Why won't basic UIScrollView with a few buttons scroll?

Why won't basic UIScrollView with a few buttons scroll?

So all I have done is:

• Create a view based iPhone app
• drag in a UIScrollView into the main controller xib file
• the scrollview now sits as a child of 开发者_开发百科View in IB
• in IB in scrollview increase it's view height up to 1000
• add some buttons to the scroll view (so they appear as children of the scroll view)
• did create the instance variable also, and property IBOutlet, synthesize
• linked in IB the File Owner scrollView outlet to the scroll view
• checked to ensure the scroll view in IB had the attribute "scrolling enabled" ticked

But still after all this in the iPhone simulator it won't let me scroll the view?

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Only one more thing you have to do: set the contentSize property on your scroll view to an appropriate value:

[scrollView setContentSize:CGSizeMake(
   scrollView.bounds.size.width,
   CGRectGetMaxY(bottommostSubview.frame)
)];

Where bottommostSubview is an outlet connected to the subview of the scrollview that’s closest to the bottom. You could also write a method to find this view automatically, or just hard-code a value if you know the size will never change.

The default contentSize is CGSizeZero which effectively disables scrolling.

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You probably don't want to change your scrollviews frame.size.height property to 1000.0, but your scrollviews contentSize.height.

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No, the correct answer is:

- (void)viewDidLayoutSubviews {
    [super viewDidLayoutSubviews];
    [self.scrollView setContentSize:CGSizeMake(320, 1700)];  
}

The original answer I founded on next link:

UIScrollView won't scroll (Storyboards) -> Find Evana's answer

I waste a lot of time trying implement scroll (and repeatedly). I have even used 2 views (UIScrollView and UIView inside the first)

It is not necessary!

THE KEY IS: viewDidLayoutSubviews

In the storyboard you implement UIScrollView as any other element,

but the key is setContentSize in method viewDidLayoutSubviews