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  • Swift

    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
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  • 原文地址:https://www.cnblogs.com/Free-Thinker/p/4838206.html
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