How to scroll to the bottom of a UITableView on the iPhone before the view appears

Question

I have a UITableView that is populated with cells of a variable height  I would like the table to scroll to the bottom when the view is pushed into view   I currently have the following function  NSIndexPath  indexPath    NSIndexPath indexPathForRow  log count -1 inSection 0    self table scrollToRowAtIndexPath indexPath atScrollPosition UITableViewScrollPositionBottom animated NO     log is a mutable array containing the objects that make up the content of each cell   The above code works fine in viewDidAppear however this has the unfortunate side effect of displaying the top of the table when the view first appears and then jumping to the bottom  I would prefer it if the table view could be scrolled to the bottom before it appears   I tried the scroll in viewWillAppear and viewDidLoad but in both cases the data has not been loaded into the table yet and both throw an exception   Any guidance would be much appreciated  even if it s just a case of telling me what I have is all that is possible

User · Answer

In Swift  you just need  self tableView scrollToNearestSelectedRowAtScrollPosition UITableViewScrollPosition Bottom  animated  true    to make it automatically scroll to the buttom

User · Answer

After a lot of fiddling this is what worked for me   var viewHasAppeared   false  override func viewDidLayoutSubviews         super viewDidLayoutSubviews       if  viewHasAppeared   goToBottom        override func viewDidAppear animated  Bool        super viewDidAppear animated      viewHasAppeared   true    private func goToBottom         guard data count  gt  0 else   return       let indexPath   NSIndexPath forRow  data count - 1  inSection  0      tableView scrollToRowAtIndexPath indexPath  atScrollPosition   Bottom  animated  false      tableView layoutIfNeeded       The key turned out to be not wrapping scrollToRowAtIndexPath inside of dispatch async as some have suggested  but simply following it with a call to layoutIfNeeded   My understanding of this is  calling the scroll method in the current thread guarantees that the scroll offset is set immediately  before the view is displayed  When I was dispatching to the main thread  the view was getting displayed for an instant before the scroll took effect    Also NB you need the viewHasAppeared flag because you don t want to goToBottom every time viewDidLayoutSubviews is called  It gets called for example whenever the orientation changes

User · Answer

If you need to scroll to the EXACT end of the content  you can do it like this   -  void scrollToBottom       CGFloat yOffset   0       if  self tableView contentSize height  gt  self tableView bounds size height            yOffset   self tableView contentSize height - self tableView bounds size height              self tableView setContentOffset CGPointMake 0  yOffset  animated NO

User · Answer

In iOS this worked fine for me  CGFloat height   self inputTableView contentSize height  if  height  gt  CGRectGetHeight self inputTableView frame         height -   CGRectGetHeight self inputTableView frame  - CGRectGetHeight self navigationController navigationBar frame      else       height   0     self inputTableView setContentOffset CGPointMake 0  height  animated animated     It needs to be called from viewDidLayoutSubviews

User · Answer

If you have to load the data asynchronously prior to scrolling down  here s the possible solution   tableView alpha   0    We want animation  lastMessageShown   false    This is ivar  viewModel fetch    unowned self  result in     self tableView reloadData        if  self lastMessageShown           dispatch async dispatch get main queue       unowned self  in             if self rowCount  gt  0                   self tableView scrollToRowAtIndexPath NSIndexPath forRow  self rowCount  inSection  0   atScrollPosition   Bottom  animated  false                             UIView animateWithDuration 0 1                    self tableView alpha   1                 self lastMessageShown   true    Do it once

User · Answer

Function on swift 3 scroll to bottom   override func viewWillAppear   animated  Bool            super viewWillAppear false            scroll down         if lists count  gt  2               let numberOfSections   self tableView numberOfSections             let numberOfRows   self tableView numberOfRows inSection  numberOfSections-1              let indexPath   IndexPath row  numberOfRows-1   section  numberOfSections-1              self tableView scrollToRow at  indexPath  at  UITableViewScrollPosition middle  animated  true

User · Answer

Details   Xcode 8 3 2  swift 3 1 Xcode 10 2  10E125   Swift 5   Code  import UIKit  extension UITableView       func scrollToBottom animated  Bool            let y   contentSize height - frame size height         if y  lt  0   return           setContentOffset CGPoint x  0  y  y   animated  animated            Usage  tableView scrollToBottom animated  true    Full sample     Do not forget to paste solution code    import UIKit  class ViewController  UIViewController        private weak var tableView  UITableView      private lazy var cellReuseIdentifier    CellReuseIdentifier       override func viewDidLoad             super viewDidLoad           let tableView   UITableView frame  view frame          view addSubview tableView          tableView register UITableViewCell self  forCellReuseIdentifier  cellReuseIdentifier          self tableView   tableView         tableView dataSource   self         tableView performBatchUpdates nil     weak self  result in             if result   self  tableView  scrollToBottom animated  true                       extension ViewController  UITableViewDataSource        func numberOfSections in tableView  UITableView  - gt  Int           return 1            func tableView   tableView  UITableView  numberOfRowsInSection section  Int  - gt  Int           return 100            func tableView   tableView  UITableView  cellForRowAt indexPath  IndexPath  - gt  UITableViewCell           let cell   tableView dequeueReusableCell withIdentifier  cellReuseIdentifier  for  indexPath           cell textLabel  text      indexPath           return cell

User · Answer

Is of course a Bug  Probably somewhere in your code you use table estimatedRowHeight   value  for example 100   Replace this value by the highest value you think a row height could get  for example 500   This should solve the problem in combination with following code     auto scroll down example let delay   0 1   Double NSEC PER SEC  let time   dispatch time DISPATCH TIME NOW  Int64 delay    dispatch after time  dispatch get main queue          self table scrollToRowAtIndexPath NSIndexPath forRow  self Messages count - 1  inSection  0   atScrollPosition  UITableViewScrollPosition Bottom  animated  false

User · Answer

I think the easiest way is this   if  self messages count  gt  0         self tableView          scrollToRowAtIndexPath  NSIndexPath indexPathForRow self messages count-1          inSection 0           atScrollPosition UITableViewScrollPositionBottom animated YES       Swift 3 Version   if messages count  gt  0       userDefinedOptionsTableView scrollToRow at  IndexPath item messages count-1  section  0   at   bottom  animated  true

User · Answer

I believe old solutions do not work with swift3    If you know number rows in table you can use     tableView scrollToRow      at  IndexPath item  listCountInSection-1  section  sectionCount - 1         at   top       animated  true

User · Answer

Here s an extension that I implemented in Swift 2 0   These functions should be called after the tableview has been loaded   import UIKit  extension UITableView       func setOffsetToBottom animated  Bool            self setContentOffset CGPointMake 0  self contentSize height - self frame size height   animated  true             func scrollToLastRow animated  Bool            if self numberOfRowsInSection 0   gt  0               self scrollToRowAtIndexPath NSIndexPath forRow  self numberOfRowsInSection 0  - 1  inSection  0   atScrollPosition   Bottom  animated  animated

User · Answer

No need for any scrolling you can just do it by using this code    YOURTABLEVIEWNAME setContentOffset CGPointMake 0  CGFLOAT MAX

User · Answer

In one line  tableView scrollToRow at  IndexPath row  data count - 1  section  0   at   bottom  animated  true   This code is IMHO more clear than the accepted answer

User · Answer

I believe that calling   tableView setContentOffset CGPoint x  0  y  CGFloat greatestFiniteMagnitude   animated  false    will do what you want

User · Answer

Swift 5 Here is a simple way to solve this problem Steps - gt  1- When ViewDidLoad    Then it will scroll 2- customTableView is IBoutlet s tableView var data   String      quot Hello quot    quot This quot   quot is quot   quot Your quot   quot World quot      override func viewDidLoad        super viewDidLoad      3- In viewDidLoad we need to tell about indexPath        data count-1 will give last cell     let indexPath   IndexPath row  data count - 1  section 0          1st Parameter   at  will use for indexPath        2nd Parameter   at  will use for position s scroll view        3rd Parameter   animated  will show animation when screen will appear     customtableView scrollToRow at indexPath  at  top  animated true          Reload CustomTableView    customTableView reloadData

User · Answer

On iOS 12 the accepted answer seems to be broken  I had it working with the following extension    import UIKit  extension UITableView       public func scrollToBottom animated  Bool   true            guard let dataSource   dataSource else               return                    let sections   dataSource numberOfSections  in  self     1         let rows   dataSource tableView self  numberOfRowsInSection  sections-1          let bottomIndex   IndexPath item  rows - 1  section  sections - 1           scrollToRow at  bottomIndex                      at   bottom                      animated  animated

User · Answer

Use this simple code to scroll tableView bottom  NSInteger rows    tableName numberOfRowsInSection 0   if rows  gt  0         tableName scrollToRowAtIndexPath  NSIndexPath indexPathForRow rows-1 inSection 0                       atScrollPosition UITableViewScrollPositionBottom                              animated YES

User · Answer

self tableViewInfo scrollRectToVisible CGRectMake 0  self tableViewInfo contentSize height-self tableViewInfo height  self tableViewInfo width  self tableViewInfo height  animated YES

User · Answer

I found another good way  as follows   func yourFunc           tableView reloadData       self perform  selector scrollToBottom   with  nil  afterDelay  0 1      objc func scrollToBottom         self tableView scrollToRow at  IndexPath row  0  section  self mesArr count - 1   at   bottom  animated  false

User · Answer

In Swift 3 0  self tableViewFeeds setContentOffset CGPoint x  0  y  CGFLOAT MAX   animated  true

User · Answer

Actually a  Swifter  way to do it in swift is    var lastIndex   NSIndexPath forRow  self messages count - 1  inSection  0  self messageTableView scrollToRowAtIndexPath lastIndex  atScrollPosition  UITableViewScrollPosition Bottom  animated  true    work Perfect for me

User · Answer

Using the above solutions  this will scroll to the bottom of your table  only if the table content is loaded first      Scroll to bottom of table CGSize tableSize   myTableView contentSize   myTableView setContentOffset CGPointMake 0  tableSize height

User · Answer

func scrollToBottom          let sections   self chatTableView numberOfSections      if sections  gt  0            let rows   self chatTableView numberOfRows inSection  sections - 1           let last   IndexPath row  rows - 1  section  sections - 1           DispatchQueue main async                self chatTableView scrollToRow at  last  at   bottom  animated  false                      you should add   DispatchQueue main async               self chatTableView scrollToRow at  last  at   bottom  animated  false              or it will not scroll to bottom

User · Answer

I wanted the table to load with the end of the table shown in the frame  I found using  NSIndexPath  scrollIndexPath    NSIndexPath indexPathForRow   self tableView numberOfRowsInSection 0  - 1  inSection 0     self tableView  scrollToRowAtIndexPath scrollIndexPath atScrollPosition UITableViewScrollPositionBottom animated NO     did not work because it gave an error when table height was less than the frame height  Note my table only has one section   The solution that worked for me was implement the following code in viewWillAppear   -  void viewWillAppear  BOOL animated    super viewWillAppear animated      on the initial cell load scroll to the last row  ie the latest Note  if  initialLoad  TRUE        initialLoad FALSE       NSIndexPath  scrollIndexPath    NSIndexPath indexPathForRow   self tableView numberOfRowsInSection 0  - 1  inSection 0         self tableView  scrollToRowAtIndexPath scrollIndexPath atScrollPosition UITableViewScrollPositionBottom animated NO           CGPoint offset   CGPointMake 0   1000000 0             self tableView setContentOffset offset animated NO             The BOOL ivar initialLoad is set to TRUE in viewDidLoad

User · Answer

For Swift   if tableView contentSize height  gt  tableView frame size height       let offset   CGPoint x  0  y  tableView contentSize height - tableView frame size height      tableView setContentOffset offset  animated  false

User · Answer

In swift 3 0  If you want to go any particular Cell of tableview Change cell index Value like change  self yourArr count  value    self yourTable reloadData   self scrollToBottom    func scrollToBottom        DispatchQueue global qos   background  async           let indexPath   IndexPath row  self yourArr count-1  section  0          self tblComment scrollToRow at  indexPath  at   bottom  animated  true

User · Answer

The accepted solution by  JacobRelkin didn t work for me in iOS 7 0 using Auto Layout   I have a custom subclass of UIViewController and added an instance variable  tableView as a subview of its view  I positioned  tableView using Auto Layout  I tried calling this method at the end of viewDidLoad and even in viewWillAppear   Neither worked    So  I added the following method to my custom subclass of UIViewController   -  void tableViewScrollToBottomAnimated  BOOL animated       NSInteger numberOfRows     tableView numberOfRowsInSection 0       if  numberOfRows              tableView scrollToRowAtIndexPath  NSIndexPath indexPathForRow numberOfRows-1 inSection 0  atScrollPosition UITableViewScrollPositionBottom animated animated             Calling  self tableViewScrollToBottomAnimated NO  at the end of viewDidLoad works  Unfortunately  it also causes tableView heightForRowAtIndexPath  to get called three times for every cell

User · Answer

Thanks Jacob for the answer  really helpfull if anyone interesting with monotouch c  version       private void SetScrollPositionDown         if  tblShoppingListItem ContentSize Height  gt  tblShoppingListItem Frame Size Height            PointF offset   new PointF 0  tblShoppingListItem ContentSize Height - tblShoppingListItem Frame Size Height           tblShoppingListItem SetContentOffset offset true

User · Answer

The accepted answer didn t work with my table  thousands of rows  dynamic loading  but the code below works   -  void scrollToBottom  id sender       if   self sections count   gt  0            NSInteger idx    self sections count  - 1          CGRect sectionRect    self tableView rectForSection idx           sectionRect size height   self tableView frame size height           self tableView scrollRectToVisible sectionRect animated NO

User · Answer

For Swift 3   Xcode 8 1     override func viewDidAppear   animated  Bool        let numberOfSections   self tableView numberOfSections     let numberOfRows   self tableView numberOfRows inSection  numberOfSections-1       let indexPath   IndexPath row  numberOfRows-1   section  numberOfSections-1      self tableView scrollToRow at  indexPath  at  UITableViewScrollPosition middle  animated  true

User · Answer

You should use UITableViewScrollPositionBottom instead

User · Answer

From Jacob s answer  this is the code   -  void  viewDidAppear  BOOL animated        super viewDidAppear animated        if  self messagesTableView contentSize height  gt  self messagesTableView frame size height                 CGPoint offset   CGPointMake 0  self messagesTableView contentSize height - self messagesTableView frame size height            self messagesTableView setContentOffset offset animated YES

User · Answer

If you are setting up frame for tableview programmatically  make sure you are setting frame correctly

User · Answer

I m using autolayout and none of the answers worked for me  Here is my solution that finally worked    property  nonatomic  assign  BOOL shouldScrollToLastRow    -  void viewDidLoad        super viewDidLoad         shouldScrollToLastRow   YES      -  void viewDidLayoutSubviews        super viewDidLayoutSubviews           Scroll table view to the last row     if   shouldScrollToLastRow                 shouldScrollToLastRow   NO           self tableView setContentOffset CGPointMake 0  CGFLOAT MAX

User · Answer

The safest way to scroll at the bottom of tableView is to use  tableView scrollRectToVisible   Use after calling tableView reloadData    In Swift 5  private func scrollAtTheBottom         let lastIndexPath   IndexPath row  state myItemsArray count - 1  section  0      let lastCellPosition   tableView rectForRow at  lastIndexPath      tableView scrollRectToVisible lastCellPosition  animated  true

[ios] How to scroll to the bottom of a UITableView on the iPhone before the view appears

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