OC 调用JS 代码 处理HTML5 实战

直接贴代码了；已经懒到极致了！

 

需求：     解决服务器传过来的js代码，并正确的按想要的排版方式显示在页面上(即适配移动端各个屏幕)

解决方案：  加载前提前拦截修改适配样式 (当然也可以前端做适配各个平台， 不过移动端做了处理就不用理会前端是否适配的问题)

 

处理的问题有：  适配文字大小； 适配图片大小； 适配视频大小；

 

- (void)parseHTMLWithHtml:(NSString *)htmls {

    self.content.alpha = 0;

    self.webView = [[UIWebView alloc] initWithFrame:CGRectMake(15, CGRectGetMaxY(_imagesView.frame) , kWIDTH_SCREEN -30, kHEIGHT_SCREEN/2 )];

    [self.scroll addSubview:self.webView];

    self.webView.scrollView.scrollEnabled = NO;

    self.webView.delegate = self;

    self.webView.backgroundColor = [UIColor whiteColor];

    self.scroll.contentSize = CGSizeMake(kWIDTH_SCREEN -30 , CGRectGetMaxY(self.webView.frame)+64+20);

    [SVProgressHUD showWithStatus:@"努力加载..."];

    htmls = [htmls stringByReplacingOccurrencesOfString:@"<br/>" withString:@""];

    [self.webView loadHTMLString:htmls baseURL:nil];

    [self.webView addObserver:self forKeyPath:@"loading" options:NSKeyValueObservingOptionNew context:nil];

}

 

- (void)webViewDidFinishLoad:(UIWebView *)webView {

    [webView stringByEvaluatingJavaScriptFromString:@"document.getElementsByTagName('body')[0].style.webkitTextSizeAdjust= '75%'"];

    NSString *js=@"var script = document.createElement('script');"

    "script.type = 'text/javascript';"

    "script.text = \"function ResizeImages() { "

    "var myimg,oldwidth;"

    "var maxwidth = %f;"

    "for(i=0;i <document.images.length;i++){"

    "myimg = document.images[i];"

    "if(myimg.width > maxwidth){"

    "oldwidth = myimg.width;"

    "myimg.width = %f;"

    "}"

    "}"

    "}\";"

    "document.getElementsByTagName('head')[0].appendChild(script);";

    js=[NSString stringWithFormat:js,[UIScreen mainScreen].bounds.size.width-30 ,[UIScreen mainScreen].bounds.size.width-45];

    [webView stringByEvaluatingJavaScriptFromString:js];

    [webView stringByEvaluatingJavaScriptFromString:@"ResizeImages();"];

    NSString *js2 =@"var script = document.createElement('script');"

    "script.type = 'text/javascript';"

    "script.text = \"function ResizeVideo() { "

    "var number = (document.getElementsByTagName('iframe')[0].height / document.getElementsByTagName('iframe')[0].width);"

    "document.getElementsByTagName('iframe')[0].width= %f;"

    "document.getElementsByTagName('iframe')[0].height= document.getElementsByTagName('iframe')[0].width * number ;"

    "}\";"

    "document.getElementsByTagName('head')[0].appendChild(script);";

    js2 = [NSString stringWithFormat:js2,[UIScreen mainScreen].bounds.size.width-30 ];

    [webView stringByEvaluatingJavaScriptFromString:js2];

    [webView stringByEvaluatingJavaScriptFromString:@"ResizeVideo();"];

    CGFloat webViewHeight=[webView.scrollView contentSize].height;

    CGRect newFrame = webView.frame;

    newFrame.size.height = webViewHeight;

    webView.frame = newFrame;

    self.scroll.contentSize = CGSizeMake(kWIDTH_SCREEN - 30, CGRectGetMaxY(webView.frame) - kHEIGHT_SCREEN/3);

    dispatch_after(dispatch_time(DISPATCH_TIME_NOW, (int64_t)(1.8 * NSEC_PER_SEC)), dispatch_get_main_queue(), ^{

           [SVProgressHUD dismiss];

    });

 

}