Change UITableView height dynamically

Question

I want to change the height of my tableview from another viewcontroller based on the sum of its cells  heights  as they are dynamic  Is it at all possible  Thanks  Add-on   What I basically have is a UserProfileViewController that has a containerview on half of the screen  There I add different other viewcontrollers        In the case of the wall button this is how I add the viewcontroller and it s subsequent tableview   -  IBAction wallButtonPressed  id sender         Check if there is an instance of the viewcontroller we want to display  If not make one and set it s tableview frame to the container s view bounds     if   userWallViewController            self userWallViewController     WallViewController alloc  init             self userWallViewController activityFeedTableView frame   self containerView bounds               self userWallViewController containerView addSubview self userWallViewController activityFeedTableView         If the currentviewcontroller adn it s view are already added to the hierarchy remove them      self currentViewController view removeFromSuperview        self currentViewController removeFromParentViewController          Add the desired viewcontroller to the currentviewcontroller     self currentViewController   self userWallViewController         Pass the data needed for the desired viewcontroller to it s instances     self userWallViewController searchURLString    NSString stringWithFormat   event user       self userID       self userWallViewController sendCommentURLString    NSString stringWithFormat   event message      self userID         self userWallViewController activityFeedTableView reloadData        self userWallViewController totalCellHeight     float totalCellHeight            self scrollView contentSize   CGSizeMake 320 0  totalCellHeight           CGRect newFrame   self userWallViewController containerView frame          newFrame size height   totalCellHeight   33 0          self userWallViewController containerView frame   newFrame           self userWallViewController activityFeedTableView frame   self containerView bounds                Add this containerview to the desired viewcontroller s containerView     self userWallViewController containerView   self containerView          Add the needed viewcontroller and view to the parent viewcontroller and the containerview      self addChildViewController self userWallViewController        self containerView addSubview self userWallViewController view          CLEAN UP THE CONTAINER VIEW BY REMOVING THE PREVIOUS ADDED TABLE VIEWS      self userFansViewController userSimpleTableView removeFromSuperview        self fanOfViewController userSimpleTableView removeFromSuperview        self userPublishedMovellaListViewController gridView removeFromSuperview         self userPublishedMovellaListViewController removeFromParentViewController        self userPublishedMovellaListViewController   nil      and in that viewcontroller this is where I initialize my tableview   - UITableView   activityFeedTableView       if    activityFeedTableView             activityFeedTableView     UITableView alloc  initWithFrame CGRectMake 0 0  0 0  320 0  850 0  style UITableViewStylePlain             return  activityFeedTableView      I am calculating he total sum of the cell s height  the problem is that the cell s height method is called way after the getter of te tableview is called  So I would need some sort of way to know when the cells  height method is done for all cells and then I can resize my tableview  Thanks

User · Answer

I found adding constraint programmatically much easier than in storyboard       var leadingMargin   NSLayoutConstraint item  self tableView  attribute  NSLayoutAttribute LeadingMargin  relatedBy  NSLayoutRelation Equal  toItem  self mView  attribute  NSLayoutAttribute LeadingMargin  multiplier  1  constant  0 0       var trailingMargin   NSLayoutConstraint item  self tableView  attribute  NSLayoutAttribute TrailingMargin  relatedBy  NSLayoutRelation Equal  toItem  mView  attribute  NSLayoutAttribute TrailingMargin  multiplier  1  constant  0 0       var height   NSLayoutConstraint item  self tableView  attribute  NSLayoutAttribute Height  relatedBy  NSLayoutRelation Equal  toItem  nil  attribute  NSLayoutAttribute NotAnAttribute  multiplier  1  constant  screenSize height - 55       var bottom   NSLayoutConstraint item  self tableView  attribute  NSLayoutAttribute BottomMargin  relatedBy  NSLayoutRelation Equal  toItem  self mView  attribute  NSLayoutAttribute BottomMargin  multiplier  1  constant  screenSize height - 200       var top   NSLayoutConstraint item  self tableView  attribute  NSLayoutAttribute TopMargin  relatedBy  NSLayoutRelation Equal  toItem  self mView  attribute  NSLayoutAttribute TopMargin  multiplier  1  constant  250       self view addConstraint leadingMargin      self view addConstraint trailingMargin      self view addConstraint height      self view addConstraint bottom      self view addConstraint top

User · Answer

There isn t a system feature to change the height of the table based upon the contents of the tableview  Having said that  it is possible to programmatically change the height of the tableview based upon the contents  specifically based upon the contentSize of the tableview  which is easier than manually calculating the height yourself   A few of the particulars vary depending upon whether you re using the new autolayout that s part of iOS 6  or not   But assuming you re configuring your table view s underlying model in viewDidLoad  if you want to then adjust the height of the tableview  you can do this in viewDidAppear   -  void viewDidAppear  BOOL animated        super viewDidAppear animated         self adjustHeightOfTableview       Likewise  if you ever perform a reloadData  or otherwise add or remove rows  for a tableview  you d want to make sure that you also manually call adjustHeightOfTableView there  too  e g    -  IBAction onPressButton  id sender        self buildModel        self tableView reloadData         self adjustHeightOfTableview       So the question is what should our adjustHeightOfTableview do  Unfortunately  this is a function of whether you use the iOS 6 autolayout or not  You can determine if you have autolayout turned on by opening your storyboard or NIB and go to the  File Inspector   e g  press option command 1 or click on that first tab on the panel on the right      Let s assume for a second that autolayout was off  In that case  it s quite simple and adjustHeightOfTableview would just adjust the frame of the tableview   -  void adjustHeightOfTableview       CGFloat height   self tableView contentSize height      CGFloat maxHeight   self tableView superview frame size height - self tableView frame origin y          if the height of the content is greater than the maxHeight of        total space on the screen  limit the height to the size of the        superview       if  height  gt  maxHeight          height   maxHeight          now set the frame accordingly       UIView animateWithDuration 0 25 animations            CGRect frame   self tableView frame          frame size height   height          self tableView frame   frame              if you have other controls that should be resized moved to accommodate            the resized tableview  do that here  too             If your autolayout was on  though  adjustHeightOfTableview would adjust a height constraint for your tableview   -  void adjustHeightOfTableview       CGFloat height   self tableView contentSize height      CGFloat maxHeight   self tableView superview frame size height - self tableView frame origin y          if the height of the content is greater than the maxHeight of        total space on the screen  limit the height to the size of the        superview       if  height  gt  maxHeight          height   maxHeight          now set the height constraint accordingly       UIView animateWithDuration 0 25 animations            self tableViewHeightConstraint constant   height           self view setNeedsUpdateConstraints               For this latter constraint-based solution to work with autolayout  we must take care of a few things first    Make sure your tableview has a height constraint by clicking on the center button in the group of buttons here and then choose to add the height constraint    Then add an IBOutlet for that constraint    Make sure you adjust other constraints so they don t conflict if you adjust the size tableview programmatically  In my example  the tableview had a trailing space constraint that locked it to the bottom of the screen  so I had to adjust that constraint so that rather than being locked at a particular size  it could be greater or equal to a value  and with a lower priority  so that the height and top of the tableview would rule the day     What you do here with other constraints will depend entirely upon what other controls you have on your screen below the tableview  As always  dealing with constraints is a little awkward  but it definitely works  though the specifics in your situation depend entirely upon what else you have on the scene  But hopefully you get the idea  Bottom line  with autolayout  make sure to adjust your other constraints  if any  to be flexible to account for the changing tableview height    As you can see  it s much easier to programmatically adjust the height of a tableview if you re not using autolayout  but in case you are  I present both alternatives

User · Answer

for resizing my table I went with this solution in my tableview controller witch is perfectly fine    objectManager getObjectsAtPath self searchURLString                          parameters nil                             success   RKObjectRequestOperation  operation  RKMappingResult  mappingResult                                    NSArray  results    mappingResult array                                   self eventArray   results                                  NSLog   Events number at first   i    self eventArray count                                    CGRect newFrame   self activityFeedTableView frame                                  newFrame size height   self cellsHeight   30 0                                  self activityFeedTableView frame   newFrame                                   self cellsHeight   0 0                                                             failure   RKObjectRequestOperation  operation  NSError  error                                    UIAlertView  alert     UIAlertView alloc  initWithTitle   Error                                                                                  message  error localizedDescription                                                                                 delegate nil                                                                       cancelButtonTitle   OK                                                                        otherButtonTitles nil                                    alert show                                   NSLog   Hit error       error                                     The resizing part is in a method but here is just so you can see it   Now the only problem I haveis resizing the scroll view in the other view controller as I have no idea when the tableview has finished resizing  At the moment I m doing it with performSelector  afterDelay  but this is really not a good way to do it  Any ideas

User · Answer

create your cell by xib or storyboard  give it s outlet s contents  now call it in CellForRowAtIndexPath   eg  if you want to set cell height according to Comment s label text    so set you commentsLbl numberOfLine 0   so set you commentsLbl numberOfLine 0   then in ViewDidLoad   self table estimatedRowHeight   44 0   self table rowHeight   UITableViewAutomaticDimension    and now  - float tableView  UITableView   tableView heightForRowAtIndexPath  NSIndexPath   indexPath  return UITableViewAutomaticDimension

User · Answer

This can be massively simplified with just 1 line of code in viewDidAppear       override func viewDidAppear animated  Bool            super viewDidAppear animated           tableViewHeightConstraint constant   tableView contentSize height

User · Answer

Lots of the answers here don t honor changes of the table or are way too complicated  Using a subclass of UITableView that will properly set intrinsicContentSize is a far easier solution when using autolayout  No height constraints etc  needed   class UIDynamicTableView  UITableView       override var intrinsicContentSize  CGSize           self layoutIfNeeded           return CGSize width  UIViewNoIntrinsicMetric  height  self contentSize height             override func reloadData             super reloadData           self invalidateIntrinsicContentSize              Set the class of your TableView to UIDynamicTableView in the interface builder and watch the magic as this TableView will change it s size after a call to reloadData

User · Answer

Rob s solution is very nice  only thing that in his - void adjustHeightOfTableview method the calling of    self view needsUpdateConstraints    does nothing  it just returns a flag  instead calling   self view setNeedsUpdateConstraints    will make the desired effect

User · Answer

Use simple and easy code   func tableView tableView  UITableView  heightForRowAtIndexPath indexPath  NSIndexPath  - gt  CGFloat           let myCell   tableView dequeueReusableCellWithIdentifier  mannaCustumCell   as  CustomCell         let heightForCell   myCell bounds size height           return heightForCell

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