禁用放大縮小手勢

UIScrollView *scrollView = [webView.subviews objectAtIndex:0];scrollView.delegate = self;//self must be UIScrollViewDelegate
- (UIView *)viewForZoomingInScrollView:(UIScrollView *)scrollView 
{ 
    return nil;
}

UPDATE: For iOS 5 or higher get scrollView like this:
webview.scrollView.delegate = self;

計算webView 大小

- (void)webViewDidFinishLoad:(UIWebView *)webView
{
    
    NSString *result = [webView stringByEvaluatingJavaScriptFromString:@"document.body.offsetHeight;"];
    
    NSInteger height = [result integerValue] + contentLabelTopMargin;
    [webView mas_makeConstraints:^(MASConstraintMaker *make) {
        make.height.mas_equalTo(height);
    }];
    [self.view setNeedsLayout];
}