Remove all subviews

Question

When my app gets back to its root view controller  in the viewDidAppear  method I need to remove all subviews   How can I do this

User · Answer

If you want to remove all the subviews on your UIView  here yourView   then write this code at your button click     yourView subviews  makeObjectsPerformSelector   selector removeFromSuperview

User · Answer

For ios6 using autolayout I had to add a little bit of code to remove the constraints too   NSMutableArray   constraints to remove         mutableCopy    for  NSLayoutConstraint   constraint in tagview constraints        if   tagview subviews containsObject constraint firstItem             tagview subviews containsObject constraint secondItem               constraints to remove addObject constraint            tagview removeConstraints constraints to remove       tagview subviews  makeObjectsPerformSelector  selector removeFromSuperview      I m sure theres a neater way to do this  but it worked for me  In my case I could not use a direct  tagview removeConstraints tagview constraints  as there were constraints set in XCode that were getting cleared

User · Answer

In monotouch   xamarin ios this worked for me   SomeParentUiView Subviews All x   gt  x RemoveFromSuperview

User · Answer

Using Swift UIView extension   extension UIView       func removeAllSubviews             for subview in subviews               subview removeFromSuperview

User · Answer

In order to remove all subviews Syntax    -  void makeObjectsPerformSelector  SEL aSelector    Usage     self View subviews makeObjectsPerformSelector  selector removeFromSuperview      This method is present in NSArray h file and uses NSArray NSExtendedArray  interface

User · Answer

Edit  With thanks to cocoafan  This situation is muddled up by the fact that NSView and UIView handle things differently  For NSView  desktop Mac development only   you can simply use the following    someNSView setSubviews  NSArray array      For UIView  iOS development only   you can safely use makeObjectsPerformSelector  because the subviews property will return a copy of the array of subviews     someUIView subviews   makeObjectsPerformSelector  selector removeFromSuperview      Thank you to Tommy for pointing out that makeObjectsPerformSelector  appears to modify the subviews array while it is being enumerated  which it does for NSView  but not for UIView    Please see this SO question for more details   Note  Using either of these two methods will remove every view that your main view contains and release them  if they are not retained elsewhere  From Apple s documentation on removeFromSuperview      If the receiver   s superview is not nil  this method releases the receiver  If you plan to reuse the view  be sure to retain it before calling this method and be sure to release it as appropriate when you are done with it or after adding it to another view hierarchy

User · Answer

view subviews forEach    0 removeFromSuperview

User · Answer

This does only apply to OSX since in iOS a copy of the array is kept  When removing all the subviews  it is a good idea to start deleting at the end of the array and keep deleting until you reach the beginning  This can be accomplished with this two lines of code   for  int i mySuperView subviews count-1  i gt  0  i--            mySuperView subviews objectAtIndex i  removeFromSuperview     SWIFT 1 2  for var i mySuperView subviews count-1  i gt  0  i--       mySuperView subviews i  removeFromSuperview        or  less efficient  but more readable   for subview in mySuperView subviews reverse         subview removeFromSuperview       NOTE  You should NOT remove the subviews in normal order  since it may cause a crash if a UIView instance is deleted before the removeFromSuperview message has been sent to all objects of the array   Obviously  deleting the last element would not cause a crash    Therefore  the code    someUIView subviews  makeObjectsPerformSelector  selector removeFromSuperview      should NOT be used    Quote from Apple documentation about makeObjectsPerformSelector      Sends to each object in the array the message identified by a given   selector  starting with the first object and continuing through the   array to the last object     which would be the wrong direction for this purpose

User · Answer

If you re using Swift  it s as simple as   subviews map    0 removeFromSuperview     It s similar in philosophy to the makeObjectsPerformSelector approach  however with a little more type safety

User · Answer

In objective-C  go ahead and create a category method off of the UIView class   -  void removeAllSubviews       for  UIView  subview in self subviews           subview removeFromSuperview

User · Answer

In Swift you can use a functional approach like this   view subviews forEach    0 removeFromSuperview       As a comparison  the imperative approach would look like this   for subview in view subviews       subview removeFromSuperview       These code snippets only work in iOS   tvOS though  things are a little different on macOS

User · Answer

Use the Following code to remove all subviews   for  UIView  view in  self view subviews        view removeFromSuperview

User · Answer

In order to remove all subviews from superviews   NSArray  oSubView    self subviews   for int iCount   0  iCount  lt   oSubView count   iCount          id object    oSubView objectAtIndex iCount        object removeFromSuperview       iCount--

User · Answer

Try this way swift 2 0  view subviews forEach    0 removeFromSuperview

User · Answer

Get all the subviews from your root controller and send each a removeFromSuperview   NSArray  viewsToRemove    self view subviews   for  UIView  v in viewsToRemove         v removeFromSuperview

[ios] Remove all subviews?

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