How to use auto-layout to move other views when a view is hidden

Question

I have designed my custom Cell in IB  subclassed it and connected my outlets to my custom class  I have three subviews in cell content which are  UIView  cdView  and two labels  titleLabel and emailLabel   Depending on data available for each row  sometimes I want to have UIView and two labels displayed in my cell and sometimes only two labels  What I am trying to do is to set constraints that way if I set UIView property to hidden or I will remove it from superview the two labels will move to the left  I tried to set UIView leading constraint to Superview  Cell content  for 10px and UILabels leading Constraints for 10 px to the next view  UIView   Later in my code   - UITableViewCell   tableView  UITableView   tableView cellForRowAtIndexPath  IndexPath   indexPath       Record  record    self records objectAtIndex indexPath row    if   record imageURL is equalToString              cell cdView hidden   YES      I am hiding my cell cdView and I would like the labels to move to the left however they are staying in the same position in Cell  I tried to remove cell cdView from superview but it didn t work either  I have attached image to clarify what I am about     I know how to do this programatically and I am not looking for that solution  What I want is to set constraints in IB and I expect that my subviews will move dynamically if other views are removed or hidden  Is it possible to do this in IB with auto-layout

User · Answer

In this case  I map the height of the Author label to an appropriate IBOutlet    property  retain  nonatomic  IBOutlet NSLayoutConstraint  authorLabelHeight    and when I set the height of the constraint to 0 0f  we preserve the  padding   because the Play button s height allows for it   cell authorLabelHeight constant   0

User · Answer

In my case I set the constant of the height constraint to 0 0f and also set the hidden property to YES   To show the view  with the subviews  again I did the opposite  I set the height constant to a non-zero value and set the hidden property to NO

User · Answer

Adding or removing constraints during runtime is a heavyweight operation that can affect performance  However  there is a simpler alternative   For the view you wish to hide  set up a width constraint  Constrain the other views with a leading horizontal gap to that view   To hide  update the  constant of the width constraint to 0 f  The other views will automatically move left to assume position   See my other answer here for more details   How to change label constraints during runtime

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My project uses a custom  IBDesignable subclass of UILabel  to ensure consistency in colour  font  insets etc   and I have implemented something like the following   override func intrinsicContentSize   - gt  CGSize       if hidden           return CGSizeZero       else           return super intrinsicContentSize             This allows the label subclass to take part in Auto Layout  but take no space when hidden

User · Answer

As no scene suggested  you can definitely do this by changing the priority of the constraint at runtime  This was much easier for me because I had more than one blocking view which would have to be removed   Here s a snippet using ReactiveCocoa   RACSignal  isViewOneHiddenSignal   RACObserve self viewModel  isViewOneHidden   RACSignal  isViewTwoHiddenSignal   RACObserve self viewModel  isViewTwoHidden   RACSignal  isViewThreeHiddenSignal   RACObserve self viewModel  isViewThreeHidden   RAC self viewOne  hidden    isViewOneHiddenSignal  RAC self viewTwo  hidden    isViewTwoHiddenSignal  RAC self viewThree  hidden    isViewThreeHiddenSignal   RAC self viewFourBottomConstraint  priority        RACSignal     combineLatest   isViewOneHiddenSignal                      isViewTwoHiddenSignal                      isViewThreeHiddenSignal       and      distinctUntilChanged      map  id NSNumber  allAreHidden            return  allAreHidden boolValue      780      UILayoutPriorityDefaultHigh            RACSignal  updateFramesSignal    RACObserve self viewFourBottomConstraint  priority  distinctUntilChanged    updateFramesSignal     subscribeNext   id x             strongify self            self view setNeedsUpdateConstraints            UIView animateWithDuration 0 3 animations                 self view layoutIfNeeded

User · Answer

Here s how I would re-align my uiviews to get your solution    Drag drop one UIImageView and place it to the left  Drag drop one UIView and place it to the right of UIImageView   Drag drop two UILabels inside that UIView whose leading and trailing constraints are zero  Set the leading constraint of UIView containing 2 labels to superview instead of UIImagView  IF UIImageView is hidden  set the leading constraint constant to 10 px to superview  ELSE  set the leading constraint constant to 10 px   UIImageView width   10 px    I created a thumb rule of my own  Whenever you have to hide   show any uiview whose constraints might be affected  add all the affected   dependent subviews inside a uiview and update its leading   trailing   top   bottom constraint constant programmatically

User · Answer

Use two UIStackView Horizontal and Vertical  when some subview view in stack is hidden other stack subviews will be moved  use Distribution -  Fill Proporionally for Vertical stack with two UILabels and need set width and height constaints for first UIView

User · Answer

It is possible  but you ll have to do a little extra work  There are a couple conceptual things to get out of the way first    Hidden views  even though they don t draw  still participate in Auto Layout and usually retain their frames  leaving other related views in their places  When removing a view from its superview  all related constraints are also removed from that view hierarchy    In your case  this likely means    If you set your left view to be hidden  the labels stay in place  since that left view is still taking up space  even though it s not visible   If you remove your left view  your labels will probably be left ambiguously constrained  since you no longer have constraints for your labels  left edges    What you need to do is judiciously over-constrain your labels  Leave your existing constraints  10pts space to the other view  alone  but add another constraint  make your labels  left edges 10pts away from their superview s left edge with a non-required priority  the default high priority will probably work well    Then  when you want them to move left  remove the left view altogether  The mandatory 10pt constraint to the left view will disappear along with the view it relates to  and you ll be left with just a high-priority constraint that the labels be 10pts away from their superview  On the next layout pass  this should cause them to expand left until they fill the width of the superview but for your spacing around the edges   One important caveat  if you ever want your left view back in the picture  not only do you have to add it back into the view hierarchy  but you also have to reestablish all its constraints at the same time  This means you need a way to put your 10pt spacing constraint between the view and its labels back whenever that view is shown again

User · Answer

connect constraint between uiview and labels as IBOutlet and set priority member to a less value when set hidden   YES

User · Answer

UIStackView repositions its views automatically when the hidden property is changed on any of its subviews  iOS 9      UIView animateWithDuration 1 0       - gt  Void in    self mySubview hidden    self mySubview hidden     Jump to 11 48 in this WWDC video for a demo   Mysteries of Auto Layout  Part 1

User · Answer

Just use UIStackView and everything will be work fine  No need to worry about other constraint  UIStackView will handle the space automatically

User · Answer

For the Googlers  building on Max s answer  to solve the padding issue that many have noticed I simply increased the height of the label and used that height as the separator instead of actual padding  This idea could be expanded for any scenario with containing views   Here s a simple example     In this case  I map the height of the Author label to an appropriate IBOutlet    property  retain  nonatomic  IBOutlet NSLayoutConstraint  authorLabelHeight    and when I set the height of the constraint to 0 0f  we preserve the  padding   because the Play button s height allows for it

User · Answer

I think this is the most simple answer  Please verify that it works           StackFullView layer isHidden   true         Task TopSpaceSections constant   0      your constraint of top view   check here https   www youtube com watch v EBulMWMoFuw

User · Answer

What I ended up doing was creating 2 xibs  One with the left view and one without it  I registered both in the controller and then decided which to use during cellForRowAtIndexPath   They use the same UITableViewCell class  The downside is that there is some duplication of the content between the xibs  but these cells are pretty basic  The upside is that I don t have a bunch of code to manually manage removing view  updating constraints  etc   In general  this is probably a better solution since they are technically different layouts and therefore should have different xibs    self table registerNib  UINib nibWithNibName   TrackCell  bundle nil  forCellReuseIdentifier   TrackCell     self table registerNib  UINib nibWithNibName   TrackCellNoImage  bundle nil  forCellReuseIdentifier   TrackCellNoImage     TrackCell  cell    tableView dequeueReusableCellWithIdentifier  appDelegate showImages     TrackCell      TrackCellNoImage   forIndexPath indexPath

User · Answer

I will use horizontal stackview  It can remove the frame when the subview is hidden    In image below  the red view is the actual container for your content and has 10pt trailing space to orange superview  ShowHideView   then just connect ShowHideView to IBOutlet and show hide remove it programatically    This is when the view is visible installed       This is when the view is hidden not-installed

User · Answer

The easiest solution is to use UIStackView  horizontal   Add to stack view  first view and second view with labels   Then set isHidden property of first view to false   All constrains will be calculated and updates automatically

User · Answer

For those who support iOS 8  only  there is a new boolean property active  It will help to enable only needed constraints dynamically  P S  Constraint outlet must be strong  not weak  Example    IBOutlet weak var optionalView  UIView   IBOutlet var viewIsVisibleConstraint  NSLayoutConstraint   IBOutlet var viewIsHiddenConstraint  NSLayoutConstraint   func showView         optionalView isHidden   false     viewIsVisibleConstraint isActive   true     viewIsHiddenConstraint isActive   false    func hideView         optionalView isHidden   true     viewIsVisibleConstraint isActive   false     viewIsHiddenConstraint isActive   true     Also to fix an error in storyboard you ll need to uncheck Installed checkbox for one of these constraints   UIStackView  iOS 9    One more option is to wrap your views in UIStackView  Once view is hidden UIStackView will update layout automatically

User · Answer

the proper way to do it is to disable constraints with isActive   false  note however that deactivating a constraint removes and releases it  so you have to have strong outlets for them

User · Answer

Instead of hiding view  create the width constrain and change it to 0 in code when you want to hide the UIView  It may be the simplest way to do so  Also  it will preserve the view and you don t need to recreate it if you want to show it again  ideal to use inside table cells   To change the constant value you need to create a constant reference outlet  the same way as you do outlets for the view

User · Answer

Try this I have implemented below code    I have one View on ViewController in that added other three views  When any view is hidden other two view will move Follow below steps      1 ViewController h File    import  lt UIKit UIKit h gt   interface ViewController   UIViewController  property  strong  nonatomic  IBOutlet UIView  viewOne   property  strong  nonatomic  IBOutlet UIView  viewTwo   property  strong  nonatomic  IBOutlet UIView  viewThree   property  strong  nonatomic  IBOutlet NSLayoutConstraint  viewOneWidth   property  strong  nonatomic  IBOutlet NSLayoutConstraint  viewTwoWidth   property  strong  nonatomic  IBOutlet NSLayoutConstraint  viewThreeWidth   property  strong  nonatomic  IBOutlet NSLayoutConstraint  viewBottomWidth   end   2 ViewController m    import  ViewController h    interface ViewController        CGFloat viewOneWidthConstant    CGFloat viewTwoWidthConstant    CGFloat viewThreeWidthConstant    CGFloat viewBottomWidthConstant     end   implementation ViewController  synthesize viewOne  viewTwo  viewThree   -  void viewDidLoad      super viewDidLoad       Do any additional setup after loading the view  typically from a    nib           0  0   0    0  0   1    0  1   0    0  1   1    1  0   0    1  0   1    1  1   0    1  1   1                 viewOne setHidden NO            viewTwo setHidden NO            viewThree setHidden NO             viewOne setHidden NO            viewTwo setHidden NO            viewThree setHidden YES             viewOne setHidden NO            viewTwo setHidden YES            viewThree setHidden NO             viewOne setHidden NO            viewTwo setHidden YES            viewThree setHidden YES              viewOne setHidden YES            viewTwo setHidden NO            viewThree setHidden NO             viewOne setHidden YES            viewTwo setHidden NO            viewThree setHidden YES            viewOne setHidden YES           viewTwo setHidden YES           viewThree setHidden NO           viewOne setHidden YES          viewTwo setHidden YES          viewThree setHidden YES      self hideShowBottomBar        -  void hideShowBottomBar     BOOL isOne    viewOne isHidden    BOOL isTwo    viewTwo isHidden    BOOL isThree    viewThree isHidden     viewOneWidthConstant    viewOneWidth constant    viewTwoWidthConstant    viewTwoWidth constant    viewThreeWidthConstant    viewThreeWidth constant    viewBottomWidthConstant    viewBottomWidth constant      if  isOne  amp  amp  isTwo  amp  amp  isThree           0    0   0      viewOneWidth constant   viewBottomWidthConstant   3       viewTwoWidth constant   viewBottomWidthConstant   3       viewThreeWidth constant   viewBottomWidthConstant   3            else if  isOne  amp  amp  isTwo  amp  amp   isThree            0    0   1      viewOneWidth constant   viewBottomWidthConstant   2       viewTwoWidth constant   viewBottomWidthConstant   2       viewThreeWidth constant   0           else if  isOne  amp  amp   isTwo  amp  amp  isThree           0    1   0      viewOneWidth constant   viewBottomWidthConstant   2       viewTwoWidth constant   0       viewThreeWidth constant   viewBottomWidthConstant   2            else if  isOne  amp  amp   isTwo  amp  amp   isThree           0    1   1      viewOneWidth constant   viewBottomWidthConstant       viewTwoWidth constant   0       viewThreeWidth constant   0          else if   isOne  amp  amp  isTwo  amp  amp  isThree           1    0   0      viewOneWidth constant   0       viewTwoWidth constant   viewBottomWidthConstant   2       viewThreeWidth constant   viewBottomWidthConstant   2          else if   isOne  amp  amp  isTwo  amp  amp   isThree           1    0   1      viewOneWidth constant   0       viewTwoWidth constant   viewBottomWidthConstant       viewThreeWidth constant   0          else if   isOne  amp  amp   isTwo  amp  amp  isThree           1    1   0      viewOneWidth constant   0       viewTwoWidth constant   0       viewThreeWidth constant   viewBottomWidthConstant          else if  isOne  amp  amp  isTwo  amp  amp  isThree           1    1   1      viewOneWidth constant   0       viewTwoWidth constant   0       viewThreeWidth constant   0             -  void didReceiveMemoryWarning      super didReceiveMemoryWarning       Dispose of any resources that can be recreated       end           Hope So this logic will help some one

User · Answer

This is an old question but still I hope it will helps  Coming from Android  in this platform you have an handy method isVisible to hide it from the view but also not have the frame considered when the autolayout draw the view   using extension and  extend  uiview you could do a similar function in ios  not sure why it is not in UIKit already  here an implementation in swift 3       func isVisible   isVisible  Bool            self isHidden    isVisible         self translatesAutoresizingMaskIntoConstraints   isVisible         if isVisible     if visible we remove the hight constraint              if let constraint    self constraints filter  0 firstAttribute     height  first                   self removeConstraint constraint                          else     if not visible we add a constraint to force the view to have a hight set to 0             let height   NSLayoutConstraint item  self  attribute   height  relatedBy   equal   toItem  nil  attribute   notAnAttribute  multiplier  0  constant  0              self addConstraint height                    self layoutIfNeeded

User · Answer

In case this helps someone  I built a helper class for using visual format constraints  I m using it in my current app   AutolayoutHelper  It might be a bit tailored to my needs  but you might find it useful or you might want to modify it and create your own helper   I have to thank Tim for his answer above  this answer about UIScrollView and also this tutorial

User · Answer

This my another solution using priority constraint  The idea is set the width to 0    create container view  orange  and set width   create content view  red  and set trailing space 10pt to superview  orange   Notice trailing space constraints  there are 2 trailing constraint with different priority  Low  10  and High  lt  10   This is important to avoid ambiguity   Set orange view s width to 0 to hide the view

[ios] How to use auto-layout to move other views when a view is hidden?

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