ios - Cannot get correct UIScrollView height from its subviews -

this question has answer here:

• uiscrollview bounds have not yet resized in “viewdidload” 2 answers

inside viewdidload of uiviewcontroller create:

a uiscrollview following code:

- (void)generatescrollview {      _scrollview = [[uiscrollview alloc] initwithframe:_containerview.frame];     [_containerview addsubview:_scrollview];      [self generatecontentview];  } 

where _containerview uiview created through interface builder following constraints:

then generate uiview i'll use container ui elements:

- (void)generatecontentview {      _contentview = [[uiview alloc] initwithframe:_scrollview.frame];      [_scrollview addsubview:_contentview];  } 

then generate n ui elements (uitextview, uiimageview ecc..) , recalculate height of both contentview , scrollview following code:

- (void)recalculatescrollviewheight {      cgrect contentrect = cgrectzero;     (uiview *view in _contentview.subviews) {         contentrect = cgrectunion(contentrect, view.frame);          nslog(@"contentrect height: %f", contentrect.size.height);     }      _contentview.frame = cgrectmake(_contentview.frame.origin.x, _contentview.frame.origin.y, _contentview.frame.size.width, contentrect.size.height + [[uiapplication sharedapplication] statusbarframe].size.height + self.navigationcontroller.navigationbar.frame.size.height);      nslog(@"_contentview height: %f", _contentview.frame.size.height);      _scrollview.contentsize = _contentview.frame.size;  } 

the problem _scrollview cuts of content because seems calculated height not correct. i'm struggling problem , can't seem find solution, know why calculated height it's not correct? missing property uiscrollview or uiview?

edit: result of 2 nslog:

contentrect height: 180.000000

contentrect height: 360.000000

contentrect height: 540.000000

_contentview height: 604.000000

i've added 3 uiimageview height of 180 result correct, 540 + 20 (status bar height) + 44 (navigation bar height), still scrollview cuts pixels last image. there's no spacing between images, they're 1 after another

i've seen cases uiscrollview try , helpful offsetting in order incorporate navigation bar if it's hidden. have tried disabling property?

self.automaticallyadjustsscrollviewinsets 

i assume have scrollenabled set yes? bit of shot in dark, noticed others resolving similar issues here disabling , re-enabling scrolling:

large text being cut off in uitextview inside uiscrollview