iphone - setContentOffset on UIScrollView the right way -

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i'm using code scroll uiscrollview down because i'm adding new uiview on bottom , want scroll down it. this:

cgpoint newoffset = cgpointmake(mainscrollview.contentoffset.x, mainscrollview.contentoffset.y + floorf(bottomattachmentview.frame.size.height / bottomattachmentview.multfactor)); [mainscrollview setcontentoffset:newoffset animated:yes];

i add new element's height y of uiscrollview's contentoffset scrolls out of scrollview contentsize, lower, possible scroll. happens because modify contentsize before calling method above , height of scroll view shrinks.

how call setcontentoffset wouldn't make scrollview scroll out of it's own contentsize? thanks!

all had actually, scroll uiscrollview bottom this:

cgpoint bottomoffset = cgpointmake(0, [mainscrollview contentsize].height - mainscrollview.frame.size.height); [mainscrollview setcontentoffset:bottomoffset animated:yes];

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