import PullableSheet

// ....

override func viewDidLoad() {
    super.viewDidLoad()
    
    let content = UIViewController() // your view controller
    content.view.backgroundColor = .clear

    let sheet = PullableSheet(content: content)
    sheet.snapPoints = [.min, .custom(y: 300), .max] // snap points (if needed)
    sheet.add(to: self)
}

let topBar = UIView(frame: .init(x: 0, y: 5, width: 300, height: 30))
topBar.backgroundColor = .green
let sheet = PullableSheet(content: content, topBarStyle: .custom(topBar))