After longpress, UITableViewCell need two clicks to get selected

Question

I'm implementing long press in UITableViewCell using following code. Everything works fine except that when long press is over I have to click two times on a cell to select it.

UILongPressGestureRecognizer *longPress = [[UILongPressGestureRecognizer alloc] initWithTarget:self action:@selector(handleLongPress:)];
longPress.minimumPressDuration = 0.5;
longPress.delegate = self;
[cell addGestureRecognizer:longPress];

Does anybody knows the reason behind this behavior ? Thanks.