Blog post: SwiftUI with UICollectionView - 17. UIButton positioned on top of the SwiftUI View

swiftui-uicollectionviewcell-with-uibutton.swift

import SwiftUI
import UIKit

class MyCollectionViewCell: SwiftUICollectionViewCell<Card> {

    static var reuseIdentifier = "MyCollectionViewCell"

    typealias Content = Card.Content
    
    lazy var heartButton: UIHeartButton = {
        return UIHeartButton()
    }()
    
    override init(frame: CGRect) {
        super.init(frame: frame)
        contentView.addSubview(heartButton)
    }
    
    required init?(coder: NSCoder) {
        fatalError("init(coder:) has not been implemented")
    }
    
    func configure(with content: Content, parent: UIViewController) {
        embed(in: parent, withView: Card(content: content))
        host?.view.frame = self.contentView.bounds
        
        // UIButton layout
        heartButton.frame = CGRect(x: contentView.bounds.width - 60, y: 20, width: 40, height: 40)
        contentView.bringSubviewToFront(heartButton)
    }
}