Swift UITableViewCell点击展开

let tap:UITapGestureRecognizer = UITapGestureRecognizer.init(target: self, action: #selector(headViewClick))
view?.isUserInteractionEnabled = true
view?.addGestureRecognizer(tap)

@objc func headViewClick() -> Void {
if showAll {
showAll = false

}else{
showAll = true

}
let set:IndexSet = IndexSet.init(integer: 0)
tableView.reloadSections(set as IndexSet, with: UITableViewRowAnimation.fade)
}

func tableView(_ tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
if showAll {
return 8
}else{
return 0

}

}