UITableView - scroll to the top

Question

In my table view I have to scroll to the top  But I cannot guarantee that the first object is going to be section 0  row 0  May be that my table view will start from section number 5   So I get an exception  when I call    mainTableView scrollToRowAtIndexPath  NSIndexPath indexPathForRow 0 inSection 0  atScrollPosition UITableViewScrollPositionTop animated NO     Is there another way to scroll to the top of table view

User · Answer

in swift    your row   selectioncellRowNumber your section if you have   selectionNumber if you dont have set is to zero    UITableViewScrollPosition Middle or Bottom or Top  var lastIndex   NSIndexPath forRow   selectioncellRowNumber  inSection  selectionNumber  self tableView scrollToRowAtIndexPath lastIndex  atScrollPosition  UITableViewScrollPosition Middle  animated  true

User · Answer

Swift     if you don t have tableView header    tableView setContentOffset CGPointMake 0   UIApplication sharedApplication   statusBarFrame height    animated  true    if so    tableView setContentOffset CGPointMake 0  -tableViewheader frame height     UIApplication sharedApplication   statusBarFrame height    animated  true

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Since my tableView is full of all kinds of insets  this was the only thing that worked well   Swift 3  if tableView numberOfSections  gt  0  amp  amp  tableView numberOfRows inSection  0   gt  0     tableView scrollToRow at  IndexPath row  0  section  0   at   top  animated  true      Swift 2  if tableView numberOfSections  gt  0  amp  amp  tableView numberOfRowsInSection 0   gt  0     tableView scrollToRowAtIndexPath NSIndexPath forRow  0  inSection  0   atScrollPosition   Top  animated  true

User · Answer

Swift 4   This works very well     self tableView reloadData   if you want to use this line remember to put it before  let indexPath   IndexPath row  0  section  0  self tableView scrollToRow at  indexPath  at   top  animated  true

User · Answer

using contentOffset is not the right way  this would be better as it is table view s natural way  tableView scrollToRow at  NSIndexPath init row  0  section  0  as IndexPath  at   top  animated  true

User · Answer

This was the only code snippet that worked for me  Swift 4       tableView scrollRectToVisible CGRect x  0  y  0  width  1  height  1   animated  true      tableView scrollToRow at  IndexPath row  0  section  0   at   top  animated  true      tableView setContentOffset CGPoint x  0  y  -70   animated  true    P S  70 is the height of my header and table view cell

User · Answer

DONT USE   tableView setContentOffset  zero  animated  true    It can sometimes set the offset improperly   For example  in my case  the cell was actually slightly above the view with safe area insets   Not good    INSTEAD USE   tableView scrollToRow at  IndexPath row  0  section  0   at   top  animated  true

User · Answer

If you need use Objective-C or you still in love  NSIndexPath  indexPath    NSIndexPath indexPathForRow 0 inSection 0         tableView scrollToRowAtIndexPath indexPath atScrollPosition UITableViewScrollPositionTop animated YES

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I had to add the multiply by -1   to the sum of the status bar and the navigation bar  because it was going that height off the screen   self tableView setContentOffset CGPointMake 0   -1       self navigationController  navigationBar height       UIApplication sharedApplication   statusBarFrame height     animated true

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Swift 3  tableView setContentOffset CGPoint zero  animated  true    if tableView setContentOffset don t work   Use    tableView beginUpdates   tableView setContentOffset CGPoint zero  animated  true  tableView endUpdates

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I use tabBarController and i have a few section in my tableview at every tab  so this is best solution for me   extension UITableView        func scrollToTop             for index in 0   numberOfSections - 1               if numberOfSections  gt  0  amp  amp  numberOfRows inSection  index   gt  0                   scrollToRow at  IndexPath row  0  section  index   at   top  animated  true                  break                            if index    numberOfSections - 1                   setContentOffset  zero  animated  true                  break

User · Answer

If you i would like move scroll animation in the table  use this code  The scroll move to top with animation in  5 seconds    UIView beginAnimations nil context nil    UIView setAnimationDuration 0 5    UIView setAnimationCurve UIViewAnimationCurveEaseOut      tableContent scrollRectToVisible CGRectMake 0  0  1  1  animated YES     UIView commitAnimations

User · Answer

func scrollToTop             NSIndexPath  topItem    NSIndexPath indexPathForItem 0 inSection 0            tableView scrollToRowAtIndexPath topItem atScrollPosition UITableViewScrollPositionTop animated YES       call this function wherever you want UITableView scroll to top

User · Answer

It s better to not use NSIndexPath  empty table   nor assume that top point is CGPointZero  content insets   that s what I use -   tableView setContentOffset CGPointMake 0 0f  -tableView contentInset top  animated YES     Hope this helps

User · Answer

Swift   tableView setContentOffset CGPointZero  animated  true

User · Answer

Use this code for UITableview implementation in swift   var cell   tableView dequeueReusableCellWithIdentifier    cell     if cell    nil       cell   UITableViewCell style   Value1  reuseIdentifier     cell

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Possible Actions    1     func scrollToFirstRow         let indexPath   NSIndexPath forRow  0  inSection  0      self tableView scrollToRowAtIndexPath indexPath  atScrollPosition   Top  animated  true      2    func scrollToLastRow         let indexPath   NSIndexPath forRow  objects count - 1  inSection  0      self tableView scrollToRowAtIndexPath indexPath  atScrollPosition   Bottom  animated  true      3      func scrollToSelectedRow         let selectedRows   self tableView indexPathsForSelectedRows     if let selectedRow   selectedRows  0  as  NSIndexPath           self tableView scrollToRowAtIndexPath selectedRow  atScrollPosition   Middle  animated  true            4     func scrollToHeader         self tableView scrollRectToVisible CGRect x  0  y  0  width  1  height  1   animated  true      5   func scrollToTop        self tableView setContentOffset CGPointMake 0   UIApplication sharedApplication   statusBarFrame height    animated  true      Disable Scroll To Top   func disableScrollsToTopPropertyOnAllSubviewsOf view  UIView        for subview in view subviews           if let scrollView   subview as  UIScrollView                scrollView as UIScrollView  scrollsToTop   false                   self disableScrollsToTopPropertyOnAllSubviewsOf subview as UIView            Modify and use it as per requirement   Swift 4    func scrollToFirstRow         let indexPath   IndexPath row  0  section  0      self tableView scrollToRow at  indexPath  at   top  animated  true

User · Answer

Swift 4 via extension  handles empty table view   extension UITableView       func scrollToTop animated  Bool            self setContentOffset CGPoint zero  animated  animated

User · Answer

Here is a simple example of UIScrollView extension that you can use everywhere in your app   1  First you should create enum with possible scroll directions   enum ScrollDirection       case top  right  bottom  left      func contentOffsetWith   scrollView  UIScrollView  - gt  CGPoint           var contentOffset   CGPoint zero         switch self               case  top                  contentOffset   CGPoint x  0  y  -scrollView contentInset top              case  right                  contentOffset   CGPoint x  scrollView contentSize width - scrollView bounds size width  y  0              case  bottom                  contentOffset   CGPoint x  0  y  scrollView contentSize height - scrollView bounds size height              case  left                  contentOffset   CGPoint x  -scrollView contentInset left  y  0                        return contentOffset           2  Then add extension to UIScrollView   extension UIScrollView       func scrollTo direction  ScrollDirection  animated  Bool   true            self setContentOffset direction contentOffsetWith self   animated  animated            3  Thats it  Now you can use it   myScrollView scrollTo  top  animated  false    This scroll bind to the tableView s content size and it looks more natural than scroll to CGPoint zero

User · Answer

This code let s you scroll a specific section to top  CGRect cellRect    tableinstance rectForSection section   CGPoint origin    tableinstacne convertPoint cellRect origin                                      fromView  lt tableistance gt     tableinstance setContentOffset CGPointMake 0  origin y

User · Answer

I ve encountered an issue calling trying some of the methods on an empty tableView  Here s another option for Swift 4 that handles empty tableviews   extension UITableView     func hasRowAtIndexPath indexPath  IndexPath  - gt  Bool       return indexPath section  lt  self numberOfSections  amp  amp  indexPath row  lt  self numberOfRows inSection  indexPath section         func scrollToTop animated  Bool        let indexPath   IndexPath row  0  section  0      if self hasRowAtIndexPath indexPath  indexPath          self scrollToRow at  indexPath  at   top  animated  animated                Usage      from yourViewController or yourTableViewController tableView scrollToTop animated  true   or false

User · Answer

In Swift 5   Thanks  Adrian s answer a lot  extension UITableView       func hasRowAtIndexPath indexPath  IndexPath  - gt  Bool           return indexPath section  lt  numberOfSections  amp  amp  indexPath row  lt  numberOfRows inSection  indexPath section             func scrollToTop   animated  Bool   false            let indexPath   IndexPath row  0  section  0          if hasRowAtIndexPath indexPath  indexPath                scrollToRow at  indexPath  at   top  animated  animated                       Usage   tableView scrollToTop

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Here s what I use to work correctly on iOS 11   extension UIScrollView       func scrollToTop animated  Bool            var offset   contentOffset         if  available iOS 11                   offset y   -adjustedContentInset top           else               offset y   -contentInset top                   setContentOffset offset  animated  animated

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With Swift   self scripSearchView quickListTbl  scrollToRowAtIndexPath indexPath  atScrollPosition   Top  animated  true

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Swift 5  iOS 13 I know this question already has a lot of answers but from my experience this method always works  let last   IndexPath row  someArray count - 1  section  0  tableView scrollToRow at  last  at   bottom  animated  true   And this is especially true if you re working with animations  like keyboard  or certain async tasks   the other answers will often scroll to the almost bottom  If for some reason this doesn t get you all the way to the bottom  it s almost certainly because of a competing animation so the workaround is to dispatch this animation to the end of the main queue  DispatchQueue main async       let last   IndexPath row  self someArray count - 1  section  0      self tableView scrollToRow at  last  at   bottom  animated  true     This may seem redundant since you re already on the main queue but it s not because it serializes the animations

User · Answer

For tables that have a contentInset  setting the content offset to CGPointZero will not work  It ll scroll to the content top vs  scrolling to the table top   Taking content inset into account produces this instead    tableView setContentOffset CGPointMake 0  -tableView contentInset top  animated NO

User · Answer

Adding on to what s already been said  you can create a extension  Swift  or category  Objective C  to make this easier in the future   Swift   extension UITableView       func scrollToTop animated  Bool            setContentOffset CGPointZero  animated  animated            Any time you want to scroll any given tableView to the top you can call the following code   tableView scrollToTop animated  true

User · Answer

Note  This answer isn t valid for iOS 11 and later   I prefer   mainTableView setContentOffset CGPointZero animated YES     If you have a top inset on your table view  you have to subtract it    mainTableView setContentOffset CGPointMake 0 0f  -mainTableView contentInset top  animated YES

User · Answer

To have a completion when finished  add this extension     MARK  - UIScrollView  extension UIScrollView            Animate scroll to top with completion                 - Parameters            - duration    TimeInterval           - completion  Completion block     func animateScrollToTop withDuration duration   TimeInterval                              completion               escaping    - gt                 UIView animate withDuration  duration  animations     weak self  in                 self  setContentOffset CGPoint zero  animated  false                 completion    finish in                 guard finish else                       return                                   completion                       tableView animateScrollToTop withDuration  0 25            Finish

User · Answer

On iOS 11  use adjustedContentInset to correctly scroll to top for both cases when the in-call status bar is visible or not   if   available iOS 11 0             tableView setContentOffset CGPointMake 0  -tableView adjustedContentInset top  animated YES     else        tableView setContentOffset CGPointMake 0  -tableView contentInset top  animated YES       Swift   if  available iOS 11 0           tableView setContentOffset CGPoint x  0  y  -tableView adjustedContentInset top   animated  true    else       tableView setContentOffset CGPoint x  0  y  -tableView contentInset top   animated  true

User · Answer

UITableView is a subclass of UIScrollView  so you can also use    mainTableView scrollRectToVisible CGRectMake 0  0  1  1  animated YES     Or   mainTableView setContentOffset CGPointZero animated YES     And in Swift   mainTableView setContentOffset CGPointZero  animated true    And in Swift 3  amp  above   mainTableView setContentOffset  zero  animated  true

User · Answer

In Swift-3    self tableView setContentOffset CGPoint zero  animated  true

User · Answer

Here Is The Code To ScrollTableView To Top Programatically  Swift   self TableView setContentOffset CGPointMake 0  1   animated true

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If you don t want scrolling  you can start and stop the scrolling animation as soon as you start it          document   ready function            html  body   animate   scrollTop  0    500       return true            Also  to animate put values for  x  and  y   passing in 0 0 will scroll the page to the top left instantly   window scrollTo x  y

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I prefer the following  as it takes into account an inset  If there is no inset  it will still scroll to the top as the inset will be 0   tableView setContentOffset CGPoint x  0  y  -tableView contentInset top   animated  true

[ios] UITableView - scroll to the top

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