不能更改searchBar的颜色，选择时会跳到视图顶部

Question

我试图将搜索栏附加到tableView的顶部并更改其属性（例如颜色，占位符）。但是，我不知道如何。我尝试将tableView嵌入另一个视图中，但这没有帮助。有什么想法吗？

func setupSearch(){
        search.delegate = self
        search.automaticallyShowsCancelButton = false
        search.searchBar.tintColor = UIColor.red
        search.searchBar.barTintColor = UIColor.red
        search.obscuresBackgroundDuringPresentation = false
        search.hidesNavigationBarDuringPresentation = false
        search.searchBar.placeholder = "Type something here to search"
        navigationItem.searchController = search
        tableView.tableHeaderView = search.searchBar
    }

此函数在viewDidLoad（）中调用，并且添加了tableView，但没有正确的颜色或占位符，并且在选定时跳转到屏幕顶部。任何帮助，将不胜感激。

Answer 1

override func viewDidLoad() {
    super.viewDidLoad()

  setupSearch()
 NotificationCenter.default.addObserver(self, selector: #selector(keyboardWillShow), name: UIResponder.keyboardWillShowNotification, object: nil)

   }


@objc func keyboardWillShow(notification: NSNotification) {
   tableView.frame.origin.y = 0

}


 func setupSearch(){
 let textFieldSearchBar = searchBar.value(forKey: "searchField") as? UITextField
  textFieldSearchBar?.textColor = .red

  let searchBarLabel = textFieldSearchBar!.value(forKey: "placeholderLabel") as? UILabel
  textFieldSearchBarLabel?.textColor = .red

 }