Can't change size of view in Storyboard

Question

I am using Xcode 7.3, I can change the size of any kind of view from the property and I can drag the views around. Unfortunately, view seems to be locked while trying to edit the size of view using mouse. As you can see in the image, when I click ImageView its not giving option to resize the view.

Answer 1

You can go to Editor > Canvas > Show Resize Knobs to make changes.

Answer 2

Select your viewcontroller and then click Show document outline in the left bottom corner. It will show all the views in that view controller. Then single click the item i.e, Imageview in this case. Then the 6squares will appear.