackView.topAnchor.constraint(equalTo: topAnchor),
stackView.trailingAnchor.constraint(equalTo: trailingAnchor),
stackView.bottomAnchor.constraint(equalTo: bottomAnchor),
buttonsStackView.heightAnchor.constraint(greaterThanOrEqualToConstant: .minimumButtonDimension)
])
viewModel.$pollOptions.sink { [weak self] in
guard let self = self else { return }
addChoiceButton.isEnabled = $0.count < CompositionViewModel.maxPollOptionCount
for (index, option) in $0.enumerated() {
if !self.pollOptionViews.contains(where: { $0.option === option }) {
let optionView = CompositionPollOptionView(
viewModel: self.viewModel,
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parentViewModel: self.parentViewModel,
option: option)
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optionView.textField.placeholder = String.localizedStringWithFormat(
NSLocalizedString("compose.poll.option-%ld", comment: ""),
index + 1)
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self.stackView.insertArrangedSubview(optionView, at: index)
}
}
for (index, optionView) in self.pollOptionViews.enumerated() {
optionView.removeButton.isHidden = index < CompositionViewModel.minPollOptionCount
if !$0.contains(where: { $0 === optionView.option }) {
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if optionView.textField.isFirstResponder {
if index > 0 {
self.pollOptionViews[index - 1].textField.becomeFirstResponder()
} else if self.pollOptionViews.count > index {
self.pollOptionViews[index + 1].textField.becomeFirstResponder()
}
}
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optionView.removeFromSuperview()
}
}
}
.store(in: &cancellables)
viewModel.$pollExpiresIn
.sink { expiresInButton.setTitle(Self.format(expiry: $0), for: .normal) }
.store(in: &cancellables)
viewModel.$pollMultipleChoice
.sink { allowMultipleSwitch.isEnabled = !$0 }
.store(in: &cancellables)
}
}