'x' 类型的值没有成员“小写”

Question

我正在尝试在我的 table 视图中实现搜索栏。但我收到这个错误类型 'getUserData' 的值在此代码

上没有成员 'lowercased'

filteredDataBySearch = dataSourceArray.filter({ (data:String) -> Bool in
    return data.lowercased().rangeOfString(searchText.lowercased()) != nil
})

这是我的代码：

@IBOutlet weak var FSuserLIst: UITableView!
var dataSourceArray1 = [getUserData]()
var dataSourceArray2 = [getUserData]()
var dataSourceArray3 = [getUserData]()
var dataSourceArray4 = [getUserData]()
let searchBar = UISearchBar()
var showSearchResults = false
var filteredDataBySearch = [getUserData]()

这是我的搜索功能

func searchBarSearchButtonClicked(_ searchBar: UISearchBar) {

    showSearchResults = true
    searchBar.endEditing(true)
    self.FSuserLIst.reloadData()

}

func searchBar(searchBar: UISearchBar, textDidChange searchText: String) {

    if segmentedData.selectedSegmentIndex == 0 {

        filteredDataBySearch = dataSourceArray.filter({ (data:String) -> Bool in

            return data.lowercased().rangeOfString(searchText.lowercased()) != nil
        })

        if searchText != "" {

            showSearchResults = true
            self.FSuserLIst.reloadData()
        } else {
            showSearchResults = false
            self.FSuserLIst.reloadData()
        }
    }

    else if segmentedData.selectedSegmentIndex == 1 {

        filteredDataBySearch = dataSourceArray1.filter({ (data:String) -> Bool in

            return data.lowercased().rangeOfString(searchText.lowercased()) != nil
        })

        if searchText != "" {

            showSearchResults = true
            self.FSuserLIst.reloadData()
        } else {
            showSearchResults = false
            self.FSuserLIst.reloadData()
        }
    }

    else if segmentedData.selectedSegmentIndex == 2 {

        filteredDataBySearch = dataSourceArray2.filter({ (data:String) -> Bool in

            return data.lowercased().rangeOfString(searchText.lowercased()) != nil
        })

        if searchText != "" {

            showSearchResults = true
            self.FSuserLIst.reloadData()
        } else {
            showSearchResults = false
            self.FSuserLIst.reloadData()
        }
    }

  else if segmentedData.selectedSegmentIndex == 3 {

        filteredDataBySearch = dataSourceArray3.filter({ (data:String) -> Bool in

            return data.lowercased().rangeOfString(searchText.lowercased()) != nil
        })

        if searchText != "" {

            showSearchResults = true
            self.FSuserLIst.reloadData()
        } else {
            showSearchResults = false
            self.FSuserLIst.reloadData()
        }
    }
}

"getUserData" 是具有超过 10 个变量的 class，它位于另一个 swift 文件中。

非常感谢任何帮助，谢谢。

Answer 1

您正在尝试将 getUserData class 转换为小写。您想要访问此 class 中的字符串，然后将其转换。我还没有测试过这个，但你正在寻找类似的东西。

filteredDataBySearch = dataSourceArray.filter({ (userData:MyUserDataClass) -> Bool in

    let data = userData.myStringInThisClass.lowercased()

    return data.contains(searchText.lowercased())
})

这将在 class 中获取一个字符串变量并将其转换为小写。

作为旁注，典型的约定是使用大写字母作为 class 名称，即。 MyClass

'x' 类型的值没有成员“小写”

Value of type 'x' has no member 'lowercased

xcode

ios

swift

swift4

xcode9.4