UIScrollView contentSize not working

Question

I put a UIScrollView in my nib\'s view, and linked it to a an IBOutlet property.

Now, when I do this in my viewDidLoad

Answer 1

Try this out...
add all constraints like you do for UIView (See screenShot of my ViewControler in Storyboard)

Now trick begins. select your last object and select its bottom constraint. (See above screenShot, Instagram button's Bottom Constraint(Yellow line)) and Change the Constant in Size Inspector like in bellow screenshot.

i require Constant=8 but you can change as per your requirements. this Constant is the Space between That Orange Button's Bottom and the scrollView.

EDIT

Make Sure about your view's hierarchy .

0) ViewController.view (optional)
1) UIScrollView
2) UIView (Rename as "contentView")
3) UIView (this view is your content that will make scrollView scroll)

Answer 2

I finally worked out my own solution to this problem because in my case I couldn't use the view controller's life cycle. Create your own scroll view subclass and use it instead of UIScrollView. This even worked for a scroll view inside a collection view cell.

 class MyScrollView:UIScrollView {

    var myContentSize:CGSize = CGSize.zero  // you must set this yourself 

    override func layoutSubviews() {
       super.layoutSubviews()
       contentSize = myContentSize
    }

 }

My MyScrollView was defined in the nib with a tag of 90. If so this is a good way to set content size in the code in the parent view.

let scrollView = viewWithTag(90) as! MyScrollView      
scrollView.myContentSize = ...

Answer 3

You can use this lines of code into your *.m file's

- (void)viewDidLoad{
   [scroll setContentSize:CGSizeMake(320, 800)]   ;
   [scroll setScrollEnabled:TRUE];
   [scroll setShowsVerticalScrollIndicator:NO];
   [scroll setShowsHorizontalScrollIndicator:YES];
}    

for this you need to take an IBOutlet property of UIScrollView into your *.h file this way:

IBOutlet UIScrollView *scroll;

And connect this from Storyboard.

Or,

You can use this method into your *.m file:

-(void)viewDidLayoutSubviews 
{
  [scroll setContentSize:CGSizeMake(320, self.view.frame.size.height* 1.5)];
   // this will pick height automatically from device's height and multiply it with 1.5  
}

This both solution works for me in xcode-5, xcode-6, xcode-6.1, xcode-6.2

Answer 4

The easiest/cleanest way is to set contentSize at viewDidAppear so you negate the effects of autolayout. This doesn't involve adding random views. However relying on load order for an implementation to work may not be the best idea.

Answer 5

There are two problems here. (1) viewDidLoad is too soon; you have to wait until after layout has taken place. (2) If you want to use autolayout with a scrollview that comes from a nib, then either you must use constraints to completely describe the size of the contentSize (and then you don't set the contentSize in code at all), or, if you want to set it in code, you must prevent the constraints on the scrollview's subviews from dictating the contentSize. It sounds like you would like to do the latter. To do so, you need a UIView that acts as the sole top-level subview of the scrollview, and in code you must set it to not use autolayout, enabling its autoresizingMask and removing its other external constraints. I show an example of how to do that, here:

https://github.com/mattneub/Programming-iOS-Book-Examples/blob/master/ch20p573scrollViewAutoLayout/ch20p573scrollViewAutoLayout/ViewController.m

But notice also the next example, which shows how to use constraints completely, instead of contentSize.

Answer 6

I tried viewWillLayoutSubviews to update scrollView's contentSize, it worked for me.

- (void)viewDidLayoutSubviews
{
  [self.bgScrollView setContentSize:CGSizeMake(320, self.view.frame.size.height* 1.5)];
}

Apple Doc

-(void)viewDidLayoutSubviews

Called to notify the view controller that its view has just laid out its subviews.

Discussion

When the bounds change for a view controller’s view, the view adjusts the positions of its subviews and then the system calls this method. However, this method being called does not indicate that the individual layouts of the view’s subviews have been adjusted. Each subview is responsible for adjusting its own layout.

Your view controller can override this method to make changes after the view lays out its subviews. The default implementation of this method does nothing.