UIWebView计算高度

第一种：- (void)webViewDidFinishLoad:(UIWebView *)webView{    float height = [[webView stringByEvaluatingJavaScriptFromString:@"document.body.offsetHeight;"] floatValue];     //document.body.scrollHeight}第二种：- (void) webViewDidFinishLoad:(UIWebView *)webView{    CGRect frame = webView.frame;    CGSize fittingSize = [webView sizeThatFits:CGSizeZero];    frame.size = fittingSize;    webView.frame = frame;}另外一种- (void)viewDidLoad {    [super viewDidLoad];    webview.delegate = self;    [webview loadHTMLString:@"<div id='foo' style='background: red'>fdasfda</div>" baseURL:nil];}- (void)webViewDidFinishLoad:(UIWebView *)webView{NSString *output = [webview stringByEvaluatingJavaScriptFromString:@"document.getElementByIdx_x_x_x("foo").offsetHeight;"];    NSLog(@"height: %@", output);}