How do I auto size a UIScrollView to fit its content

Question

Is there a way to make a UIScrollView auto-adjust to the height  or width  of the content it s scrolling   Something like    scrollView setContentSize  CGSizeMake 320  content height

User · Answer

I added this to Espuz and JCC s answer  It uses the y position of the subviews and doesn t include the scroll bars  Edit Uses the bottom of the lowest sub view that is visible      CGFloat  bottomOfLowestContent  UIView   view       CGFloat lowestPoint   0 0       BOOL restoreHorizontal   NO      BOOL restoreVertical   NO       if   view respondsToSelector  selector setShowsHorizontalScrollIndicator     amp  amp   view respondsToSelector  selector setShowsVerticalScrollIndicator                   if    UIScrollView  view showsHorizontalScrollIndicator                         restoreHorizontal   YES                UIScrollView  view setShowsHorizontalScrollIndicator NO                     if    UIScrollView  view showsVerticalScrollIndicator                         restoreVertical   YES                UIScrollView  view setShowsVerticalScrollIndicator NO                       for  UIView  subView in view subviews                if   subView hidden                        CGFloat maxY   CGRectGetMaxY subView frame               if  maxY  gt  lowestPoint                                lowestPoint   maxY                                    if   view respondsToSelector  selector setShowsHorizontalScrollIndicator     amp  amp   view respondsToSelector  selector setShowsVerticalScrollIndicator                   if  restoreHorizontal                          UIScrollView  view setShowsHorizontalScrollIndicator YES                     if  restoreVertical                          UIScrollView  view setShowsVerticalScrollIndicator YES                        return lowestPoint

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The best method I ve ever come across to update the content size of a UIScrollView based on its contained subviews      Objective-C   CGRect contentRect   CGRectZero   for  UIView  view in self scrollView subviews        contentRect   CGRectUnion contentRect  view frame     self scrollView contentSize   contentRect size       Swift   let contentRect  CGRect   scrollView subviews reduce into   zero    rect  view in     rect   rect union view frame    scrollView contentSize   contentRect size

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Following extension would be helpful in Swift   extension UIScrollView      func setContentViewSize offset CGFloat   0 0               dont show scroll indicators         showsHorizontalScrollIndicator   false         showsVerticalScrollIndicator   false          var maxHeight   CGFloat   0         for view in subviews               if view isHidden                   continue                           let newHeight   view frame origin y   view frame height             if newHeight  gt  maxHeight                   maxHeight   newHeight                                    set content size         contentSize   CGSize width  contentSize width  height  maxHeight   offset             show scroll indicators         showsHorizontalScrollIndicator   true         showsVerticalScrollIndicator   true           Logic is the same with the given answers  However  It omits hidden views within UIScrollView and calculation is performed after scroll indicators set hidden    Also  there is an optional function parameter and you re able to add an offset value by passing parameter to function

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For swift4 using reduce   self scrollView contentSize   self scrollView subviews reduce CGRect zero       return  0 union  1 frame     size

User · Answer

You can get height of the content inside UIScrollView by calculate which child  reaches furthers   To calculate this you have to take in consideration origin Y  start  and item height    float maxHeight   0  for  UIView  child in scrollView subviews        float childHeight   child frame origin y   child frame size height        if child spans more than current maxHeight then make it a new maxHeight     if  childHeight  gt  maxHeight          maxHeight   childHeight      set content size  scrollView setContentSize  CGSizeMake 320  maxHeight       By doing things this way items  subviews  don t have to be stacked directly one under another

User · Answer

The size depends on the content loaded inside of it  and the clipping options  If its a textview  then it also depends on the wrapping  how many lines of text  the font size  and so on and on  Nearly impossible for you to compute yourself  The good news is  it is computed after the view is loaded and in the viewWillAppear  Before that  it s all unknown and and content size will be the same as frame size  But  in the viewWillAppear method and after  such as the viewDidAppear  the content size will be the actual

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why not single line of code     yourScrollView contentSize   CGSizeMake 0   lastView frame origin y    lastView frame size height

User · Answer

Here s a Swift 3 adaptation of  leviatan s answer    EXTENSION  import UIKit   extension UIScrollView        func resizeScrollViewContentSize              var contentRect   CGRect zero          for view in self subviews                contentRect   contentRect union view frame                      self contentSize   contentRect size             USAGE  scrollView resizeScrollViewContentSize     Very easy to use

User · Answer

UIScrollView doesn t know the height of its content automatically  You must calculate the height and width for yourself  Do it with something like  CGFloat scrollViewHeight   0 0f  for  UIView  view in scrollView subviews       scrollViewHeight    view frame size height      scrollView setContentSize  CGSizeMake 320  scrollViewHeight       But this only work if the views are one below the other  If you have a view next to each other you only have to add the height of one if you don t want to set the content of the scroller larger than it really is

User · Answer

I came up with another solution based on  emenegro s solution  NSInteger maxY   0  for  UIView  subview in scrollView subviews        if  CGRectGetMaxY subview frame   gt  maxY                maxY   CGRectGetMaxY subview frame           maxY    10   scrollView setContentSize CGSizeMake scrollView frame size width  maxY      Basically  we figure out which element is furthest down in the view and adds a 10px padding to the bottom

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Because a scrollView can have other scrollViews or different inDepth subViews tree  run in depth recursively is preferable     Swift 2  extension UIScrollView         it will block the mainThread     func recalculateVerticalContentSize synchronous              let unionCalculatedTotalRect   recursiveUnionInDepthFor self          self contentSize   CGRectMake 0  0  self frame width  unionCalculatedTotalRect height  size             private func recursiveUnionInDepthFor  view  UIView  - gt  CGRect           var totalRect   CGRectZero           calculate recursevly for every subView         for subView in view subviews               totalRect    CGRectUnion totalRect  recursiveUnionInDepthFor subView                       return the totalCalculated for all in depth subViews          return CGRectUnion totalRect  view frame            Usage   scrollView recalculateVerticalContentSize synchronous

User · Answer

Or just do    int y   CGRectGetMaxY   UIView    scrollView subviews lastObject   frame     scrollView setContentSize  CGSizeMake CGRectGetWidth  scrollView frame   y        This solution was added by me as a comment in this page  After getting 19 up-votes for this comment  I ve decided to add this solution as a formal answer for the benefit of the community

User · Answer

import UIKit  class DynamicSizeScrollView  UIScrollView        var maxHeight  CGFloat   UIScreen main bounds size height     var maxWidth  CGFloat   UIScreen main bounds size width      override func layoutSubviews             super layoutSubviews           if    CGSizeEqualToSize bounds size self intrinsicContentSize               self invalidateIntrinsicContentSize                        override var intrinsicContentSize  CGSize           let height   min contentSize height  maxHeight          let width   min contentSize height  maxWidth          return CGSize width  width  height  height

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Wrapping Richy s code I created a custom UIScrollView class that automates content resizing completely   SBScrollView h   interface SBScrollView   UIScrollView  end   SBScrollView m    implementation SBScrollView -  void  layoutSubviews       CGFloat scrollViewHeight   0 0f      self showsHorizontalScrollIndicator   NO      self showsVerticalScrollIndicator   NO      for  UIView  view in self subviews                if   view hidden                        CGFloat y   view frame origin y              CGFloat h   view frame size height              if  y   h  gt  scrollViewHeight                                scrollViewHeight   h   y                                    self showsHorizontalScrollIndicator   YES      self showsVerticalScrollIndicator   YES       self setContentSize  CGSizeMake self frame size width  scrollViewHeight        end   How to use  Simply import the  h file to your view controller and declare a SBScrollView instance instead of the normal UIScrollView one

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I also found leviathan s answer to work the best  However  it was calculating a strange height  When looping through the subviews  if the scrollview is set to show scroll indicators  those will be in the array of subviews  In this case  the solution is to temporarily disable the scroll indicators before looping  then re-establish their previous visibility setting   - void adjustContentSizeToFit is a public method on a custom subclass of UIScrollView   - void awakeFromNib           dispatch async dispatch get main queue                self adjustContentSizeToFit              - void adjustContentSizeToFit        BOOL showsVerticalScrollIndicator   self showsVerticalScrollIndicator      BOOL showsHorizontalScrollIndicator   self showsHorizontalScrollIndicator       self showsVerticalScrollIndicator   NO      self showsHorizontalScrollIndicator   NO       CGRect contentRect   CGRectZero      for  UIView  view in self subviews            contentRect   CGRectUnion contentRect  view frame             self contentSize   contentRect size       self showsVerticalScrollIndicator   showsVerticalScrollIndicator      self showsHorizontalScrollIndicator   showsHorizontalScrollIndicator

User · Answer

Set dynamic content size like this    self scroll view contentSize   CGSizeMake screen width CGRectGetMaxY self controlname frame  20

User · Answer

it depends on the content really   content frame height might give you what you want   Depends if content is a single thing  or a collection of things

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I think this can be a neat way of updating UIScrollView s content view size   extension UIScrollView       func updateContentViewSize             var newHeight  CGFloat   0         for view in subviews               let ref   view frame origin y   view frame height             if ref  gt  newHeight                   newHeight   ref                                 let oldSize   contentSize         let newSize   CGSize width  oldSize width  height  newHeight   20          contentSize   newSize

User · Answer

Great  amp  best solution from  leviathan  Just translating to swift using FP  functional programming  approach   self scrollView contentSize   self scrollView subviews reduce CGRect         CGRectUnion  0   1 frame     size

User · Answer

Solution if you re using auto layout    Set translatesAutoresizingMaskIntoConstraints to NO on all views involved  Position and size your scroll view with constraints external to the scroll view  Use constraints to lay out the subviews within the scroll view  being sure that the constraints tie to all four edges of the scroll view and do not rely on the scroll view to get their size    Source  https   developer apple com library ios technotes tn2154  index html

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Here is the accepted answer in swift for anyone who is too lazy to convert it     var contentRect   CGRectZero for view in self scrollView subviews       contentRect   CGRectUnion contentRect  view frame    self scrollView contentSize   contentRect size

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