Question

我使用以下教程让我的用户搜索“位置”，然后表视图将根据搜索文本过滤结果。我甚至添加了“范围”，因此用户可以在“全部”和“食物”之类的东西之间进行过滤。这非常有效。然而问题是，它说在搜索栏下面的食物范围选项卡上，搜索栏文本为空，它将默认返回显示所有结果，即使我只是想让它显示所有的食物结果，而不是全部全部结果。其他范围（公共汽车和停车）也会出现同样的问题。当我开始输入时，它可以工作（将从Food范围获取结果）。如果文本为空而不是当前正在发生的事情，我怎样才能显示所有的Food范围结果（即使我在Food scape选项卡上显示所有范围）？

Ray Weinerlich Tutorial

以下是我的代码的相关部分......

    override func viewDidLoad() {
        super.viewDidLoad()

        searchController.searchBar.scopeButtonTitles = ["All", "Food", "Bus", "Parking"]
        tableView.tableHeaderView = searchController.searchBar
    }

    override func tableView(tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
        if searchController.active && searchController.searchBar.text != "" {
            return filteredLocations.count
        }
        return locations.count
    }

    override func tableView(tableView: UITableView, cellForRowAtIndexPath indexPath: NSIndexPath) -> UITableViewCell {
        if let cell = tableView.dequeueReusableCellWithIdentifier("campusLocationCell", forIndexPath: indexPath) as? CampusLocationTableViewCell {

            let location: Location
            if searchController.active && searchController.searchBar.text != "" {
                location = filteredLocations[indexPath.row]
            } else {
                location = locations[indexPath.row]
            }

            cell.configureCampusLocationCell(location.locationName, locationLatitude: location.locationLatitude, locationLongitude: location.locationLongitude)

            return cell
        } else {
            return CampusLocationTableViewCell()
        }
    }

    func filterContentForSearchText(searchText: String, scope: String = "All") {
        filteredLocations = locations.filter({( location : Location) -> Bool in
            let categoryMatch = (scope == "All") || (location.locationCategory == scope)
            return categoryMatch && location.locationName.lowercaseString.containsString(searchText.lowercaseString)
        })
        tableView.reloadData()
    }

...扩展

extension CampusLocationsViewController: UISearchBarDelegate {
    func searchBar(searchBar: UISearchBar, selectedScopeButtonIndexDidChange selectedScope: Int) {
        filterContentForSearchText(searchBar.text!, scope: searchBar.scopeButtonTitles![selectedScope])
    }
}

extension CampusLocationsViewController: UISearchResultsUpdating {
    func updateSearchResultsForSearchController(searchController: UISearchController) {
        let searchBar = searchController.searchBar
        let scope = searchBar.scopeButtonTitles![searchBar.selectedScopeButtonIndex]
        filterContentForSearchText(searchController.searchBar.text!, scope: scope)
    }
}

当文本为空时，我的过滤搜索栏结果怎么会超出范围？

0 个答案: