I managed to save a lot of time spent repositioning stuff and did this:
Add the parent view in Interface Builder on the same level as the would-be subviews.
Open the storyboard in a text editor and copy the would-be subviews inside the subviews tags of the parent view. XCode is going to update once you save it.
Not very elegant though, can't see why XCode doesn't support it with Shift or something.
I have done something similar to Stepan's solution, without using a storyboard. In the IB while the ViewController's view is open:
Create another view in addition to VC's main view
Move all subviews to the second view by dragging them from one view to another (dragging from the list on the left side resets their position) If you cannot select them from the IB using your mouse then select all from the list on the left side then select one final subview from the IB panel using "cmd" button.
Take them back to the final view on the initial main view.
The task is to regroup "child views" into "parent view" so they become children of parent view hierarchically and retain physical positions on display as before action.
First, adjust the parent view to physically covers area of child views. Second, make sure that all children are bellow it in the view list.
Now select all children with the mouse and move them e.g. one pixel up and one pixel down (just to say IB there is some change). After that release children and they will magically become children of the parent and keep their positions on display.
Select all controls you want to move from one UIView to another UiView(nay be child) or ScrollView
Cut/Copy
Now after dragging new UIView/ScrollView to your existing UIView, Don't click once to select it, instead DOUBLE click on the new UIView/ScrollView and paste all controls.
Distance difference will remain same among all controls, but you may have to reposition controls again. So don't click anywhere until you have repositioned those, just reposition all controls by navigation arrows as those are all selected already, or you may ve to select those again.
I detected another approach. It is basically: Move = Cut + Paste
This way you do:
get all your subviews to be children of the new parent view (P')
keep (almost) all of your constraints in Auto-Layout based Storyboard
keep your subview's relative positions (frames) one to another
This way you do not:
edit Storyboard file in a text editor
Base the thing is that each view except one (root) in Storyboard has its parent view. Next, when you copy/move multiple subviews, you lose frames and constraints.
The answer is pretty simple. You make a copy of your subviews (SVs) by copying their parent view (P) into new parent view (P'). This way you may need to recreate only constraints from that parent new view (P') to its new parent view but not for every subview you wanted to move.
After you did make copy of parent view (P) into new one (P'), from that new view (P') you:
remove all the children except ones that you wanted to move
recreate new parent (P') constraints
recreate possible Interface Builder outlets to (SVs')
And from original parent view (P) you:
remove all the children that you wanted to move
Before:
View1
View2
P
SVs-you-want-to-move
SVs-you-do-not-want-to-move
View3
After:
View1
View2
P
SVs-you-do-not-want-to-move
View3
P'
SVs'-you-want-to-move
I should stress that this does not generalise well if you have e.g. UIScrollView as a parent view. Then a copy of it would be again a UIScrollView what may not be desirable.
Another thing is when you do remove some of the subviews (SVs) in original parent view (P), you may need to recreate some constraints if other (non-moveable subviews) reference them. But you should do that anyway.
Xcode Interface Builder messes when a Parent View is dragged and dropped into another View (UIView, ScrollView, StackView)
Q:
Embedding a View (which contains many other subviews within it) into a ScrollView or in another top level view is not straight forward with what I have seen so far. What happens soon after is all the subviews might seems to be misplaced due to it couldn’t find their original frame.
A:
Follow following steps and you will be able to resolve it easier as possible:
Select the items you want in your subview, then
Go to menubar, Editor -> Embed In -> View
Copy this new View (Cmd+C) with the subviews (for me currently all the constraints were preserved so far at this point)
Go to the view (be it a ScrollView or may be StackView) you want the subviews to be in and paste (Cmd+V) the copied view
Select the pasted Embedding View (which you newly created previously) and Go to menubar of Xcode, Editor -> Unembed
No, not finished yet! Sometimes, you may experience that there are few more UI Constraint related issues, you will have to resolve them accordingly.
Create the desired parent view (scroll view or uiview) in the xib at the root level and resize it accordingly
Copy all the views that you want to be subviews of this parent view and paste them onto the new view you created in step 1
At this point you will have duplicated these views. The newly added views would be a misaligned but still in the same order and at the same distance with respect to each other, align them in the xib to match their bounds with the old copies of the same view (This assumes that the new parent view has same bounds as the old one)
The newly added views will lose some of the constraints, refer to the old views to fix those