ios - Center UILabel after scrolling down -


i have problem centering label in scrollview. need user input 1 tab , based on data show results in tab. have set label tell user insert data if user taps tab without having inserted data first. works fine when user hasn't inserted data , presses results tab. looks this:

centered label http://i39.tinypic.com/2je2ruu.png

the problem appears when user has inserted data, scrolls way down, goes first tab, clears data , presses results tab again. label doesn't stay centered anymore:

noncentered label http://i44.tinypic.com/35kli75.png

i'm using auto layout mixed approach, have scrollview contentview inside that. when label displayed (i.e no data inserted) don't want view scroll, i'm doing this:

-(void)resultstabclicked {  if(dataisinserted) { mylabel.hidden = yes; self.contentviewheight.constant = resultsviewheight; self.scrollview.contentsize = cgsizemake(320, resultsviewheight); }  else { mylabel.hidden = no; self.contentviewheight.constant = 411; self.scrollview.contentsize = cgsizemake(320, 411); } }

it works because when label in wrong place , first tab pressed , user still doesn't insert data , presses second tab again, voila! label in right place.

i'm experiencing same when there results displayed. depending on data result view height changes , again, when user scrolls down, goes first tab, changes data , goes results tab , results view happens smaller previous results view, top of result view cut off. , when user goes first tab, doesn't change , goes results tab, perfect again. have suggestions how make layout perfect first time view updated?


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