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class RatingStarView: UIView, UICollectionViewDelegateFlowLayout {
var ratingStarCallBack: ((Double) -> Void)?
lazy var collectionView: UICollectionView = {
let collectionV = UICollectionView(frame: self.bounds, collectionViewLayout: ratingFlowlayout)
collectionV.translatesAutoresizingMaskIntoConstraints = false
collectionV.delegate = self
collectionV.dataSource = self
collectionV.register(RatingStarCollectionCell.self)
collectionV.isScrollEnabled = false
collectionV.isUserInteractionEnabled = false
collectionV.backgroundColor = .white
return collectionV
}()
lazy var ratingFlowlayout: UICollectionViewFlowLayout = {
let layout = UICollectionViewFlowLayout()
layout.minimumLineSpacing = 0
layout.minimumInteritemSpacing = 0
return layout
}()
required init?(coder: NSCoder) {
fatalError("init(coder:) has not been implemented")
}
public var selectCount: Double = 0 {
didSet {
collectionView.reloadData()
}
}
init() {
super.init(frame: .zero)
addSubview(collectionView)
NSLayoutConstraint.activate([
collectionView.leadingAnchor.constraint(equalTo: self.leadingAnchor),
collectionView.trailingAnchor.constraint(equalTo: self.trailingAnchor),
collectionView.topAnchor.constraint(equalTo: self.topAnchor),
collectionView.bottomAnchor.constraint(equalTo: self.bottomAnchor)
])
}
override func layoutSubviews() {
super.layoutSubviews()
collectionView.reloadData()
}
}
extension RatingStarView: UICollectionViewDataSource {
func collectionView(_ collectionView: UICollectionView, layout collectionViewLayout: UICollectionViewLayout, sizeForItemAt indexPath: IndexPath) -> CGSize {
let itemW: CGFloat = collectionView.frame.size.width / 5.0
let itemH: CGFloat = collectionView.frame.size.height
return CGSize(width: itemW, height: itemH)
}
func collectionView(_ collectionView: UICollectionView, numberOfItemsInSection section: Int) -> Int {
return 5
}
func collectionView(_ collectionView: UICollectionView, cellForItemAt indexPath: IndexPath) -> UICollectionViewCell {
let cell = collectionView.dequeueReusableCell(RatingStarCollectionCell.self, for: indexPath)
let offset = round(selectCount * 2.0) / 2.0
if Double(indexPath.row) < floor(offset) {
cell.selectImageView.image = R.image.rateStarFilled
} else {
cell.selectImageView.image = R.image.rateStarOutline
}
return cell
}
}
extension RatingStarView {
override func touchesBegan(_ touches: Set<UITouch>, with event: UIEvent?) {
handleTouch(touches.first)
}
override func touchesMoved(_ touches: Set<UITouch>, with event: UIEvent?) {
handleTouch(touches.first)
}
override func touchesEnded(_ touches: Set<UITouch>, with event: UIEvent?) {
handleTouch(touches.first)
}
func handleTouch(_ touch: UITouch?) {
let touchPoint = touch?.location(in: collectionView)
let scale = touchPoint!.x / collectionView.frame.size.width
var offset = scale * 5
offset = ceil(offset)
offset = offset > 0 ? offset : 1
offset = offset <= 5 ? offset : 5
self.selectCount = Double(Int(offset))
ratingStarCallBack?(self.selectCount)
}
}
class RatingStarCollectionCell: UICollectionViewCell, YReusable {
lazy var selectImageView: UIImageView = {
let imgView = UIImageView()
imgView.translatesAutoresizingMaskIntoConstraints = false
imgView.contentMode = .scaleAspectFit
return imgView
}()
required init?(coder: NSCoder) {
fatalError("init(coder:) has not been implemented")
}
override init(frame: CGRect) {
super.init(frame: frame)
contentView.addSubview(selectImageView)
NSLayoutConstraint.activate([
selectImageView.leadingAnchor.constraint(equalTo: contentView.leadingAnchor),
selectImageView.trailingAnchor.constraint(equalTo: contentView.trailingAnchor),
selectImageView.topAnchor.constraint(equalTo: contentView.topAnchor),
selectImageView.bottomAnchor.constraint(equalTo: contentView.bottomAnchor)
])
}
}
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