78 lines
2.4 KiB
Swift
78 lines
2.4 KiB
Swift
//
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// ProfileHeaderCollectionViewCell.swift
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// Tusker
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//
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// Created by Shadowfacts on 10/10/22.
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// Copyright © 2022 Shadowfacts. All rights reserved.
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//
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import UIKit
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class ProfileHeaderCollectionViewCell: UICollectionViewCell {
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private var state: State = .unloaded
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var view: ProfileHeaderView? {
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if case .view(let view) = state {
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return view
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} else {
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return nil
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}
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}
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override init(frame: CGRect) {
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super.init(frame: frame)
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contentView.backgroundColor = .appBackground
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isOpaque = true
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contentView.isOpaque = true
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}
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required init?(coder: NSCoder) {
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fatalError("init(coder:) has not been implemented")
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}
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func addHeader(_ header: ProfileHeaderView) {
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switch state {
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case .unloaded, .placeholder(heightConstraint: _):
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header.translatesAutoresizingMaskIntoConstraints = false
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contentView.embedSubview(header)
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self.state = .view(header)
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case .view(_):
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fatalError("profile header collection view cell already has view")
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}
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}
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func addConstraint(height: CGFloat) -> ProfileHeaderView? {
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switch state {
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case .unloaded:
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let constraint = contentView.heightAnchor.constraint(equalToConstant: height)
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constraint.isActive = true
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state = .placeholder(heightConstraint: constraint)
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return nil
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case .placeholder(let heightConstraint):
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heightConstraint.constant = height
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return nil
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case .view(let header):
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let constraint = contentView.heightAnchor.constraint(equalToConstant: height)
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constraint.isActive = true
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state = .placeholder(heightConstraint: constraint)
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return header
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}
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}
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// overrides an internal method
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// when the super impl is used, preferredLayoutAttributesFitting(_:) isn't called while the view is offscreen (i.e., window == nil)
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// and so the collection view imposes a height of 44pts which breaks the layout
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@objc func _preferredLayoutAttributesFittingAttributes(_ attributes: UICollectionViewLayoutAttributes) -> UICollectionViewLayoutAttributes {
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return preferredLayoutAttributesFitting(attributes)
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}
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enum State {
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case unloaded
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case placeholder(heightConstraint: NSLayoutConstraint)
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case view(ProfileHeaderView)
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}
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}
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