Я пытаюсь реализовать текстовое представление, которое динамически меняет свою высоту с текстом, который он передает.Я нашел, как это сделать, но при этом я должен использовать ограничения VisualFormat.При реализации ограничений VisualFormat ограничения, установленные вне текущей ячейки, искажаются и возвращаются к параметрам по умолчанию (origin @ (0, 0) и т. Д.).Мне интересно, что я делаю не так, потому что из того, что я вижу, я делаю вещи по книге.Пожалуйста, дайте мне знать, спасибо.
import UIKit
class PostDetailController: UICollectionViewController, UICollectionViewDelegateFlowLayout {
private let headerId = "headerId"
private let infoId = "infoId"
private let textId = "textId"
var post: Post? {
didSet {
}
}
override func viewDidLoad() {
super.viewDidLoad()
collectionView?.backgroundView = backView
collectionView?.contentInsetAdjustmentBehavior = .never
collectionView?.translatesAutoresizingMaskIntoConstraints = false
collectionView?.register(PostDetailHeader.self, forSupplementaryViewOfKind: UICollectionElementKindSectionHeader, withReuseIdentifier: headerId)
collectionView?.register(PostDetailInfomation.self, forCellWithReuseIdentifier: infoId)
collectionView?.register(PostDetailText.self, forCellWithReuseIdentifier: textId)
let layout = collectionView?.collectionViewLayout as? UICollectionViewFlowLayout
layout?.minimumLineSpacing = 0
}
let backView: UIImageView = {
let iv = UIImageView()
iv.image = UIImage(named: "BackgroundGradient")
iv.contentMode = .scaleAspectFill
return iv
}()
func collectionView(_ collectionView: UICollectionView, layout collectionViewLayout: UICollectionViewLayout, referenceSizeForHeaderInSection section: Int) -> CGSize {
return CGSize(width: view.frame.width, height: 220)
}
override func collectionView(_ collectionView: UICollectionView, cellForItemAt indexPath: IndexPath) -> UICollectionViewCell {
if indexPath.item == 1 {
let cell = collectionView.dequeueReusableCell(withReuseIdentifier: textId, for: indexPath) as! PostDetailText
cell.textView.attributedText = textAttributedText()
return cell
}
let cell = collectionView.dequeueReusableCell(withReuseIdentifier: infoId, for: indexPath) as! PostDetailInfomation
cell.post = post
return cell
}
private func textAttributedText() -> NSAttributedString {
let attributedText = NSMutableAttributedString(string: "", attributes: [NSAttributedStringKey.font: UIFont(name: "Avenir-Medium", size: 14)!])
if let text = post?.dummyText {
attributedText.append(NSAttributedString(string: text, attributes: [NSAttributedStringKey.font: UIFont(name: "Avenir-Medium", size: 14)!, NSAttributedStringKey.foregroundColor: UIColor(red: 104.0/255.0, green: 104.0/255.0, blue: 104.0/255.0, alpha: 1.0)]))
}
return attributedText
}
override func collectionView(_ collectionView: UICollectionView, numberOfItemsInSection section: Int) -> Int {
return 2
}
func collectionView(_ collectionView: UICollectionView, layout collectionViewLayout: UICollectionViewLayout, sizeForItemAt indexPath: IndexPath) -> CGSize {
if indexPath.item == 1 {
let dummySize = CGSize(width: view.frame.width - 34, height: 1000)
let options = NSStringDrawingOptions.usesFontLeading.union(NSStringDrawingOptions.usesLineFragmentOrigin)
let rect = textAttributedText().boundingRect(with: dummySize, options: options, context: nil)
return CGSize(width: view.frame.width, height: rect.height + 100)
}
return CGSize(width: view.frame.width, height: 167)
}
override func collectionView(_ collectionView: UICollectionView, viewForSupplementaryElementOfKind kind: String, at indexPath: IndexPath) -> UICollectionReusableView {
let header = collectionView.dequeueReusableSupplementaryView(ofKind: kind, withReuseIdentifier: headerId, for: indexPath) as! PostDetailHeader
return header
}
}
class PostDetailHeader: BaseCell {
override func setupViews() {
super.setupViews()
backgroundColor = UIColor.clear
}
}
class PostDetailInfomation: BaseCell {
var post: Post? {
didSet {
if let imageName = post?.companyNameLogo {
companyNameLogo.image = UIImage(named: imageName)
}
if let title = post?.title {
titleLabel.text = title
}
if let detail = post?.detail {
detailLabel.text = detail
}
if let imageName = post?.profileImage {
profileImageView.image = UIImage(named: imageName)
}
if let name = post?.name {
nameLabel.text = "By: " + name
}
if let time = post?.time {
timeLabel.text = time
}
if let text = post?.dummyText {
textView.text = text
}
if let hashtag = post?.hash1 {
hashButton1.setTitle(hashtag, for: .normal)
}
if let hashtag = post?.hash2 {
hashButton2.setTitle(hashtag, for: .normal)
}
}
}
override func setupViews() {
super.setupViews()
backgroundColor = UIColor.white
let margin = 17 as CGFloat
let hashButtonHeight = 25 as CGFloat
companyNameLogo.translatesAutoresizingMaskIntoConstraints = false
addSubview(companyNameLogo)
companyNameLogo.frame = CGRect(x: 15, y: 27, width: 134, height: 25)
hashButton1.translatesAutoresizingMaskIntoConstraints = false
addSubview(hashButton1)
hashButton1.frame = CGRect(x: 181, y: 27, width: 100, height: hashButtonHeight)
hashButton1.layer.cornerRadius = hashButton1.frame.height/2
hashButton1.layer.masksToBounds = true
hashButton2.translatesAutoresizingMaskIntoConstraints = false
addSubview(hashButton2)
hashButton2.frame = CGRect(x: hashButton1.frame.maxX + 2, y: hashButton1.frame.minY, width: 75, height: hashButtonHeight)
hashButton2.layer.cornerRadius = hashButton2.frame.height/2
hashButton2.layer.masksToBounds = true
titleLabel.translatesAutoresizingMaskIntoConstraints = false
addSubview(titleLabel)
titleLabel.frame = CGRect(x: margin, y: companyNameLogo.frame.maxY + 17, width: 269, height: 30)
detailLabel.translatesAutoresizingMaskIntoConstraints = false
addSubview(detailLabel)
detailLabel.frame = CGRect(x: margin, y: titleLabel.frame.maxY + 8, width: 304, height: 22)
profileImageView.translatesAutoresizingMaskIntoConstraints = false
addSubview(profileImageView)
profileImageView.frame = CGRect(x: margin, y: detailLabel.frame.maxY + 8, width: 30, height: 30)
profileImageView.layer.cornerRadius = profileImageView.frame.width/2
profileImageView.layer.masksToBounds = true
nameLabel.translatesAutoresizingMaskIntoConstraints = false
addSubview(nameLabel)
nameLabel.frame = CGRect(x: profileImageView.frame.maxX + 15, y: profileImageView.frame.minY + 6, width: 200, height: 19)
timeLabel.translatesAutoresizingMaskIntoConstraints = false
addSubview(timeLabel)
timeLabel.frame = CGRect(x: nameLabel.frame.maxX, y: profileImageView.frame.minY + 6, width: contentView.frame.width - nameLabel.frame.maxX - 17, height: 19)
}
let companyNameLogo: UIImageView = {
let iv = UIImageView()
iv.contentMode = .scaleAspectFill
return iv
}()
let titleLabel: UILabel = {
let label = UILabel()
label.font = UIFont(name: "Avenir-Heavy", size: 22)
label.textColor = UIColor.black
label.textAlignment = .left
return label
}()
let detailLabel: UILabel = {
let label = UILabel()
label.font = UIFont(name: "Avenir-Medium", size: 16)
label.textColor = UIColor(red: 171.0/255.0, green: 171.0/255.0, blue: 171.0/255.0, alpha: 1.0)
label.textAlignment = .left
return label
}()
let profileImageView: UIImageView = {
let iv = UIImageView()
iv.contentMode = .scaleAspectFill
return iv
}()
let nameLabel: UILabel = {
let label = UILabel()
label.font = UIFont(name: "Avenir-Medium", size: 14)
label.textColor = UIColor(red: 104.0/255.0, green: 104.0/255.0, blue: 104.0/255.0, alpha: 1.0)
label.textAlignment = .left
return label
}()
let timeLabel: UILabel = {
let label = UILabel()
label.font = UIFont(name: "Avenir-Medium", size: 14)
label.textColor = UIColor(red: 194.0/255.0, green: 194.0/255.0, blue: 194.0/255.0, alpha: 1.0)
label.textAlignment = .right
return label
}()
let textView: UILabel = {
let label = UILabel()
label.font = UIFont(name: "Avenir-Medium", size: 14)
label.textColor = UIColor(red: 104.0/255.0, green: 104.0/255.0, blue: 104.0/255.0, alpha: 1.0)
label.textAlignment = .left
label.sizeToFit()
label.numberOfLines = 0
return label
}()
let hashButton1: UIButton = {
let button = UIButton()
button.titleLabel?.font = UIFont(name: "Avenir-Medium", size: 13)
button.setTitleColor(UIColor.black, for: .normal)
button.titleEdgeInsets = UIEdgeInsets(top: 4, left: 7, bottom: 4, right: 7)
button.backgroundColor = UIColor(red: 236.0/255.0, green: 243.0/255.0, blue: 249.0/255.0, alpha: 1.0)
return button
}()
let hashButton2: UIButton = {
let button = UIButton()
button.titleLabel?.font = UIFont(name: "Avenir-Medium", size: 13)
button.setTitleColor(UIColor.black, for: .normal)
button.titleEdgeInsets = UIEdgeInsets(top: 4, left: 7, bottom: 4, right: 7)
button.backgroundColor = UIColor(red: 236.0/255.0, green: 243.0/255.0, blue: 249.0/255.0, alpha: 1.0)
return button
}()
}
class PostDetailText: BaseCell {
override func setupViews() {
super.setupViews()
backgroundColor = UIColor.white
textView.translatesAutoresizingMaskIntoConstraints = false
addSubview(textView)
textView.frame = CGRect(x: 17, y: 25, width: contentView.frame.width - 34, height: 200)
addConstraints(NSLayoutConstraint.constraints(withVisualFormat: "H:|-17-[v0]-17-|", options: NSLayoutFormatOptions(), metrics: nil, views: ["v0" : textView]))
addConstraints(NSLayoutConstraint.constraints(withVisualFormat: "V:|-0-[v0]|", options: NSLayoutFormatOptions(), metrics: nil, views: ["v0" : textView]))
}
let textView: UITextView = {
let tv = UITextView()
return tv
}()
}
class BaseCell: UICollectionViewCell {
override init(frame: CGRect) {
super.init(frame: frame)
setupViews()
}
required init?(coder aDecoder: NSCoder) {
fatalError("init(coder:) has not been implemented")
}
func setupViews() {
}
}