基本用法示例
- (void)viewDidLoad{ [super viewDidLoad]; // Do any additional setup after loading the view. UIWebView * webView = [[UIWebView alloc]initWithFrame:CGRectMake(0, 20, ScreenWidth, ScreenHeight-20)]; // 自動隊頁面進行縮放以適應屏幕 webView.scalesPageToFit = YES; webView.userInteractionEnabled = YES; webView.opaque = YES; [self.view addSubview:webView]; NSURL * url = [NSURL URLWithString:@"http://www.youku.com"]; NSURLRequest * request = [NSURLRequest requestWithURL:url]; [webView loadRequest:request];// NSString * myHT = @"優酷";// [webView loadHTMLString:myHT baseURL:url];/* [webView goBack]; // 返回 [webView goForward]; // 前往 [webView reload]; [webView stopLoading]; */ webView.delegate = self; //移除滾動后的外邊陰影 UIScrollView *scrollView = webView.scrollView; for (int i = 0; i < scrollView.subviews.count ; i++) { UIView *view = [scrollView.subviews objectAtIndex:i]; if ([view isKindOfClass:[UIImageView class]]) { view.hidden = YES ; } }}#pragma mark - UIWebViewDelegate- (BOOL)webView:(UIWebView *)webView shouldStartLoadWithRequest:(NSURLRequest *)request navigationType:(UIWebViewNavigationType)navigationType{ /** * typedef NS_ENUM(NSInteger, UIWebViewNavigationType) { * UIWebViewNavigationTypeLinkClicked, * UIWebViewNavigationTypeFormSubmitted, * UIWebViewNavigationTypeBackForward, * UIWebViewNavigationTypeReload, * UIWebViewNavigationTypeFormResubmitted, * UIWebViewNavigationTypeOther }; */ NSLOG_FUNCTION; return YES;}// 開始加載- (void)webViewDidStartLoad:(UIWebView *)webView{ NSLOG_FUNCTION;}// 完成加載- (void)webViewDidFinishLoad:(UIWebView *)webView{ NSLOG_FUNCTION;}// 加載失敗,彈出錯誤提示- (void)webView:(UIWebView *)webView didFailLoadWithError:(NSError *)error{ UIAlertView *alterview = [[UIAlertView alloc] initWithTitle:@"" message:[error localizedDescription] delegate:nil cancelButtonTitle:nil otherButtonTitles:@"OK", nil]; [alterview show]; [alterview release]; NSLOG_FUNCTION;}
以下是關于它的一些使用技巧：
1.讓網頁適應手機屏幕寬度
如果用UIWebView顯示一些pc站的網頁，會發現網頁會超出屏幕，顯得很不好看，這時可以在webViewDidFinishLoad這個代理里面通過js添加一個meta：
- (void)webViewDidFinishLoad:(UIWebView *)webView{ NSString *meta = [NSString stringWithFormat:@"document.getElementsByName(/"viewport/")[0].content = /"width=%f, initial-scale=1.0, minimum-scale=1.0, maximum-scale=1.0, user-scalable=no/"", IPHONE_WIDTH]; [webView stringByEvaluatingJavaScriptFromString:meta];}注意：使用這個方法時要把UIWebView的scalesPageToFit設成NO
webView.scalesPageToFit = NO;
2.為網頁中的圖片添加點擊事件，當點擊圖片時放大查看
思路是給每一個img標簽添加onclick事件，在事件中把img的src屬性封裝成一個特殊的url，然后進行攔截
如果是通過loadHTMLString去加載網頁的話，可以執行下面一句進行替換：
html = [html stringByReplacingOccurrencesOfString:@"<img " withString:@"<img onclick=/"window.location.href=('http://src.'+this.src);/" "];
如果是通過loadRequest，那就要再webViewDidFinishLoad中執行以下JS：
NSString *js = @"var imgs = document.getElementsByTagName(/"img/");" "for(var i=0;i<imgs.length;i++){" " var img = imgs[i];" " img.onclick=function(){window.location.href=('http://src.'+this.src);}" "}"; [webView stringByEvaluatingJavaScriptFromString:js];然后通過webview的代理方法去攔截，拿到圖片的url，之后就可以做各種處理了
- (BOOL)webView:(UIWebView *)webView shouldStartLoadWithRequest:(NSURLRequest *)request navigationType:(UIWebViewNavigationType)navigationType{ NSString *url = request.URL.absoluteString; if ([url hasPrefix:@"http://src."]) { url = [url stringByReplacingOccurrencesOfString:@"http://src." withString:@""]; // Do something.. return NO; } return YES;}3.為UIWebView添加一個跟隨網頁滾動的頁頭
UIWebView里包含一個scrollview，可以向scrollview里添加一個頁頭以達到跟隨網頁滾動的效果
CGFloat headerHeight = 36.0f;// 注意：y坐標必須是負數，IPHONE_WIDTH是屏幕寬度UIView *headerView = [[UIView alloc] initWithFrame:CGRectMake(0, -headerHeight, IPHONE_WIDTH, headerHeight)];[_webView.scrollView addSubview:_headerView];// 修改webView的scrollView的contentInset，讓頂部留出一點空間UIEdgeInsets edgeInset = _webView.scrollView.contentInset;_webView.scrollView.contentInset = UIEdgeInsetsMake(headerView.frameHeight, edgeInset.left, edgeInset.bottom, edgeInset.right);
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