Question

我有一个tableview，列出了我所有的＆＃34;地点＆＃34;来自firebase。我有一个UISearchController来显然搜索这些＆＃34;地点＆＃34;。问题是当我点击UISearchController但没有输入任何内容并选择一个＆＃34;地点＆＃34;我得到索引超出范围错误。如果我正在键入或未激活UISearchController，它就会很好。就在它处于活动状态时，不输入就是我收到错误的时候。它会在＆＃34; let user = filteredUsers [indexPath.row]＆＃34;

上抛出错误

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

正如你所说，你没有进行任何搜索并选择一个地方，对吗？如果是这样，则使用所选行的indexPath.row调用空filteredUsers[indexPath.row]，该行具有正索引。因此，您必须先检查搜索是否已执行，然后再调用filteredUsers[indexPath.row]，如下所示：

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

Answer 2

刚添加了这个“＆amp;＆amp; searchController.searchBar.text！=”“ “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
            }
        }
    }
}

Swift Firebase UISearchController索引超出范围

2 个答案: