title: How to use the new auto sizing feature of UITableViewCell in iOS 8?
body: <p>I have a custom UITableViewCell subclass, and say there is a UIPickerView inside of it. As far as I know the cell requires constraints on both its top and its bottom so that the height can be calculated. The problem is when I specify only the top and bottom constraints, the height of the cell displayed is like 44. So I added a height constraint for the UIPickerView to be 162, then the console says all these constraints cannot be satisfied simultaneously.</p>
  
  <p>So how can I let the estimated height to be 162 so that the UIPickerView is displayed properly (Without overriding the height function of UITableViewDelegate?)</p>