render - iOS: rendering a subview at the proper resolution -

i have view has few subviews. using transforms scale view 400%, works perfectly, not sure how scale "drawing" of sub-views. when render scaled view subviews come out fuzzy because drawing still @ 100%.

i have tried [view setneedsdisplay] on view , subviews, drawing still low resolution.

any ideas on how fix render?

try:

cgfloat myscale = 4.0; [view setcontentscalefactor:myscale*[[uiscreen mainscreen] scale]]]; 

additionally, if embedding view within uiscrollview allow user zoom in/out put implementation in uiscrollviewdelegate:

- (void)scrollviewdidendzooming:(uiscrollview *)scrollview withview:(uiview *)view atscale:(float)scale {     scale *= [[[scrollview window] screen] scale];     [view setcontentscalefactor:scale]; }