hides placeholder

[YLKwan]

I'm using autolayout. The height of the calendar is 0 initially, user can expand the calendar by clicking a button. but if i hide placeholder. the height of bounds returned by boundingRectWillChange is 0 , i can't get the correct height to update the height constraint

[WenchaoD]

The recommended intial height should be 300, but it shouldn't be 0. U can set the hidden property to YES initially.