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:
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 | 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