How does a subview frame change if I transform the view frame?

I have to do t开发者_C百科his:

1:CGRect originalSubviewFrame = subview.frame;
2:view.frame = (CGRect)newFrame;
3:subview.frame = originalSubviewFrame;

I think instructions 1 and 3 shouldn't be there but if I don't restore the subview shape, it change for some reason!?!? I read the documentation but it's unclear.

If subview is a subview of view then whether it's frame changes when view's frame changed depends on whether view.autoresizesSubviews is YES and if so, how that manifests is determined by subview.autoresizingMask.

I encourage you to read the UIView documentation regarding those two properties.