WebVeiw 宽度自适应

来源：互联网发布：知乎女生打男朋友编辑：程序博客网时间：2024/06/07 02:47

NSString *urlStr = [NSString stringWithFormat:@"<html><head></head><body>%@</body></html>",detailModel.content];
    WebView.scrollView.bounces = NO;
    WebView.scalesPageToFit=NO;
    [WebView loadHTMLString:urlStr baseURL:[NSURL URLWithString:[NSString stringWithFormat:@"%@",HOST_URL]]];



    //html是否加载完成
    isLoadingFinished = NO;

    //第一次加载先隐藏webview
    [WebView setHidden:YES];


}
- (BOOL)webView:(UIWebView*)webView shouldStartLoadWithRequest:(NSURLRequest*)request navigationType:(UIWebViewNavigationType)navigationType {
     if(navigationType==UIWebViewNavigationTypeLinkClicked)//判断是否是点击链接
     {
         return NO;
     }
     else{return YES;}
}
- (void)webViewDidFinishLoad:(UIWebView *)webView{

    //若已经加载完成，则显示webView并return
    if(isLoadingFinished)
    {
        [WebView setHidden:NO];
        return;
    }

    //js获取body宽度
    NSString *bodyWidth= [webView stringByEvaluatingJavaScriptFromString: @"document.body.scrollWidth "];

    int widthOfBody = [bodyWidth intValue];

    //获取实际要显示的html
    NSString *html = [self htmlAdjustWithPageWidth:widthOfBody
                                              html:[NSString stringWithFormat:@"<html><head></head><body>%@</body></html>",detailModel.content]
                                           webView:webView];

    //设置为已经加载完成
    isLoadingFinished = YES;
    //加载实际要现实的html
    [WebView loadHTMLString:html baseURL:nil];


/
}
//获取宽度已经适配于webView的html。这里的原始html也可以通过js从webView里获取
- (NSString *)htmlAdjustWithPageWidth:(CGFloat )pageWidth
                                 html:(NSString *)html
                              webView:(UIWebView *)webView
{
    NSMutableString *str = [NSMutableString stringWithString:html];
    //计算要缩放的比例
    CGFloat initialScale = webView.frame.size.width/pageWidth;
    //将</head>替换为meta+head
    NSString *stringForReplace = [NSString stringWithFormat:@"<meta name=\"viewport\" content=\" initial-scale=%f, minimum-scale=0.1, maximum-scale=2.0, user-scalable=yes\"></head>",initialScale];

    NSRange range = NSMakeRange(0, str.length);
    //替换
    [str replaceOccurrencesOfString:@"</head>" withString:stringForReplace options:NSLiteralSearch range:range];
    return str;

}

感谢作者 http://borissun.iteye.com/blog/2023712

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