UIWebView&WKWebView获取网页高度

实测，必需要延迟一会儿才能获取正确高度。

 -(void)webViewDidFinishLoad:(UIWebView *)webView {
    
    
    dispatch_after(dispatch_time(DISPATCH_TIME_NOW, (int64_t)(0.5 * NSEC_PER_SEC)), dispatch_get_main_queue(), ^{
        
        CGFloat height = 0.0;
        [webView sizeToFit];
        height = webView.scrollView.contentSize.height;
        CGRect webFrame = webView.frame;
        webFrame.size.height = height;
        webView.frame = webFrame;
        NSLog(@"网页的高度为=>%.f ", height);
    });

｝