Swift - 使用UIWebView和UIToolbar制作一个浏览器

使用网页控件（UIWebView）与工具栏控件（UIToolbar），我们可以自制一个小型的浏览器，其功能如下：

1，输入网址，点击“Go”按钮加载网页

2，加载过程中有进度条，同时可以点击停止按钮取消加载

3，有页面刷新按钮

4，有前进后退按钮

 

效果图如下：

代码如下：

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class ViewController: UIViewController, UIWebViewDelegate,UITextFieldDelegate {           @IBOutlet var btngo:UIButton!     @IBOutlet var webview:UIWebView!     @IBOutlet var txturl:UITextField!     var loadIndicator:UIActivityIndicatorView!           //进度条计时器     var ptimer:NSTimer!     //进度条控件     var progBar:UIProgressView!           override func viewDidLoad() {         super.viewDidLoad()         // Do any additional setup after loading the view, typically from a nib.                   self.webview.delegate = self;         loadIndicator = UIActivityIndicatorView(frame: CGRectMake(100.0, 100.0, 32.0, 32.0));         loadIndicator.activityIndicatorViewStyle = UIActivityIndicatorViewStyle.Gray         self.view.addSubview(loadIndicator);                   txturl.delegate = self                             //构建浏览器工具条         setupBrowserToolbar()     }           func setupBrowserToolbar()     {         // 创建一个浏览器工具条，并设置它的大小和位置         var browserToolbar =  UIToolbar(frame:CGRectMake(0, 20, 320, 44))                   // 将工具条添加到当前应用的界面中         self.view.addSubview(browserToolbar)                   //创建图片工具条，但是不是直接使用文件名，而是用 NSData 方式初始化 UIImage         var path = NSBundle.mainBundle().pathForResource("back", ofType:"png")                   var urlStr = NSURL.fileURLWithPath(path!);         var data = NSData(contentsOfURL:urlStr!);         var btnback =  UIBarButtonItem(image:UIImage(data: data!),           style:UIBarButtonItemStyle.Bordered, target:self,action:Selector("backClicked:"));         //第一个分隔按钮         var btngap1 =  UIBarButtonItem(barButtonSystemItem:UIBarButtonSystemItem.FlexibleSpace,             target:nil,             action:nil);         // 创建前进按钮 UIBarButtonItem         var btnforward = UIBarButtonItem(image:UIImage(named:"forward.png"),           style:UIBarButtonItemStyle.Plain, target:self, action:Selector("forwardClicked:"));                   // 第二个分隔按钮，创建一个可伸缩的UIBarButtonItem         var btngap2 =  UIBarButtonItem(barButtonSystemItem:UIBarButtonSystemItem.FlexibleSpace,             target:nil,             action:nil);                   // 创建重新加载按钮 UIBarButtonItem         var btnreload = UIBarButtonItem(image:UIImage(named:"reload.png"),           style:UIBarButtonItemStyle.Plain, target:self, action:Selector("reloadClicked:"));                   //第三个分隔按钮         var btngap3 =  UIBarButtonItem(barButtonSystemItem:UIBarButtonSystemItem.FlexibleSpace,             target:nil,             action:nil);                   //创建加载停止按钮         var btnstop = UIBarButtonItem(image:UIImage(named:"stop"),           style:UIBarButtonItemStyle.Plain, target:self, action:Selector("stopClicked:"));                   //第四个分隔按钮         var btngap4 =  UIBarButtonItem(barButtonSystemItem:UIBarButtonSystemItem.FlexibleSpace,             target:nil,             action:nil);                   //创建进度工具条         progBar = UIProgressView(progressViewStyle:UIProgressViewStyle.Bar)                   // 设置UIProgressView的大小         progBar.frame = CGRectMake(0 , 0 , 80, 20)                   // 设置该进度条的初始进度为0         progBar.progress = 0                   // 创建使用 UIView 的自定义的 UIBarButtonItem         var btnprog =  UIBarButtonItem(customView:progBar)                   // 为工具条设置工具按钮         browserToolbar.setItems( [btnback,btngap1, btnforward,btngap2,           btnreload,btngap3, btnstop,btngap4, btnprog ], animated:true)                   //创建计时器对象         ptimer = NSTimer.scheduledTimerWithTimeInterval(0.2,             target:self ,selector: Selector("loadProgress"),             userInfo:nil,repeats:true);         ptimer.invalidate()     }           func textFieldShouldReturn(textField:UITextField) -> Bool     {         txturl.resignFirstResponder()         println("url Changed!")         var url = txturl.text;         loadUrl(url)         return true     }     /*         在 UIWebView 加载指定 URL     */     func loadUrl(url:String)     {         var urlobj = NSURL(string:url)                   var request = NSURLRequest(URL:urlobj!)                   webview.loadRequest(request);     }           func stopClicked(sender:UIBarButtonItem)     {         webview.stopLoading()     }           func reloadClicked(sender:UIBarButtonItem)     {         webview.reload()     }           func backClicked(sender:UIBarButtonItem)     {         webview.goBack()     }           func forwardClicked(sender:UIBarButtonItem)     {         webview.goForward()     }           @IBAction func goClicked(sender:UIButton)     {         //收起输入面板         txturl.resignFirstResponder()         var url = txturl.text;         loadUrl(url)     }           override func didReceiveMemoryWarning() {         super.didReceiveMemoryWarning()         // Dispose of any resources that can be recreated.     }                 func webViewDidStartLoad(webView:UIWebView)     {         progBar.setProgress(0, animated:false);         ptimer.fire();         loadIndicator.startAnimating();     }     func webViewDidFinishLoad(webView:UIWebView)     {         loadIndicator.stopAnimating();         progBar.setProgress(1, animated:true);         ptimer.invalidate();     }     func loadProgress()     {         // 如果进度满了，停止计时器         if(progBar.progress >= 1.0)         {             // 停用计时器             ptimer.invalidate();         }         else         {             // 改变进度条的进度值             progBar.setProgress(progBar.progress + 0.02, animated:true);         }     }           func webView(webView: UIWebView!, didFailLoadWithError error: NSError!)     {         var alertview = UIAlertView();         alertview.title = "出错!"         alertview.message = error.localizedDescription;         alertview.addButtonWithTitle("确定")         alertview.show();     }   }

源代码下载：使用UIWebView制作一个浏览器.zip