UitextView长文本不可见

Question

在UITableViewCell中为UITextView添加了一个长文本，文本不可见。

textView= new UITextView()
            {
                TranslatesAutoresizingMaskIntoConstraints = false,
                Font = UIFont.SystemFontOfSize(17f),
                UserInteractionEnabled = true,
                Editable = false,
                ScrollEnabled = false,
                DataDetectorTypes = UIDataDetectorType.Link,
                TextContainerInset = UIEdgeInsets.Zero,
                TextContainer = { LineFragmentPadding = 0 },
            };


textView.Text = text;//Very very long text