UIScrollView scroll to bottom programmatically

Question

How can I make a UIScrollView scroll to the bottom within my code  Or in a more generic way  to any point of a subview

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Swift version of the accepted answer for easy copy pasting  let bottomOffset   CGPoint x  0  y  scrollView contentSize height - scrollView bounds size height  scrollView setContentOffset bottomOffset  animated  true

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Xamarin iOS version of accepted answer   var bottomOffset   new CGPoint  0       scrollView ContentSize Height - scrollView Frame Size Height        scrollView ContentInset Bottom    scrollView SetContentOffset  bottomOffset  false

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Solution to scroll to last item of a table View     Swift 3    if self items count  gt  0           self tableView scrollToRow at   IndexPath init row  self items count - 1  section  0   at  UITableViewScrollPosition bottom  animated  true

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A Swift 2 2 solution  taking contentInset into account  let bottomOffset   CGPoint x  0  y  scrollView contentSize height - scrollView bounds size height   scrollView contentInset bottom  scrollView setContentOffset bottomOffset  animated  true    This should be in an extension  extension UIScrollView      func scrollToBottom         let bottomOffset   CGPoint x  0  y  contentSize height - bounds size height   contentInset bottom      setContentOffset bottomOffset  animated  true          Note that you may want to check if bottomOffset y  gt  0 before scroll

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Extend UIScrollView to add a scrollToBottom method   extension UIScrollView       func scrollToBottom animated Bool            let offset   self contentSize height - self visibleSize height         if offset  gt  self contentOffset y               self setContentOffset CGPoint x  0  y  offset   animated  animated

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In swift      if self mainScroll contentSize height  gt  self mainScroll bounds size height           let bottomOffset   CGPointMake 0  self mainScroll contentSize height - self mainScroll bounds size height           self mainScroll setContentOffset bottomOffset  animated  true

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Scroll To Top  - CGPoint topOffset   CGPointMake 0  0   -  scrollView setContentOffset topOffset animated YES     Scroll To Bottom  - CGPoint bottomOffset   CGPointMake 0  scrollView contentSize height - self scrollView bounds size height    -  scrollView setContentOffset bottomOffset animated YES

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With an  optional  footerView and contentInset  the solution is   CGPoint bottomOffset   CGPointMake 0   tableView contentSize height - tableView frame size height    tableView contentInset bottom   if  bottomOffset y  gt  0    tableView setContentOffset  bottomOffset animated  YES

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Just an enhancement to the existing answer   CGPoint bottomOffset   CGPointMake 0  self scrollView contentSize height - self scrollView bounds size height   self scrollView contentInset bottom    self scrollView setContentOffset bottomOffset animated YES     It takes care of the bottom inset as well  in case you re using that to adjust your scroll view when the keyboard is visible

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A good way to ensure the bottom of your content is visible is to use the formula   contentOffsetY   MIN 0  contentHeight - boundsHeight    This ensures the bottom edge of your content is always at or above the bottom edge of the view  The MIN 0       is required because UITableView  and probably UIScrollView  ensures contentOffsetY  gt   0 when the user tries to scroll by visibly snapping contentOffsetY   0  This looks pretty weird to the user   The code to implement this is   UIScrollView scrollView        CGSize contentSize   scrollView contentSize  CGSize boundsSize   scrollView bounds size  if  contentSize height  gt  boundsSize height        CGPoint contentOffset   scrollView contentOffset      contentOffset y   contentSize height - boundsSize height       scrollView setContentOffset contentOffset animated YES

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Category to the rescue   Add this to a shared utility header somewhere    interface UIScrollView  ScrollToBottom  -  void scrollToBottomAnimated  BOOL animated   end   And then to that utility implementation    implementation UIScrollView ScrollToBottom  -  void scrollToBottomAnimated  BOOL animated        CGPoint bottomOffset   CGPointMake 0  self contentSize height - self bounds size height         self setContentOffset bottomOffset animated animated      end   Then Implement it wherever you like  for instance     myWebView scrollView  scrollToBottomAnimated YES

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While Matt solution seems correct to me you need to take in account also the collection view inset if there is one that has been set-up   The adapted code will be   CGSize csz   sv contentSize  CGSize bsz   sv bounds size  NSInteger bottomInset   sv contentInset bottom  if  sv contentOffset y   bsz height   bottomInset  gt  csz height         sv setContentOffset CGPointMake sv contentOffset x                                        csz height - bsz height   bottomInset                   animated YES

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CGFloat yOffset   scrollView contentOffset y   CGFloat height   scrollView frame size height   CGFloat contentHeight   scrollView contentSize height   CGFloat distance    contentHeight  - height  - yOffset   if distance  lt  0        return      CGPoint offset   scrollView contentOffset   offset y    distance    scrollView setContentOffset offset animated YES

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If you somehow change scrollView contentSize  ex  add something to stackView which is inside scrollView  you must call scrollView layoutIfNeeded   before scrolling  otherwise it does nothing   Example   scrollView layoutIfNeeded   let bottomOffset   CGPoint x  0  y  scrollView contentSize height - scrollView bounds size height   scrollView contentInset bottom  if bottomOffset y  gt  0        scrollView setContentOffset bottomOffset  animated  true

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It looks like all of the answers here didn t take the safe area into consideration  Since iOS 11  iPhone X had a safe area introduced  This may affect the scrollView s contentInset   For iOS 11 and above  to properly scroll to the bottom with the content inset included  You should use adjustedContentInset instead of contentInset  Check this code    Swift    let bottomOffset   CGPoint x  0  y  scrollView contentSize height - scrollView bounds height   scrollView adjustedContentInset bottom  scrollView setContentOffset bottomOffset  animated  true     Objective-C   CGPoint bottomOffset   CGPointMake 0  self scrollView contentSize height - self scrollView bounds size height   self scrollView adjustedContentInset bottom    self scrollView setContentOffset bottomOffset animated YES      Swift extension  this keeps the original contentOffset x     extension UIScrollView       func scrollsToBottom animated  Bool            let bottomOffset   CGPoint x  contentOffset x                                     y  contentSize height - bounds height   adjustedContentInset bottom          setContentOffset bottomOffset  animated  animated            References    adjustedContentInset

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Didn t work for me  when I tried to use it in UITableViewController on self tableView  iOS 4 1   after adding footerView  It scrolls out of the borders  showing black screen   Alternative solution    CGFloat height   self tableView contentSize height      self tableView setTableFooterView  myFooterView     self tableView reloadData     CGFloat delta   self tableView contentSize height - height   CGPoint offset    self tableView contentOffset    offset y    delta     self tableView setContentOffset  offset animated  YES

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Setting the content offset to the height of the content size is wrong  it scrolls the bottom of the content to the top of the scroll view  and thus out of sight   The correct solution is to scroll the bottom of the content to the bottom of the scroll view  like this  sv is the UIScrollView    CGSize csz   sv contentSize  CGSize bsz   sv bounds size  if  sv contentOffset y   bsz height  gt  csz height         sv setContentOffset CGPointMake sv contentOffset x                                        csz height - bsz height                   animated YES

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Using UIScrollView s setContentOffset animated  function to scroll to the bottom in Swift   let bottomOffset   CGPoint   CGPointMake 0  scrollView contentSize height - scrollView bounds size height   scrollView contentInset bottom  scrollView setContentOffset bottomOffset  animated  true

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A swifty implementation    extension UIScrollView      func scrollToBottom animated  Bool         if self contentSize height  lt  self bounds size height   return        let bottomOffset   CGPoint x  0  y  self contentSize height - self bounds size height       self setContentOffset bottomOffset  animated  animated          use it   yourScrollview scrollToBottom animated  true

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I found that contentSize doesn t really reflect the actual size of the text  so when trying to scroll to the bottom  it will be a little bit off  The best way to determine the actual content size is actually to use the NSLayoutManager s usedRectForTextContainer  method   UITextView  textView  CGSize textSize    textView layoutManager usedRectForTextContainer textView textContainer  size    To determine how much text actually is shown in the UITextView  you can calculate it by subtracting the text container insets from the frame height   UITextView  textView  UIEdgeInsets textInsets   textView textContainerInset  CGFloat textViewHeight   textView frame size height - textInsets top - textInsets bottom    Then it becomes easy to scroll      if you want scroll animation  use contentOffset UITextView  textView  textView contentOffset   CGPointMake textView contentOffset x  textSize - textViewHeight       if you don t want scroll animation CGRect scrollBounds   textView bounds  scrollBounds origin   CGPointMake textView contentOffset x  textSize - textViewHeight   textView bounds   scrollBounds    Some numbers for reference on what the different sizes represent for an empty UITextView   textView frame size    width 246  height 50  textSize    width 10  height 16 701999999999998  textView contentSize    width 246  height 33  textView textContainerInset    top 8  left 0  bottom 8  right 0

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For Horizontal ScrollView  If you like me has a Horizontal ScrollView and want to scroll to end of it  in my case to most right of it   you need to change some parts of the accepted answer   Objective-C  CGPoint rightOffset   CGPointMake self scrollView contentSize width - self scrollView bounds size width   self scrollView contentInset right  0     self scrollView setContentOffset rightOffset animated YES     Swift  let rightOffset  CGPoint   CGPoint x  self scrollView contentSize width - self scrollView bounds size width   self scrollView contentInset right  y  0  self scrollView setContentOffset rightOffset  animated  true

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Xamarin iOS version for UICollectionView of the accepted answer for ease in copying and pasting  var bottomOffset   new CGPoint  0  CollectionView ContentSize Height - CollectionView Frame Size Height   CollectionView ContentInset Bottom             CollectionView SetContentOffset  bottomOffset  false

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If you don t need animation  this works    self scrollView setContentOffset CGPointMake 0  CGFLOAT MAX  animated NO

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Simplest Solution    scrollview scrollRectToVisible CGRectMake scrollview contentSize width - 1 scrollview contentSize height - 1  1  1  animated YES

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I also found another useful way of doing this in the case you are using a UITableview  which is a subclass of UIScrollView      UITableView   self view scrollToRowAtIndexPath scrollIndexPath atScrollPosition UITableViewScrollPositionBottom animated YES

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Swift   You could use an extension like this   extension UIScrollView       func scrollsToBottom animated  Bool            let bottomOffset   CGPoint x  0  y  contentSize height - bounds size height          setContentOffset bottomOffset  animated  animated            Use   scrollView scrollsToBottom animated  true

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What if contentSize is lower than bounds    For Swift it is     scrollView setContentOffset CGPointMake 0  max scrollView contentSize height - scrollView bounds size height  0     animated  true

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valdyr  hope this will help you   CGPoint bottomOffset   CGPointMake 0   textView contentSize  height - textView frame size height    if  bottomOffset y  gt  0    textView setContentOffset  bottomOffset animated  YES

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You can use the UIScrollView s setContentOffset animated  function to scroll to any part of the content view  Here s some code that would scroll to the bottom  assuming your scrollView is self scrollView  Objective-C  CGPoint bottomOffset   CGPointMake 0  self scrollView contentSize height - self scrollView bounds size height   self scrollView contentInset bottom    self scrollView setContentOffset bottomOffset animated YES    Swift  let bottomOffset   CGPoint x  0  y  scrollView contentSize height - scrollView bounds height   scrollView contentInset bottom  scrollView setContentOffset bottomOffset  animated  true   Hope that helps

[ios] UIScrollView scroll to bottom programmatically

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