Swift：UISearchBar：单击搜索按钮时获取文本

Question

我正在玩Swift学习它，现在我无法从UISearchBar获取文本

现在我的代码看起来像这样：

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()
    }
}

Answer 2

1.首先要遵守UISearchbarDelegate。

2.将搜索栏委托设置为self。

你可以在这里找到更多关于Swift iOS tutorial : Implementing search using UISearchBar and UISearchBarDelegate的信息