UIWebView的加载方式及获得动态高度的方法

UIWebView加载数据3种方法

1.- (void)loadRequest:(NSURLRequest *)request;

    NSURL *url = [NSURL URLWithString:urlString];    NSURLRequest *request = [NSURLRequest requestWithURL:url];    [self.webView loadRequest:request];

        直接加载url地址。

2.- (void)loadHTMLString:(NSString *)string baseURL:(NSURL *)baseURL;

        如果获取到的是HTML字符串，可以用这个方法加载。

3.- (void)loadData:(NSData *)data MIMEType:(NSString *)MIMEType textEncodingName:(NSString *)textEncodingName baseURL:(NSURL *)baseURL

    NSURL *url = [NSURL URLWithString:urlString];    NSData *data=[NSData dataWithContentsOfURL:url];    [self.webView loadData:data MIMEType:@"text/html" textEncodingName:@"GBK" baseURL:nil];

       编码格式有GB2312、GBK、UTF-8等许多种，当url地址的编码格式比较特殊时，可以用这个方法加载。

UIWebView获得动态高度的方法

首先，需要生成持有一个一个webView

    _webView=[[UIWebView alloc]initWithFrame:CGRectMake(0, 64, SCREEN_WIDTH, SCREEN_HEIGHT-64-49)];    _webView.delegate=self;    _webView.scalesPageToFit = YES;    [self.view addSubview:_webView];    NSURLRequest *request=[NSURLRequest requestWithURL:[NSURL URLWithString:urlString]];    [_webView loadRequest:request];

实现它的代理方法，在- (void)webViewDidFinishLoad:(UIWebView *)webView里

#pragma UIWebViewDelegate- (BOOL)webView:(UIWebView *)webView shouldStartLoadWithRequest:(NSURLRequest *)request navigationType:(UIWebViewNavigationType)navigationType{    return YES;}- (void)webViewDidStartLoad:(UIWebView *)webView{    NSLog(@"开始加载");}- (void)webViewDidFinishLoad:(UIWebView *)webView{    CGFloat webViewHeight = [[webView stringByEvaluatingJavaScriptFromString:@"document.body.offsetHeight"]floatValue];        //获取内容实际高度（像素）        NSLog(@"%f",webViewHeight);    NSLog(@"结束加载");  }- (void)webView:(UIWebView *)webView didFailLoadWithError:(NSError *)error{    NSLog(@"加载失败");}

这里document.body.offsetHeight 可以用document.body.clientHeight和document.body.scrollHeight替换

还有一种方法

<span style="color:#3d464d;">- (void)webViewDidFinishLoad:(UIWebView *)webView{</span><div class="line number31 index30 alt2" style="list-style: none; line-height: 15.4px; font-family: Consolas, 'Bitstream Vera Sans Mono', 'Courier New', Courier, monospace; font-size: 14px; font-variant-ligatures: normal; font-variant-position: normal; font-variant-numeric: normal; font-variant-alternates: normal; font-variant-east-asian: normal; widows: 1; border: 0px !important; padding: 0px 1em !important; margin: 0px !important; border-top-left-radius: 0px !important; border-top-right-radius: 0px !important; border-bottom-right-radius: 0px !important; border-bottom-left-radius: 0px !important; bottom: auto !important; float: none !important; height: auto !important; left: auto !important; outline: 0px !important; overflow: visible !important; position: static !important; right: auto !important; top: auto !important; vertical-align: baseline !important; width: auto !important; box-sizing: content-box !important; white-space: pre !important; background-image: none !important;"><code class="java preprocessor" style="border-top-left-radius: 0px !important; border-top-right-radius: 0px !important; border-bottom-right-radius: 0px !important; border-bottom-left-radius: 0px !important; border: 0px !important; bottom: auto !important; float: none !important; height: auto !important; left: auto !important; line-height: 1.1em !important; margin: 0px !important; outline: 0px !important; overflow: visible !important; padding: 0px !important; position: static !important; right: auto !important; top: auto !important; vertical-align: baseline !important; width: auto !important; box-sizing: content-box !important; font-family: Consolas, 'Bitstream Vera Sans Mono', 'Courier New', Courier, monospace !important; font-size: 1em !important; background-image: none !important;"><span style="color: gray !important; white-space: pre;"></span><span style="color:#333333;">CGRect frame = webView.frame;</span></code></div><div class="line number32 index31 alt1" style="list-style: none; line-height: 15.4px; font-family: Consolas, 'Bitstream Vera Sans Mono', 'Courier New', Courier, monospace; font-size: 14px; font-variant-ligatures: normal; font-variant-position: normal; font-variant-numeric: normal; font-variant-alternates: normal; font-variant-east-asian: normal; widows: 1; border: 0px !important; padding: 0px 1em !important; margin: 0px !important; border-top-left-radius: 0px !important; border-top-right-radius: 0px !important; border-bottom-right-radius: 0px !important; border-bottom-left-radius: 0px !important; bottom: auto !important; float: none !important; height: auto !important; left: auto !important; outline: 0px !important; overflow: visible !important; position: static !important; right: auto !important; top: auto !important; vertical-align: baseline !important; width: auto !important; box-sizing: content-box !important; white-space: pre !important; background-image: none !important;"><span style="color:#333333;"><code class="java spaces" style="border-top-left-radius: 0px !important; 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border: 0px !important; bottom: auto !important; float: none !important; height: auto !important; left: auto !important; line-height: 1.1em !important; margin: 0px !important; outline: 0px !important; overflow: visible !important; padding: 0px !important; position: static !important; right: auto !important; top: auto !important; vertical-align: baseline !important; width: auto !important; box-sizing: content-box !important; font-family: Consolas, 'Bitstream Vera Sans Mono', 'Courier New', Courier, monospace !important; font-size: 1em !important; background-image: none !important;">CGSize fittingSize = [webView sizeThatFits:CGSizeZero];</code></span></div><div class="line number33 index32 alt2" style="list-style: none; line-height: 15.4px; font-family: Consolas, 'Bitstream Vera Sans Mono', 'Courier New', Courier, monospace; font-size: 14px; font-variant-ligatures: normal; font-variant-position: normal; font-variant-numeric: normal; font-variant-alternates: normal; font-variant-east-asian: normal; widows: 1; border: 0px !important; padding: 0px 1em !important; margin: 0px !important; border-top-left-radius: 0px !important; border-top-right-radius: 0px !important; border-bottom-right-radius: 0px !important; border-bottom-left-radius: 0px !important; bottom: auto !important; float: none !important; height: auto !important; left: auto !important; outline: 0px !important; overflow: visible !important; position: static !important; right: auto !important; top: auto !important; vertical-align: baseline !important; width: auto !important; box-sizing: content-box !important; white-space: pre !important; background-image: none !important;"><span style="color:#333333;"><code class="java spaces" style="border-top-left-radius: 0px !important; border-top-right-radius: 0px !important; border-bottom-right-radius: 0px !important; border-bottom-left-radius: 0px !important; border: 0px !important; bottom: auto !important; float: none !important; height: auto !important; left: auto !important; line-height: 1.1em !important; margin: 0px !important; outline: 0px !important; overflow: visible !important; padding: 0px !important; position: static !important; right: auto !important; top: auto !important; vertical-align: baseline !important; width: auto !important; box-sizing: content-box !important; font-family: Consolas, 'Bitstream Vera Sans Mono', 'Courier New', Courier, monospace !important; font-size: 1em !important; background-image: none !important; background-position: initial initial !important; background-repeat: initial initial !important;">        </code><code class="java preprocessor" style="border-top-left-radius: 0px !important; border-top-right-radius: 0px !important; border-bottom-right-radius: 0px !important; border-bottom-left-radius: 0px !important; border: 0px !important; bottom: auto !important; float: none !important; height: auto !important; left: auto !important; line-height: 1.1em !important; margin: 0px !important; outline: 0px !important; overflow: visible !important; padding: 0px !important; position: static !important; right: auto !important; top: auto !important; vertical-align: baseline !important; width: auto !important; box-sizing: content-box !important; font-family: Consolas, 'Bitstream Vera Sans Mono', 'Courier New', Courier, monospace !important; font-size: 1em !important; background-image: none !important;">frame.size = fittingSize;</code></span></div><div class="line number34 index33 alt1" style="list-style: none; line-height: 15.4px; font-family: Consolas, 'Bitstream Vera Sans Mono', 'Courier New', Courier, monospace; font-size: 14px; font-variant-ligatures: normal; font-variant-position: normal; font-variant-numeric: normal; font-variant-alternates: normal; font-variant-east-asian: normal; widows: 1; border: 0px !important; padding: 0px 1em !important; margin: 0px !important; border-top-left-radius: 0px !important; border-top-right-radius: 0px !important; border-bottom-right-radius: 0px !important; border-bottom-left-radius: 0px !important; bottom: auto !important; float: none !important; height: auto !important; left: auto !important; outline: 0px !important; overflow: visible !important; position: static !important; right: auto !important; top: auto !important; vertical-align: baseline !important; width: auto !important; box-sizing: content-box !important; white-space: pre !important; background-image: none !important;"><span style="color:#333333;"><code class="java spaces" style="border-top-left-radius: 0px !important; border-top-right-radius: 0px !important; border-bottom-right-radius: 0px !important; border-bottom-left-radius: 0px !important; border: 0px !important; bottom: auto !important; float: none !important; height: auto !important; left: auto !important; line-height: 1.1em !important; margin: 0px !important; outline: 0px !important; overflow: visible !important; padding: 0px !important; position: static !important; right: auto !important; top: auto !important; vertical-align: baseline !important; width: auto !important; box-sizing: content-box !important; font-family: Consolas, 'Bitstream Vera Sans Mono', 'Courier New', Courier, monospace !important; font-size: 1em !important; background-image: none !important;">        </code><code class="java preprocessor" style="border-top-left-radius: 0px !important; border-top-right-radius: 0px !important; border-bottom-right-radius: 0px !important; border-bottom-left-radius: 0px !important; border: 0px !important; bottom: auto !important; float: none !important; height: auto !important; left: auto !important; line-height: 1.1em !important; margin: 0px !important; outline: 0px !important; overflow: visible !important; padding: 0px !important; position: static !important; right: auto !important; top: auto !important; vertical-align: baseline !important; width: auto !important; box-sizing: content-box !important; font-family: Consolas, 'Bitstream Vera Sans Mono', 'Courier New', Courier, monospace !important; font-size: 1em !important; background-image: none !important;">webView.frame = frame;</code></span></div><span style="color:#3d464d;">}</span>