在UITableView

Question

我一直试图在我的uitableview上设置长按手势识别器。我已经能够让它注册，但它似乎给我关联行的不正确的信息。我的tableview按正常点击按预期工作，它传递indexPath.row，我能够从与该行关联的people数组中获取正确的记录。但是，在使用下面的代码时，indexPath.row似乎不一致并选择上方和下方的行，然后在滚动时，它会在长按时选择随机记录。

func longPress(_ longPressGestureRecognizer: UILongPressGestureRecognizer) {

    if longPressGestureRecognizer.state == UIGestureRecognizerState.began {

        let touchPoint = longPressGestureRecognizer.location(in: self.view)
        if let indexPath = tableView.indexPathForRow(at: touchPoint) {
            let person = people[indexPath.row]
            print("\(person.name)")
            ///////works but erratic responses//////////
        }
    }
}

//// in view did load i have this


    let longPressGesture:UILongPressGestureRecognizer = UILongPressGestureRecognizer(target: self, action: #selector(PeopleVC.longPress(_:)))
    longPressGesture.minimumPressDuration = 1.0 // 1 second press
    longPressGesture.delegate = self
    self.tableView.addGestureRecognizer(longPressGesture)

Answer 1

改变这个：

interface MyRequestTypeAction{
  void doSomething();
}

Map<Request, MyRequestTypeAction> requestActions = new HashMap<>(){{
   put(TypeAction.TYPE1,()->System.out.printLine("TypeAction.TYPE1"));
   put(TypeAction.TYPE2,()->System.out.printLine("TypeAction.TYPE2"));
   put(TypeAction.TYPE3,()->System.out.printLine("TypeAction.TYPE3"));
   put(OtherTypeAction.OTHERTYPE1,()->System.out.printLine("OtherTypeAction.OTHERTYPE1"));
   put(OtherTypeAction.OTHERTYPE2,()->System.out.printLine("OtherTypeAction.OTHERTYPE2"));
}}

requestActions.get(a_request).doSomething();

对此：

let touchPoint = longPressGestureRecognizer.location(in: self.view)

您正在let touchPoint = longPressGestureRecognizer.location(in: self.tableView) 而非UITableView内寻找手势。