ios - 单击指定单元格后获取搜索栏占位符中的 TableView 单元格文本值

Question

我的ViewController包含一个表格 View 。我正在从 JSON 获取数据，并且已经能够在我的表格 View 单元格中显示该值。还有用于过滤目的的搜索栏。

我想将我的表格 View 单元格文本作为我的搜索栏
单击该特定单元格时的占位符。

我希望在单击该特定单元格时将 Baramunda 作为我的占位符文本。

我的代码如下。

func searchBar(){

    let searchBar = UISearchBar(frame: CGRect(x: 0, y: 0, width: self.view.frame.width, height: 50));
    searchBar.delegate = self
    searchBar.showsScopeBar = true
    searchBar.tintColor = UIColor.green
    self.view .addSubview(searchBar)
}
func searchBar(_ searchBar: UISearchBar, textDidChange searchText: String) {
    if searchText == ""
    {
        tableView.alpha = 0.0
        searchBar.placeholder = "Search Location Here"
        parseData()
    }
    else {

        if searchBar.selectedScopeButtonIndex  == 0 {
            tableView.alpha = 1.0
            areaNameArr = areaNameArr.filter({ (anyobject) -> Bool in
                return (anyobject.lowercased.contains(searchText.lowercased()))
            })

        }
        else {
            print("Do Nothing")
        }
    }
    self.tableView.reloadData()
}


public func tableView(_ tableView: UITableView, numberOfRowsInSection section: Int) -> Int

{

    return areaNameArr.count

}



public func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell

{
     let cell = tableView.dequeueReusableCell(withIdentifier: "cell" )
    cell?.backgroundColor = UIColor .black
    cell?.textLabel?.textColor = UIColor .white
    cell?.textLabel?.text = areaNameArr[indexPath.row] as? String
    return cell!
}

Answer 1

您需要将 searchBar 变量声明为全局变量，以便在函数 searchBar() 外部进行访问。

class ViewController: UIViewController{
let searchBar = UISearchBar()
 override func viewDidLoad() {
 super.viewDidLoad()
    // Do any additional setup after loading the view, typically from a nib.
   //here goes your code of viewDidLoad
}
//This is your function for creating search bar ,only first line is changed and rest is same
func searchBar(){
searchBar.frame(forAlignmentRect: CGRect(x: 0, y: 0, width: self.view.frame.width, height: 50))
searchBar.delegate = self
searchBar.showsScopeBar = true
searchBar.tintColor = UIColor.green
self.view .addSubview(searchBar)
}
}
// this delegate method is called when cell is tapped
// remember to connect delegate from storyboard or you can use self.tableView.delegate = self
func tableView(_ tableView: UITableView, didSelectRowAt indexPath: IndexPath) {
    //here get the text from tapped cell index
    let tappedCellText = areaNameArr[indexPath.row] as? String
    // here set placeholder
    searchBar.placeholder = tappedCellText
    // when cell is clicked you need to set text of search bar to nil or blank otherwise you would not be able to see placeholder text because some text is already there in search bar
     searchBar.text = ""
    // if you don't cleanup text from search bar you will be required to delete text from search bar manually to see placeholder text
}

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