ios - Swift:UISearchBar:单击搜索按钮时获取文本

Question

我正在尝试使用 Swift 来学习它，但现在我无法从 UISearchBar

获取文本

现在我的代码是这样的:

import UIKit

class SecondViewController: UIViewController {

    @IBOutlet var myWebView : UIWebView
    @IBOutlet var adressbar: UISearchBar

    override func viewDidLoad() {
        super.viewDidLoad()

        adressbar.showsScopeBar = true

        var url = NSURL(string: "http://google.com")
        var request = NSURLRequest(URL: url)

        myWebView.scalesPageToFit = true
        myWebView.loadRequest(request)
    }

    func searchBarSearchButtonClicked( searchBar: UISearchBar!) {

        var url = NSURL(string: adressbar.text)
        var request = NSURLRequest(URL: url)

        myWebView.scalesPageToFit = true
        myWebView.loadRequest(request)
    }

    override func didReceiveMemoryWarning() {
        super.didReceiveMemoryWarning()
    }
}

Answer 1

在 viewDidLoad 中，您必须将搜索栏的委托(delegate)设置为从中接收 searchBarSearchButtonClicked:

import UIKit

class SecondViewController: UIViewController, UISearchBarDelegate
{
    @IBOutlet var myWebView : UIWebView
    @IBOutlet var adressbar: UISearchBar

    override func viewDidLoad()
    {
        super.viewDidLoad()

        adressbar.showsScopeBar = true
        adressbar.delegate = self

        var url = NSURL(string: "http://google.com")
        var request = NSURLRequest(URL: url)

        myWebView.scalesPageToFit = true
        myWebView.loadRequest(request)
    }

    func searchBarSearchButtonClicked( searchBar: UISearchBar!)
    {
        var url = NSURL(string: searchBar.text)
        var request = NSURLRequest(URL: url)

        myWebView.scalesPageToFit = true
        myWebView.loadRequest(request)
    }

    override func didReceiveMemoryWarning()
    {
        super.didReceiveMemoryWarning()
    }
}