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FRDynamicScrollView

This subclass of UIScrollView allows you to add subviews without having to worry about calculating their positions every time you do so.

You can also assign a top and bottom margin for you scrollView.

Sample Code

// The first view will have an automatic padding of 20px. You can change it if you want.
[scrollView insertView:view1];
[scrollView insertView:view2];
[scrollView insertView:view3 atIndex:2 topMargin:50];

scrollView.topMargin = 10;
scrollView.bottomMargin = 50;

[scrollView calculateViewsPosition];

See the sample code for details.