Call layoutsubview after setFont of TextView

Call layoutsubview after setFont of TextView.
Otherwise, if set text in code:
descriptionField.text = @"Descriptio中文n";
It will show like:
![2013-12-13 11 48 43](https://f.cloud.github.com/assets/62998/1739772/c97e824c-63aa-11e3-98cf-50fd7d0ae0c5.png)