View at the Bottom in a Uiscrollview, with Autolayout

View at the bottom in a UIScrollView, with AutoLayout

Fairly easy to do with Auto-Layout only... no code required.

The key is to use a "content view" to hold the elements, and a greater-than-or-equal constraint between your "bottom" element and your "footer" view.

In this image, yellow is the main view, green is the scroll view, blue is the content view, the labels are gray and the footer view is pink.

• Start with a fresh view controller
• add a scroll view, normal constraints (I used 20 all the way around, so we can see the frame)
• add a UIView to the scrollView - this will be our "content view"
• constrain contentView Top/Bottom/Leading/Trailing all equal to 0 to the scrollView
• constrain both the Width and Height of the contentView equal to the scrollView
• add your elements - here I used 3 labels
• constrain the labels as usual... I used:
  
  
  • LabelA - Top/Leading/Trailing all at 20, vertical spacing to LabelB of 60
  • LabelB - Leading/Trailing at 20, vertical spacing to LabelC of 60
  • LabelC - Leading/Trailing at 20
• LabelC is also set to Number of Lines: 0 so it will expand with multiple lines of text
• Add a UIView as a "footer view" (I stuck a label in it)
• constrain the footerView Leading/Trailing/Bottom all at 20 (so we can see the frame)
• either set a Height constraint on footerView, or use its content to constrain its height
• add a Vertical Spacing constraint from LabelC to footerView, and set it to >= 40
• last step, change the Height constraint of contentView to Priority: 250

Now, as you expand/contract the height of LabelC, the footerView will keep at least 40-pts of vertical space. When LabelC gets big enough to "push" footerView below the bottom, scrollView will become scrollable.

Results:

iOS Autolayout storyboard ScrollView - button bottom of the scrollview is unable to clickable

Just now found the answer with removing any autolayout constraints, for content view we have to set constraints like below:

• Top, bottom, left, right
• Align CenterX - here we have to set the content view height then for that constraint we have to set constant as scrollview content size height

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