Question

如何以编程方式创建import urllib import json serviceurl = 'http://python-data.dr-chuck.net/geojson' while True: address = raw_input('Enter location: ') if len(address) < 1 : break url = serviceurl + '?' + urllib.urlencode({'sensor':'false', 'address': address}) print 'Retrieving', url uh = urllib.urlopen(url) data = uh.read() print 'Retrieved',len(data),'characters' try: js = json.loads(str(data)) except: js = None if 'status' not in js or js['status'] != 'OK': print '==== Failure To Retrieve ====' print data continue print json.dumps(js, indent=4) placeid = js['results'][0]['place_id'] print "Place ID: ", placeid print placeid print location重新加载+ UIwebview按钮。

如何调用以下功能

goback/forward

更新了当前代码：

func reload()
func goBack()
func goForward()

Answer 1

根据WebView的Apple文档（https://developer.apple.com/library/mac/documentation/Cocoa/Reference/WebKit/Classes/WebView_Class/）

您可以像这样连接相应的按钮插座：

@IBAction func goBack(sender: AnyObject) {
    self.webView.goBack()
}

@IBAction func reload(sender: AnyObject) {
    self.webView.reload()
}

@IBAction func forward(sender: AnyObject) {
    self.webView.goForward()
}

还要检查canGoBack和canGoForward是否设置为true（只读）。

如果按钮也是以编程方式创建的，您可以添加选择器，例如Selector（＆＃34; goBack＆＃34;）并创建一个func goBack（）{}

对于ObjectiveC，您可以这样做：

- (IBAction)browserGoBack
{
    [self.webView goBack];
}

- (IBAction)browserGoForward
{
    [self.webView goForward];
}

- (IBAction)browserRefresh
{
    [self.webView reload];
}

Answer 2

这是答案

@IBAction func reload(sender: UIBarButtonItem) {

             webview.reload()

        }

@IBAction func back(sender: UIBarButtonItem) {

             webview.goBack()

        }
@IBAction func forward(sender: UIBarButtonItem) {

             webview.goForward()

        }

Answer 3

您可以对按钮操作进行额外检查：

    @IBAction func barBackButtonAction(sender: AnyObject) {
      if webView.canGoBack {
         webView.goBack()
      }

    }


   @IBAction func barForwardButtonAction(sender: AnyObject) {
     if webView.canGoForward{
        webView.goForward()
     }
   }

Answer 4

使用后退，前进，重新加载，停止按钮创建UI Web视图

class ViewController: UIViewController {

@IBOutlet weak var webview1: UIWebView!

override func viewDidLoad() {
    super.viewDidLoad()

    let url = URL(string: "https://www.google.co.in")
    let requestobj = URLRequest(url:url!)
    webview1.loadRequest(requestobj)

    }


@IBAction func back_btn(_ sender: Any) {

    self.webview1.goBack()




}

@IBAction func forward_btn(_ sender: Any) {


    self.webview1.goForward()


}

@IBAction func reload_btn(_ sender: Any) {


    self.webview1.reload()


}
@IBAction func stop_btn(_ sender: Any) {


     self.webview1.stopLoading()

}
}

以编程方式创建UIwebview reload + goback / forward按钮

4 个答案: