swift/collectionviewCell選択時に背景色を変更
import UIKit
class ThumbnailCell: UICollectionViewCell {
var thumbnailImageView: UIImageView
required init?(coder: NSCoder) {
fatalError("init(coder:) has not been implemented")
}
override init(frame: CGRect) {
thumbnailImageView = .init(frame: .zero)
super.init(frame: frame)
self.backgroundColor = .gray
let selectedBGView = UIView(frame: self.frame)
selectedBGView.backgroundColor = .orange
self.selectedBackgroundView = selectedBGView
configureImageView()
}
private func configureImageView() {
thumbnailImageView.translatesAutoresizingMaskIntoConstraints = false
contentView.addSubview(thumbnailImageView)
NSLayoutConstraint.activate([
thumbnailImageView.topAnchor.constraint(equalTo: contentView.topAnchor, constant: 3),
thumbnailImageView.bottomAnchor.constraint(equalTo: contentView.bottomAnchor, constant: -3),
thumbnailImageView.leadingAnchor.constraint(equalTo: contentView.leadingAnchor, constant: 3),
thumbnailImageView.trailingAnchor.constraint(equalTo: contentView.trailingAnchor, constant: -3)
])
}
}
上記の場合では未選択時にグレー、選択時にオレンジになる
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