iphone: uiscrollview doesn't scroll? but contentsize is set..?

Question

hey people, I have some data and want to show this in a new view inside a navigation-stack.

I created some new viewcontroller class with XIB file. Then I edited the XIB file and placed the following hierachy:

1 files owner
2 first responder
3 scrollview
3.1 view
3.1.1 label1
3.1.2 label2
3.1.3 label3
3.1.4 image4

I arranged the labels and the image. the content of the labels may differ and they should size dynamically. I also did the IBOutlets in the viewcontroller class and connected everything correctly. the files owner's view delegate is set to view..

then I load the viewcontroller and I do in the "viewDidLoad" - method the following:

- (void)viewDidLoad {
[super viewDidLoad];

self.currentPageURL.text = [self.offerItem objectForKey: @"page-url"];
self.currentPrice.text = [self.offerItem objectForKey: @"price"];
self.currentRank.text = [self.offerItem objectForKey: @"rank"];
self.currentName.text = [self.offerItem objectForKey: @"name"];
self.currentProducerName.text = [self.offerItem objectForKey: @"producer-name"];

self.currentDescription.text = [self.offerItem objectForKey: @"description"];

self.imageViewForImage.image = [helperClass resizeImage:[self.offerItem objectForKey: @"picture"] forSize:CGSizeMake(280.0, 280.0) ];

[theScrollview setScrollEnabled:YES];
[theScrollview setContentSize:CGSizeMake(320, 1200)];
[theScrollview flashScrollIndicators];

[theScrollview addSubview:theView];

}

when I start the app in my simulator, everything is shown, but if I try to scroll, nothing happens..

what do I do wrong?

Answer 1

Autolayout set some constraints after the view loads, so, pick your code that sets the content size in viewDidLoad and put in viewDidAppear, and your code won't be rewritten.

This worked for me.

-(void)viewDidAppear:(BOOL)animated{
  [self.scrollView setContentSize:CGSizeMake(320, 1000)];
}

and sorry for my poor english.

Answer 2

Ensure that "Use Autolayout" is unchecked in the IB Document attributes. I had the exact same issue, setting the correct contentSize and all, but with this feature enabled, scrolling was always disabled.

UPDATE To use Autolayout, explicitly set the width and height of the scrollView's content in the viewDidAppear method, like this:

- (void)viewDidAppear:(BOOL)animated
{
    [super viewDidAppear:animated];

    // set the scrollview to the specified size
    CGRect screenRect = [[UIScreen mainScreen] bounds];
    [scrollView setContentSize:CGSizeMake(screenRect.size.width, 1100)];

    [scrollView setBounds:CGRectMake(0, 0, screenRect.size.width, screenRect.size.height)];

    [scrollView setScrollIndicatorInsets:UIEdgeInsetsFromString(@"{0,0,0,-1.0}")];

}

Answer 3

Immediately change the frame of theScrollView to 320x480 and you should see scrolling.