Picker视图约束iphone4 / iphone5

Question

I have a picker view on ios7. This picker view as at the bottom of the view controller. On the iPhone 5 it displays fine, and its big enough to see the options in the picker view.

On the iPhone 4 it is too small to see the options in the picker view.

I know I have to use constraints, but any idea which way to go with this one.

The picker view is stuck to the bottom of the vc.

thanks

Answer 1

In storyboard, simply ctrl-click-drag to the view you want to make the constraint with like this:

and then you can see all your constraints on the right side of Xcode:

Answer 2

In simple way.

Click on the picker and click on the " Add missing Constraints "