Swift Firebase UISearchController索引超出范围

Question

我有一个tableview，它列出了firebase中所有的“地方”。我有一个UISearchController显然搜索这些“地方”。问题是，当我点击UISearchController但没有输入任何内容，并选择一个“地点”我得到一个索引超出范围错误。如果我打字或者没有激活UISearchController，它会很好地工作。只是当它处于活动状态而不输入时，当我收到错误时。它抛出的错误“让用户= filteredUsers [indexPath.row]”

override func prepare(for segue: UIStoryboardSegue, sender: Any?) { 
    super.prepare(for: segue, sender: sender) 
    if segue.identifier == "BusinessProfiles" { 
     // gotta check if we're currently searching 
     if self.searchController.isActive { 
      if let indexPath = tableView.indexPathForSelectedRow { 
       let user = filteredUsers[indexPath.row] 
       let controller = segue.destination as? BusinessProfilesViewController 
       controller?.otherUser = user 
      } 
     } else { 
      if let indexPath = tableView.indexPathForSelectedRow { 
       let user = usersArray[indexPath.row] 
       let controller = segue.destination as? BusinessProfilesViewController 
       controller?.otherUser = user 
      } 
     } 
    } 
} 

Answer 1

就像你说的，你没有进行任何搜索和选择的地方，对不对？如果是这样，你可以调用空filteredUsers[indexPath.row]与选定行的indexPath.row，它具有正指数。至于如此，你必须首先检查是否是搜索执行，然后才打电话filteredUsers[indexPath.row]这样的：

if !filteredUsers.isEmpty { 
    if self.searchController.isActive { 
      if let indexPath = tableView.indexPathForSelectedRow { 
       let user = filteredUsers[indexPath.row] 

Answer 2

刚刚将该“& & searchController.searchBar.text =！‘’ ”来纠正我的问题

override func prepare(for segue: UIStoryboardSegue, sender: Any?) { 
    super.prepare(for: segue, sender: sender) 
    if segue.identifier == "BusinessProfiles" { 
     // gotta check if we're currently searching 
     if self.searchController.isActive && searchController.searchBar.text != "" { 
      if let indexPath = tableView.indexPathForSelectedRow { 
       let user = filteredUsers[indexPath.row] 
       let controller = segue.destination as? BusinessProfilesViewController 
       controller?.otherUser = user 
      } 
     } else { 
      if let indexPath = tableView.indexPathForSelectedRow { 
       let user = usersArray[indexPath.row] 
       let controller = segue.destination as? BusinessProfilesViewController 
       controller?.otherUser = user 
      } 
     } 
    } 
}