iOS 10 Issue: Uiscrollview Not Scrolling, Even When Contentsize Is Set

iOS 10 Issue: UIScrollView Not Scrolling, Even When ContentSize Is Set

OK. I solved it.

I remove every single auto layout constraint for the internal (scrolled) view at build time.

I assume that iOS 10 is finally honoring the contract by forcing the top of the scrolled view to attach to the top of the scroller, even though the user wants to move it.

UIScrollView not scrolling regardless of large contentSize

Turning Auto Layout off works, but that's not the solution. If you really need Auto Layout, then use it, if you don't need it, turn it off. But that is not the correct fix for this solution.

UIScrollView works differently with other views in Auto Layout. Here is Apple's release note on Auto Layout, I've copied the interesting bit (emphasis mine, at third bullet point):

Here are some notes regarding Auto Layout support for UIScrollView:

• In general, Auto Layout considers the top, left, bottom, and right edges of a view to be the visible edges. That is, if you pin a view to
  the left edge of its superview, you’re really pinning it to the
  minimum x-value of the superview’s bounds. Changing the bounds origin
  of the superview does not change the position of the view.
• The UIScrollView class scrolls its content by changing the origin of its bounds. To make this work with Auto Layout, the top, left, bottom,
  and right edges within a scroll view now mean the edges of its content
  view.
• The constraints on the subviews of the scroll view must result in a size to fill, which is then interpreted as the content size of the
  scroll view. (This should not be confused with the
  intrinsicContentSize method used for Auto Layout.) To size the scroll
  view’s frame with Auto Layout, constraints must either be explicit
  regarding the width and height of the scroll view, or the edges of the
  scroll view must be tied to views outside of its subtree.
• Note that you can make a subview of the scroll view appear to float (not scroll) over the other scrolling content by creating constraints
  between the view and a view outside the scroll view’s subtree, such as
  the scroll view’s superview.

Apple then goes on to show example of how to correctly use UIScrollView with Auto Layout.

As a general rule, one of the easiest fix is to create a constraint between the element to the bottom of the UIScrollView. So in the element that you want to be at the bottom of the UIScrollView, create this bottom space constraint:

Once again, if you do not want to use Auto Layout, then turn it off. You can then set the contentSize the usual way. But what you should understand is that this is an intended behaviour of Auto Layout.

UIScrollView not scrolling

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 .

UIScrollView won't scroll even when I set content size

is userInteractionEnabled property equal to TRUE? Perhaps you have a subview over your scrollview that is stealing the touches?

UIScrollView Not Scrolling?

1. viewDidLoad is to soon. You must wait until after the layout of the views has taken place. Try setting the contentSize in viewDidAppear.

2. Are you using autolayout? If so, check out the following answer (and forget 1.):
   UIScrollView doesn't use autolayout constraints.

iOS - UIScrollView is not working (it doesn't scroll at all - the image stays fixed)

I just have done the same task..
Try this one.....

scrollView.delegate = self;
scrollView.scrollEnabled = YES;

int scrollWidth = 120;
scrollView.contentSize = CGSizeMake(scrollWidth,80);     

int xOffset = 0;
imageView.image = [UIImage imageNamed:[imagesName objectAtIndex:0]];

for(int index=0; index < [imagesName count]; index++)
{       
    UIImageView *img = [[UIImageView alloc] init];
    img.bounds = CGRectMake(10, 10, 50, 50);
    img.frame = CGRectMake(5+xOffset, 0, 50, 50);
    NSLog(@"image: %@",[imagesName objectAtIndex:index]);
    img.image = [UIImage imageNamed:[imagesName objectAtIndex:index]];
    [images insertObject:img atIndex:index];         
    scrollView.contentSize = CGSizeMake(scrollWidth+xOffset,110); 
    [scrollView addSubview:[images objectAtIndex:index]];

    xOffset += 70;
}

Also set this one....

imagesName = [[NSArray alloc]initWithObjects:@"image1.jpg",@"image2.jpg",@"image3.jpg",@"image4.jpg",@"image5.jpg",@"image6.png",@"image7.png",@"image9.png",nil];
    images = [[NSMutableArray alloc]init];

UIScrollView not scrolling although contentSize is smaller than UIImageView

That's because that your size of bounds of scroll view is larger than your content size.
The content size need to be the actual size of image view, and the visible size is set by frame / bounds. I guess you want to scroll a image in a {200, 200} sized rect?
Try this:

        UIScrollView * imgScrollView = [[UIScrollView alloc] initWithFrame:CGRectMake(0, 0, 200, 200)]; // this is your visible rect
        [imgScrollView setScrollEnabled:YES];
        [imgScrollView setClipsToBounds:YES];
        [imgScrollView addSubview:imgView];
        [imgScrollView setBackgroundColor:[UIColor yellowColor]];

        [imgScrollView setContentSize:imgFrame.size]; // this is your image view size

UIScrollView contentSize not working

I had the same problem. Auto Layout for UIScrollView is messed up.

Work around: Put everything in the UIScrollView into another UIView, and put that UIView as the only child of the UIScrollView. Then you can use Auto Layout.

If things near the end is messed up (the end of whichever direction your UIScrollView scrolls), change the constraint at the end to have the lowest possible priority.

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