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代码来自于开源项目。是一个模仿网易新闻的客户端。

其拼接HTML的原理如下：

#pragma mark - ******************** 拼接html语言- (void)showInWebView{    NSMutableString *html = [NSMutableString string];    [html appendString:@""];    [html appendString:@""];    [html appendFormat:@"
   ",[[NSBundle mainBundle] URLForResource:@"SXDetails.css" withExtension:nil]];    [html appendString:@""];    [html appendString:@""];    [html appendString:[self touchBody]];    [html appendString:@""];    [html appendString:@""];    [self.webView loadHTMLString:html baseURL:nil];}//正文内容- (NSString *)touchBody{    NSMutableString *body = [NSMutableString string];    [body appendFormat:@"
   
    %@
   
",self.detailModel.title];//标题    [body appendFormat:@"
   
    %@
   
",self.detailModel.ptime];//时间    if (self.detailModel.body != nil) {        [body appendString:self.detailModel.body];    }    // 遍历img    for (SXDetailImgModel *detailImgModel in self.detailModel.img) {        NSMutableString *imgHtml = [NSMutableString string];    // 设置img的div    [imgHtml appendString:@"
   
    "];    // 数组存放被切割的像素 图片像素        NSArray *pixel = [detailImgModel.pixel componentsSeparatedByString:@"*"];        CGFloat width = [[pixel firstObject]floatValue];        CGFloat height = [[pixel lastObject]floatValue];    // 判断是否超过最大宽度        CGFloat maxWidth = [UIScreen mainScreen].bounds.size.width * 0.96;        if (width > maxWidth) {            height = maxWidth / width * height;            width = maxWidth;        }        NSString *onload = @"this.onclick = function() {"                            "  window.location.href = 'sx:src=' +this.src;"                                    "};";        [imgHtml appendFormat:@"
    ",onload,width,height,detailImgModel.src];    // 结束标记    [imgHtml appendString:@"
   
"];    // 替换标记        [body replaceOccurrencesOfString:detailImgModel.ref withString:imgHtml options:NSCaseInsensitiveSearch range:NSMakeRange(0, body.length)];    }    return body;}

在点击网页中的图片时，会提示保存：

#pragma mark - ******************** 将发出通知时调用- (BOOL)webView:(UIWebView *)webView shouldStartLoadWithRequest:(NSURLRequest *)request navigationType:(UIWebViewNavigationType)navigationType{    NSString *url = request.URL.absoluteString;    NSRange range = [url rangeOfString:@"sx:src="];    if (range.location != NSNotFound) {        NSInteger begin = range.location + range.length;        NSString *src = [url substringFromIndex:begin];        [self savePictureToAlbum:src];        return NO;    }    return YES;}#pragma mark - ******************** 保存到相册方法- (void)savePictureToAlbum:(NSString *)src{    UIAlertController *alert = [UIAlertController alertControllerWithTitle:@"提示" message:@"确定要保存到相册吗？" preferredStyle:UIAlertControllerStyleActionSheet];    [alert addAction:[UIAlertAction actionWithTitle:@"取消" style:UIAlertActionStyleCancel handler:nil]];    [alert addAction:[UIAlertAction actionWithTitle:@"确定" style:UIAlertActionStyleDestructive handler:^(UIAlertAction *action) {        NSURLCache *cache =[NSURLCache sharedURLCache];        NSURLRequest *request = [NSURLRequest requestWithURL:[NSURL URLWithString:src]];        NSData *imgData = [cache cachedResponseForRequest:request].data;        UIImage *image = [UIImage imageWithData:imgData];        UIImageWriteToSavedPhotosAlbum(image, nil, nil, nil);    }]];    [self presentViewController:alert animated:YES completion:nil];}

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