title: UIPickerView Height not changeable
body: <p>I'm trying to change PickerView's height</p>
  
  <pre><code>self.pickerView = [[UIPickerView alloc] init];
  self.pickerView.frame = CGRectMake(0, 0, frame.size.width, frame.size.height);
  </code></pre>
  
  <p>Xcode log shows the following message:</p>
  
  <pre><code>-[UIPickerView setFrame:]: invalid height value 274.0 pinned to 216.0 
  </code></pre>
  
  <p>How can I change its height?</p>