ios - Image not shown on vertical-scrollView in a background horizontal-scrollView -

i show let's 3 long pictures (longer iphone's screen height) in big background uiscrollview horizontally, , since each picture longer screen height, put 3 sub-uiscrollview vertical swiping in background one.

i setup background 1 this:

_scrollview = [[uiscrollview alloc] initwithframe:cgrectmake(0, 0, screenwidth, screenheight)]; _scrollview.delegate = self; _scrollview.contentsize = cgsizemake(screenwidth*_count, screenheight); _scrollview.pagingenabled = yes; _scrollview.alwaysbouncevertical = no; _scrollview.alwaysbouncehorizontal = yes; 

and setup each sub-uiscrollview this:

if (imageheight > screenheight) { //requiring scrollview support     uiimageview *longimgview = [[uiimageview alloc] init];     [longimgview setframe:cgrectmake(originx, 0, screenwidth, imageheight)];     longimgview.image = _image;     uiscrollview *scrollview = [[uiscrollview alloc] initwithframe:cgrectmake(originx, 0, screenwidth, screenheight)];     [scrollview setcontentsize:cgsizemake(screenwidth, imageheight)];     [scrollview setcontentoffset:cgpointmake(originx, 0)];     scrollview.backgroundcolor = [uicolor bluecolor];     scrollview.alwaysbouncevertical = yes;     scrollview.alwaysbouncehorizontal = no;     [scrollview addsubview:longimgview];     [_scrollview addsubview:scrollview]; } 

please notice set scrollview.backgroundcolor = [uicolor bluecolor]; highlight sub-scrollview, when run it, can see blue-colored sub-scrollview, cannot see picture showing (longimgview.image = _image;).

update: can see memory address allocated _image break point , console. can see sub-scrollview has set same contentsize image size cannot see image itself.

wait: [longimgview setframe:cgrectmake(originx, 0, screenwidth, imageheight)];

make that:

[longimgview setframe:cgrectmake(0, 0, screenwidth, imageheight)];