UIScrollView not scrolling

Question

I have a UIScrollView which contains many UIImageViews  UILabels  etc    the labels are much longer that the UIScrollView  but when I run the app  I cannot click and scroll down     Why might this be   Thanks

User · Answer

I found that with this AutoLayout issue    if I just make the ViewController use UIView instead of UIScrollView for the class    then just add a UIScrollView myself    that it works

User · Answer

If none of the other solutions work for you  double check that your scroll view actually is a UIScrollView in Interface Builder   At some point in the last few days  my UIScrollView spontaneously changed type to a UIView  even though its class said UIScrollView in the inspector   I m using Xcode 5 1  5B130a    You can either create a new scroll view and copy the measurements  settings and constraints from the old view  or you can manually change your view to a UIScrollView in the xib file   I did a compare and found the following differences   Original    lt scrollView clipsSubviews  YES  multipleTouchEnabled  YES  contentMode  scaleToFill  directionalLockEnabled  YES  bounces  NO  pagingEnabled  YES  showsHorizontalScrollIndicator  NO  showsVerticalScrollIndicator  NO  translatesAutoresizingMaskIntoConstraints  NO  id  Wsk-WB-LMH  gt       lt  scrollView gt    After type spontaneously changed    lt view clearsContextBeforeDrawing  NO  contentMode  scaleToFill  translatesAutoresizingMaskIntoConstraints  NO  customClass  UIScrollView  id  qRn-TP-cXd  gt       lt  view gt    So I replaced the  lt view gt  line with my original  lt scrollView gt  line   I also replaced the view s close tag  lt  view gt  with  lt  scrollView gt    Be sure to keep the id the same as the current view  in this case  id  qRn-TP-cXd    I also had to flush the xib from Xcode s cache by deleting the app s derived data    Xcode- gt Window- gt Organizer- gt Projects  choose your project  on the Derived Data line  click Delete      Or if using a device    Xcode- gt Window- gt Organizer- gt Device  choose your device- Applications  choose your app  click  -    Now clean the project  and remove the app from the simulator device    Xcode- gt Product- gt Clean iOS Simulator device- gt press and hold the app- gt click the  X  to remove it   You should then be able to build and run your app and have scrolling functionality again   P S  I didn t have to set the scroll view s content size in viewDidLayoutSubviews or turn off auto layout  but YMMV

User · Answer

After failing with the provided answers in this thread  I stumbled upon this article with the solution   There are two things not intuitive about setting up the scrollview with autolayout    The constraints you set up as margin between the contentview and scrollview do not influence the size of the contentview  They really are margins  And to make it work  the contentview should have a fixed size  The trick to the fixed size is that you can set the width of the contentview equal to that of the scrollview s parent  Just select both views in the tree on the left and add the equal widths constraint    This is the gist of that article  For a complete explanation  including illustrations  check it out

User · Answer

I had the same issue in IB   After setting the leading  trailing  top and bottom of the scrollView to its superView  I made the following changes to make the containerView scrollable  which worked   To make the scrollView only scroll on horizontal direction make the constraint with scrollView s centerY   ContainerView s centerY  and to make it vertically scrollable make the scrollView s centerX   ContainerView s centerX

User · Answer

Add the UIScrollViewDelegate and adding the following code to the viewDidAppear method fixed it for me    interface testScrollViewController     lt UIScrollViewDelegate gt   - void viewDidAppear  BOOL animated       self scrollView delegate   self      self scrollView scrollEnabled   YES      self scrollView contentSize   CGSizeMake 375  800

User · Answer

If your scrollView is a subview of a containerView of some type  then make sure that your scrollView is within the frame or bounds of the containerView  I had containerView clipsToBounds   NO which still allowed me see the scrollView  but because scrollView wasn t within the bounds of containerView it wouldn t detect touch events   For example   containerView frame   CGRectMake 0  0  200  200   scrollView frame   CGRectMake 0  200  200  200    containerView addSubview scrollView   scrollView userInteractionEnabled   YES    You will be able to see the scrollView but it won t receive user interactions

User · Answer

Make sure you have the contentSize property of the scroll view set to the correct size  ie  one large enough to encompass all your content

User · Answer

Something that wasn t mentioned before   Make sure your outlet was correctly connected to the scrollView  It should have a filled circle  but even if you have filled circle  scrollView may not been connected - so double check  Hover over the circle and see if the actual scrollview gets highlighted   This was a case for me     Connect below well to the scrollView in the storyBoard  property  weak  nonatomic  IBOutlet UIScrollView  scrollView

User · Answer

if you are getting a message  IOS8   swift  that viewDidLayoutSubviews does not exist  use the following instead  override func viewDidAppear animated  Bool    This fixed it for me

User · Answer

It s always good to show a complete working code snippet      in viewDidLoad  if using Autolayout check note below    UIScrollView  myScrollView  UIView  contentView     scrollview won t scroll unless content size explicitly set   myScrollView addSubview contentView    if the contentView is not already inside your scrollview in your xib StoryBoard doc  myScrollView contentSize   contentView frame size    sets ScrollView content size   Swift 4 0  let myScrollView let contentView     scrollview won t scroll unless content size explicitly set  myScrollView addSubview contentView   if the contentView is not already inside your scrollview in your xib StoryBoard doc  myScrollView contentSize   contentView frame size   sets ScrollView content size   I have not found a way to set contentSize in IB  as of Xcode 5 0    Note  If you are using Autolayout the best place to put this code is inside the - void viewDidLayoutSubviews method

User · Answer

Set contentSize property of UIScrollview in ViewDidLayoutSubviews method  Something like this   override func viewDidLayoutSubviews         super viewDidLayoutSubviews        scrollView contentSize   CGSizeMake view frame size width  view frame size height

User · Answer

yet another fun case   scrollview superview userInteractionEnabled must be true  I wasted 2 hrs chasing this just to figure out the parent is UIImageView which  naturally  has userInteractionEnabled    false

User · Answer

In my case I had to set delaysContentTouches to true because the objects inside the scrollView were all capturing the touch events and handling themselves rather than letting the scrollView itself handle it

User · Answer

If you cannot scroll the view even after you set contentSize correctly  make sure you uncheck  Use AutoLayout  in Interface Builder -  File Inspector

User · Answer

The idea of why scroll view is not scrolling because you set the content size for scrolling less than the size of the scroll view  which is wrong  You should set the content size bigger than the size of your scroll view to navigate through it while scrolling   The same idea with zooming  you set the min and max value for zooming which will applied through zooming action   welcome

User · Answer

Uncheck  Use Autolayout  did the trick for me    Environment  xCode 5 0 2 Storyboards ios7

User · Answer

You need to set the contentSize property of the scroll view in order for it to scroll properly   If you re using autolayout  you need to set contentSize in viewDidLayoutSubviews in order for it to be applied after the autolayout completes   The code could look like this   - void viewDidLayoutSubviews          The scrollview needs to know the content size for it to work correctly     self scrollView contentSize   CGSizeMake          self scrollContent frame size width          self scrollContent frame size height   300

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Alot of the time the code is correct if you have followed a tutorial but what many beginners do not know is that the scrollView is NOT going to scroll normally through the simulator  It is suppose to scroll only when you press down on the mousepad and simultaneously scroll  Many Experienced XCode Swift Obj-C users are so use to doing this and so they do not know how it could possibly be overlooked by beginners  Ciao  -    IBOutlet weak var scrollView  UIScrollView  override func viewDidLoad         super viewDidLoad       view addSubview scrollView         Do any additional setup after the view    override func viewWillLayoutSubviews        super viewWillLayoutSubviews       scrollView contentSize   CGSize width  375  height  800      This code will work perfectly fine as long as you do what I said up above

User · Answer

I made it working at my first try  With auto layout and everything  no additional code  Then a collection view went banana  crashing at run time  I couldn t find what was wrong  so I deleted and recreated it  I am using Xcode 10 Beta 4  It felt like a bug  and then the scrolling was gone  The Collection view worked again  though   Many hours later   this is what fixed it for me  I had the following layout   UIView   Safe Area Scroll view   Content view    It s all in the constraints  Safe Area is automatically defined by the system  In the worst case remove all constraints for scroll and content views and do not have IB resetting creating them for you  Make them manually  it works    For Scroll view I did  Align Trailing Top to Safe Area  Equal Width Height to Safe area  For Content view I did  Align Trailing Leading Top Bottom to Superview  the scroll view    basically the concept is to have Content view fitting Scrollview  which is fitting Safe Area    But as such it didn t work  Content view missed the height  I tried all I could and the only one doing the trick has been a Content view height created control-dragging Content view   to itself  That defined a fixed height  which value has been computed from the Size of the the view controller  defined as freeform  longer than the real display  to containing all my subviews  and finally it worked again

User · Answer

One small addition  all above are the actual reasons why your scroll view might not be scrolling but sometimes mindlessly this could be the reason specially when scrollview is added through code and not IB  you might have added your subviews to the parent view and not to the scrollview this causes the subview to not scroll  and do keep the content size set and bigger than parent view frame  duhh

User · Answer

My issue was resolved by    setting the contentSize on the scrollView to a large height BUT also I had to fix top and or bottom constraints on views within the scrollView  which meant the scroll indicators showed on screen but the content did not scroll   Once I removed top and or bottom constraints bound to the safe area and or superview  the views inside the scrollView could scroll again and didn t stay fixed to the top of bottom of the screen   Hope this stops someone else from hours of pain with this particular issue

User · Answer

The answer above is correct - to make scrolling happen  it s necessary to set the content size    If you re using interface builder a neat way to do this is with user defined runtime attributes  Eg

User · Answer

adding the following code in viewDidLayoutSubviews worked for me with Autolayout  After trying all the answers   -  void viewDidLayoutSubviews       self activationScrollView contentSize   CGSizeMake IPHONE SCREEN WIDTH  620         set the height of content size as required

User · Answer

Try to resize the content size to huge numbers  I couldn t understand why my scroll view doesn t scroll even when its content size seems to be bigger than control size  I discovered that if the content size is smaller than needed  it doesn t work also    self scrollView contentSize   CGSizeMake 2000  2000     Instead of 2000 you can put your own big numbers  And if it works  it means that your content size is not big enough when you resize    The delegate is not necessary for scroll view to work

[ios] UIScrollView not scrolling

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