Question

我的项目设置如下：

我有一个自定义标签导航控制器。在自定义选项卡导航控制器的顶部栏中是一个文本字段。此文本字段根据应用程序的4个主视图（4个选项卡按钮）更改。

我想要做的是将文本字段用作搜索栏，方法是将输入文本字段的内容传递给searchView但是，我无法将textfield.text从导航控制器传递到searchView。我在下面有一张图片，更清楚地说明了这一点。

searchView具有搜索功能。我想要做的就是在每次更改时将textfieled.text值传递给searchView

Answer 1

你可以做那样的事情。在你的FirstViewController

中

 func textFieldDidChange(textField: UITextField){

   let search_screen = SearchViewController()
   search_screen.search_string = self.textField.text
   self.navigationController?.pushViewController(search_screen, animated: true)
}

如果是故事板

override func prepareForSegue(segue: UIStoryboardSegue, sender: AnyObject?) 
{    
    if (segue.identifier == "Your_SearchViewController_identifier") {
        let search_screen = segue.destinationViewController as! 
         SearchViewController 
        search_screen.search_string = self.textField.text           
    }

}

在你的SeacrchViewController＆＃39; s viewDidLoad:

中

 override func viewDidLoad() {
    super.viewDidLoad()
    self.textField.text = self.search_string
 }

Answer 2

// global 
let handleTextChangeNotification = "handleTextChangeNotification"

您的FirstViewController

override func viewDidLoad() {
      super.viewDidLoad()
      textField.addTarget(self, action: #selector(textFieldDidChange(_:)), for: .editingChanged)
}


func textFieldDidChange(textField: UITextField){
       NotificationCenter.default.post(name: NSNotification.Name(rawValue: handleTextChangeNotification), object: nil, userInfo: ["text":textField.text])
       let search_screen = SearchViewController()

       self.navigationController?.pushViewController(search_screen, animated: true)
    }

SeacrchViewController的

 override func viewDidLoad() {
    super.viewDidLoad()
    NotificationCenter.default.addObserver(self,
                                           selector: #selector(SeacrchViewController.handleTextChange(_:)),
                                           name: NSNotification.Name(rawValue: handleTextChangeNotification),
                                           object: nil)
 }

func handleTextChange(_ myNot: Notification) {
   if let use = myNot.userInfo {
       if let text = use["text"] {
                 // your search with 'text' value
            }
       }
    }
}

在Swift 3 Xcode 8中使用Textfield作为搜索栏

2 个答案: