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Swift - 使用UIWebView和UIToolbar制作一个浏览器

Swift   发布时间：2022-03-31  发布网站：大佬教程  code.js-code.com
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概述

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
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：
@H_616_48@
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@H_772_419@
import UIKit
class ViewController : UIViewController , UIWebViewDelegate UITextFieldDelegate {
@IBOutlet var btngo: UIButton !
webview: UIWebView !
txturl: UITextField !
loadInDicator: UIActivityInDicatorView !
//进度条计时器
ptimer: NSTimer !
//进度条控件
@H_192_502@progBar: UIProgressview !
override func viewDidLoad() {
super .viewDidLoad()
// Do any additional setup after loading the view,typically from a nib.
self .webview.delegate = ;
loadInDicator = UIActivityInDicatorView (frame: CGRectMake (100.0,100.0,32.0,32.0));
loadInDicator.activityInDicatorViewStyle = UIActivityInDicatorViewStyle . Gray
.view.addSubview(loadInDicator);
txturl.delegate = self
//构建浏览器工具条
setupBrowserToolbar()
}
setupBrowserToolbar()
{
// 创建一个浏览器工具条，并设置它的大小和位置
@H_801_581@let browserToolbar = UIToolbar (frame: CGRectMake (0,320,44))
// 将工具条添加到当前应用的界面中
.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
path = NSBundle .mainBundle().pathForresource( "BACk" :1.5em!important; margin:0px!important; overflow:visible!important; padding:1px 0px!important; position:static!important; right:auto!important; top:auto!important; vertical-align:baseline!important; width:auto!important; font-family:Consolas,ofType: "png" )
@H_568_616@
@H_712_618@urlStr = NSURL .fileURLWithPath(path!);
data = NSData (contentsOfURL:urlStr);
btnBACk = UIBarButtonItem (image: UIImage (data: data!),
style:. Plain :1.5em!important; margin:0px!important; overflow:visible!important; padding:1px 0px!important; position:static!important; right:auto!important; top:auto!important; vertical-align:baseline!important; width:auto!important; font-family:Consolas,target: :1.5em!important; margin:0px!important; overflow:visible!important; padding:1px 0px!important; position:static!important; right:auto!important; top:auto!important; vertical-align:baseline!important; width:auto!important; font-family:Consolas,action: SELEctor ( "BACkClicked:" ));
@H_419_682@//第一个分隔按钮
btngap1 = UIBarButtonItem (barButtonSy@R_301_2407@Item:. FlexibleSpace :1.5em!important; margin:0px!important; overflow:visible!important; padding:1px 0px!important; position:static!important; right:auto!important; top:auto!important; vertical-align:baseline!important; width:auto!important; font-family:Consolas,
target: nil :1.5em!important; margin:0px!important; overflow:visible!important; padding:1px 0px!important; position:static!important; right:auto!important; top:auto!important; vertical-align:baseline!important; width:auto!important; font-family:Consolas,
action: );
@H_627_675@// 创建前进按钮 UIBarButtonItem
btnforWARD = (named: "forWARD.png" ),
"forWARDClicked:" ));
// 第二个分隔按钮，创建一个可伸缩的UIBarButtonItem
btngap2 = :1.5em!important; margin:0px!important; overflow:visible!important; padding:1px 0px!important; position:static!important; right:auto!important; top:auto!important; vertical-align:baseline!important; width:auto!important; font-family:Consolas,
675_10793@er56="" index55="" alt1"="" style="outline:0px!important; border:0px!important; bottom:auto!important; float:none!important; height:auto!important; left:auto!important; line-height:1.5em!important; margin:0px!important; overflow:visible!important; padding:0px 1em!important; position:static!important; right:auto!important; top:auto!important; vertical-align:baseline!important; width:auto!important; min-height:auto!important; BACkground:none rgb(249,
);
// 创建重新加载按钮 UIBarButtonItem
btnreload = "reload.png" :1.5em!important; margin:0px!important; overflow:visible!important; padding:1px 0px!important; position:static!important; right:auto!important; top:auto!important; vertical-align:baseline!important; width:auto!important; font-family:Consolas,
"reloadClicked:" ));
//第三个分隔按钮
btngap3 = :1.5em!important; margin:0px!important; overflow:visible!important; padding:1px 0px!important; position:static!important; right:auto!important; top:auto!important; vertical-align:baseline!important; width:auto!important; font-family:Consolas,
675_10793@er65="" index64="" alt2"="" style="outline:0px!important; border:0px!important; bottom:auto!important; float:none!important; height:auto!important; left:auto!important; line-height:1.5em!important; margin:0px!important; overflow:visible!important; padding:0px 1em!important; position:static!important; right:auto!important; top:auto!important; vertical-align:baseline!important; width:auto!important; min-height:auto!important; BACkground:none rgb(249,
);
//创建加载停止按钮
btnstop = "stop" :1.5em!important; margin:0px!important; overflow:visible!important; padding:1px 0px!important; position:static!important; right:auto!important; top:auto!important; vertical-align:baseline!important; width:auto!important; font-family:Consolas,
"stopClicked:" ));
//第四个分隔按钮
btngap4 = :1.5em!important; margin:0px!important; overflow:visible!important; padding:1px 0px!important; position:static!important; right:auto!important; top:auto!important; vertical-align:baseline!important; width:auto!important; font-family:Consolas,
675_10793@er74="" index73="" alt1"="" style="outline:0px!important; border:0px!important; bottom:auto!important; float:none!important; height:auto!important; left:auto!important; line-height:1.5em!important; margin:0px!important; overflow:visible!important; padding:0px 1em!important; position:static!important; right:auto!important; top:auto!important; vertical-align:baseline!important; width:auto!important; min-height:auto!important; BACkground:none rgb(249,
);
//创建进度工具条
progBar = UIProgressview (progressviewStyle: UIProgressviewStyle Bar )
// 设置UIProgressview的大小
progBar.frame = :1.5em!important; margin:0px!important; overflow:visible!important; padding:1px 0px!important; position:static!important; right:auto!important; top:auto!important; vertical-align:baseline!important; width:auto!important; font-family:Consolas,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
btnprog = (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,
675_10793@er95 index94 alt2" style="outline:0px!important; border:0px!important; bottom:auto!important; float:none!important; height:auto!important; left:auto!important; line-height:1.5em!important; margin:0px!important; overflow:visible!important; padding:0px 1em!important; position:static!important; right:auto!important; top:auto!important; vertical-align:baseline!important; width:auto!important; min-height:auto!important; BACkground:none rgb(249,SELEctor: "loadProgress" :1.5em!important; margin:0px!important; overflow:visible!important; padding:1px 0px!important; position:static!important; right:auto!important; top:auto!important; vertical-align:baseline!important; width:auto!important; font-family:Consolas,
userInfo: :1.5em!important; margin:0px!important; overflow:visible!important; padding:1px 0px!important; position:static!important; right:auto!important; top:auto!important; vertical-align:baseline!important; width:auto!important; font-family:Consolas,repeats: );
ptimer.invalidate()
}
textFieldShouldReturn(textField: ) -> Bool
{
txturl.resignFirstResponder()
print "url Changed!" )
url = txturl.text;
loadUrl(url!)
return true
}
/*
在 UIWebView 加载指定 URL
*/
loadUrl(url: String )
{
urlobj = (String:url)
request = NSURLrequest ( URL :urlobj!)
webview.loadrequest(request);
@H_616_891@}
stopClicked(sender: )
{
webview.stopLoading()
}
reloadClicked(sender: )
{
webview.reload()
}
BACkClicked(sender: )
{
webview.goBACk()
}
@H_450_929@
forWARDClicked(sender: )
{
webview.goForWARD()
}
@IBACtion goClicked(sender: )
{
//收起输入面板
txturl.resignFirstResponder()
url = txturl.text;
loadUrl(url!)
}
didReceiveMemoryWarning() {
.didReceiveMemoryWarning()
}
webViewDidStartLoad(webView: UIWebView )
{
progBar.setProgress(0,153)!important; BACkground:none!important">false );
ptimer.fire();
loadInDicator.startAnimaTing();
}
webViewDidFinishLoad(webView: )
{
loadInDicator.stopAnimaTing();
progBar.setProgress(1,monospace!important; min-height:auto!important; BACkground:none!important">);
ptimer.invalidate();
}
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,monospace!important; min-height:auto!important; BACkground:none!important">);
}
}
webView(webView: :1.5em!important; margin:0px!important; overflow:visible!important; padding:1px 0px!important; position:static!important; right:auto!important; top:auto!important; vertical-align:baseline!important; width:auto!important; font-family:Consolas,didFailLoadWithError error: NSError ?)
{
alertController = UIAlertController (title: "出错!" :1.5em!important; margin:0px!important; overflow:visible!important; padding:1px 0px!important; position:static!important; right:auto!important; top:auto!important; vertical-align:baseline!important; width:auto!important; font-family:Consolas,
message: error!.localizedDescription,
@H_878_1058@preferredStyle: UIAlertControllerStyle Alert )
okAction = UIAlertAction "确定" :1.5em!important; margin:0px!important; overflow:visible!important; padding:1px 0px!important; position:static!important; right:auto!important; top:auto!important; vertical-align:baseline!important; width:auto!important; font-family:Consolas,style: UIAlertActionStyle Cancel :1.5em!important; margin:0px!important; overflow:visible!important; padding:1px 0px!important; position:static!important; right:auto!important; top:auto!important; vertical-align:baseline!important; width:auto!important; font-family:Consolas,
handler: )
alertController.addAction(okAction)
.presentViewController(alertController,completion: )
}
}

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