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// | |
// ViewController.swift | |
// CVSelfSizingCells | |
// | |
// Created by Jolas L on 13/06/20. | |
// Copyright © 2020 Jolas L. All rights reserved. | |
// | |
import UIKit | |
class ViewController: UIViewController, UICollectionViewDataSource { | |
let collectionView: UICollectionView = { | |
let flowLayout = UICollectionViewFlowLayout() | |
flowLayout.estimatedItemSize = UICollectionViewFlowLayout.automaticSize | |
let collectionView = UICollectionView(frame: .zero, collectionViewLayout: flowLayout) | |
collectionView.translatesAutoresizingMaskIntoConstraints = false | |
return collectionView | |
}() | |
override func viewDidLoad() { | |
super.viewDidLoad() | |
view.addSubview(collectionView) | |
collectionView.dataSource = self | |
collectionView.backgroundColor = .white | |
collectionView.register(MultiLineCell.self, forCellWithReuseIdentifier: "cellId") | |
NSLayoutConstraint.activate([ | |
collectionView.leadingAnchor.constraint(equalTo: view.leadingAnchor), | |
collectionView.topAnchor.constraint(equalTo: view.topAnchor), | |
collectionView.trailingAnchor.constraint(equalTo: view.trailingAnchor), | |
collectionView.bottomAnchor.constraint(equalTo: view.bottomAnchor), | |
]) | |
} | |
func collectionView(_ collectionView: UICollectionView, numberOfItemsInSection section: Int) -> Int { | |
dummyTextMessages.count | |
} | |
func collectionView(_ collectionView: UICollectionView, cellForItemAt indexPath: IndexPath) -> UICollectionViewCell { | |
let cell = collectionView.dequeueReusableCell(withReuseIdentifier: "cellId", for: indexPath) as! MultiLineCell | |
cell.textLabel.text = dummyTextMessages[indexPath.row] | |
cell.maxWidth = collectionView.frame.width | |
return cell | |
} | |
} | |
class MultiLineCell: UICollectionViewCell{ | |
let containerView: UIView = { | |
let view = UIView() | |
view.translatesAutoresizingMaskIntoConstraints = false | |
return view | |
}() | |
let textLabel: UILabel = { | |
let textLabel = UILabel() | |
textLabel.backgroundColor = .red | |
textLabel.font = UIFont.systemFont(ofSize: 20) | |
textLabel.numberOfLines = 0 | |
textLabel.translatesAutoresizingMaskIntoConstraints = false | |
return textLabel | |
}() | |
private var containerViewWidthAnchor:NSLayoutConstraint! | |
private var textViewHeightContraint: NSLayoutConstraint! | |
var maxWidth: CGFloat? { | |
didSet { | |
guard let maxWidth = maxWidth else { | |
return | |
} | |
containerViewWidthAnchor.constant = maxWidth | |
containerViewWidthAnchor.isActive = true | |
} | |
} | |
override init(frame: CGRect) { | |
super.init(frame: frame) | |
backgroundColor = .cyan | |
contentView.addSubview(containerView) | |
containerView.addSubview(textLabel) | |
containerViewWidthAnchor = containerView.widthAnchor.constraint(equalToConstant: 0) | |
NSLayoutConstraint.activate([ | |
containerView.leadingAnchor.constraint(equalTo: contentView.leadingAnchor), | |
containerView.topAnchor.constraint(equalTo: contentView.topAnchor), | |
containerView.trailingAnchor.constraint(equalTo: contentView.trailingAnchor), | |
containerView.bottomAnchor.constraint(equalTo: contentView.bottomAnchor), | |
textLabel.leadingAnchor.constraint(equalTo: containerView.leadingAnchor), | |
textLabel.topAnchor.constraint(equalTo: containerView.topAnchor), | |
textLabel.trailingAnchor.constraint(equalTo: containerView.trailingAnchor), | |
textLabel.bottomAnchor.constraint(equalTo: containerView.bottomAnchor), | |
]) | |
} | |
required init?(coder: NSCoder) { | |
fatalError("init(coder:) has not been implemented") | |
} | |
} | |
let dummyTextMessages = [ | |
"Hello", | |
"Hi", | |
"Hey! Last time I have purchased a brand new watch from solutions.", | |
"Thanks for contacting us we are here to help you. Please read all the schemes. ", | |
"Sathish Kumar V Thanks for reaching out. Lorem Ipsum is simply dummy text of the printing and typesetting industry. Lorem Ipsum has been the industry's standard dummy text ever since the 1500s, when an unknown printer took a galley of type and scrambprinter took a galley Hgjhagsdg asjhdgjhasgdjha asjhdgajhsdghjasg asjhdgjhagsd jhagsdjhgasjhdgajsd", | |
"Hel asdjjha skjhajsdhalo", | |
"H jkahskdhaksdh jkahsgdjh jahsgh hgashdgh hhh hghg hghsgdhgash ello", | |
"kjjkasjkdjk jaskjdjkasdjk askjjkaskjkjkjskj nskjkskik s k skksknn", | |
"aslkdjkjas ajksdkjasd ajksdkjasd", | |
"askjdjkasdjkasd", | |
] |
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