获取WKWebView实际高度

#pragma mark - WKNavigationDelegate

-(void)webView:(WKWebView*)webView didFinishNavigation:(WKNavigation*)navigation{

//获取内容实际高度（像素）@"document.getElementById(\"content\").offsetHeight;"

[webViewevaluateJavaScript:@"document.body.scrollHeight"completionHandler:^(id_Nullable result,NSError*_Nullable error) {

CGFloat    webViewHeight = [result doubleValue];

NSLog(@"获取显示高度---%f",webViewHeight);

if (self.htmlLoadFinish && ! self.webView.isLoading) {

    [self.webViewmas_makeConstraints:^(MASConstraintMaker*make) {

        make.height.mas_equalTo(webViewHeight);

    }];

    NSLog(@"webViewHeight 实际整个高度---%@",NSStringFromCGSize(webView.scrollView.contentSize));

}

}];

}