ios - Swift:无法将类型 '[Any]' 的值转换为指定类型 'NSString'

Question

一般:我有一个 Collection View 应用程序，其中包含来自多个 plist 的多个项目，具体取决于用户选择的项目。 plist 是一个包含多个数组的数组，每个数组中包含多个字符串。

问题:在执行搜索栏以搜索我的收藏(或 plist)时，我在遵循教程时遇到此错误。

我知道这个搜索条码是为了寻找一个字符串，而不是 plist 中另一个数组中的数组中的字符串。所以我正在寻求帮助来修复我的错误和代码。

错误:

Cannot convert value of type '[Any]' to specified type 'NSString'

这是导致错误的代码。

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

    filtered = car.filter({ (text) -> Bool in
        let tmp: NSString = text // <-- ** Error is here **
        let range = tmp.range(of: searchText, options: NSString.CompareOptions.caseInsensitive)
        return range.location != NSNotFound
    })

    if(filtered.count == 0){
        searchActive = false;
    } else {
        searchActive = true;
    }

    self.finalCollectView.reloadData()
}

SearchBar 的其余代码

func createSearchBar() {

    let mySearchBar = UISearchBar()
    mySearchBar.showsCancelButton = false
    mySearchBar.placeholder = "Search"
    mySearchBar.delegate = self
    mySearchBar.alpha = 1
    mySearchBar.tintColor = UIColor.black
    mySearchBar.searchFieldBackgroundPositionAdjustment = UIOffset(horizontal: 5, vertical: 0)

    self.navigationItem.titleView = mySearchBar
}

func searchBarTextDidBeginEditing(_ searchBar: UISearchBar) {
    searchActive = true;
}

func searchBarTextDidEndEditing(_ searchBar: UISearchBar) {
    searchActive = false;
}

func searchBarCancelButtonClicked(_ searchBar: UISearchBar) {
    searchActive = false;
}

func searchBarSearchButtonClicked(_ searchBar: UISearchBar) {
    searchActive = false;
}

plist 代码

var filtered = [[Any]]()
var searchActive: Bool = false
var car = [[Any]]()
@IBOutlet weak var finalCollectView: UICollectionView!

override func viewDidLoad() {
    super.viewDidLoad()

    self.finalCollectView.delegate = self
    self.finalCollectView.dataSource = self

    readList(titlePlist: "car")
}

func readList(titlePlist: String) {

    let url = Bundle.main.url(forResource: titlePlist, withExtension: "plist")!
    do {
        let data = try Data(contentsOf:url)
        let sections = try PropertyListSerialization.propertyList(from: data, format: nil) as! [[Any]]

        car = sections

    } catch {
        print("This error must never occur: Reading plist", error)
    }

plist 的样子

<plist> 
    <array>
        <array>
            <string>Name1</string>
            <string>Description</string>
        </array>
        <array>
            <string>Name2</string>
            <string>Description</string>
        </array>
        <array>
            <string>Name3</string>
            <string>Description</string>
        </array>
    </array>
</plist>

搜索栏需要搜索每个数组中的第一个字符串。谢谢!

Answer 1

在你的func searchBar(_ searchBar: UISearchBar, textDidChange searchText: String)中，将过滤修改为:

filtered = car.filter({ (anArray) -> Bool in
    guard let firstString = (anArray.first as? String) else{
       return false
    }
    let tmp: NSString = firstString as NSString
    let range = tmp.range(of: searchText, options: NSString.CompareOptions.caseInsensitive)
    return range.location != NSNotFound
})