ios - UIImage+ImageEffects doesn't work on device -

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i have modal view want present results of calculation. in order make ios7 look, want tinted background popup view blured background.

i managed got thing work using files "uiimage+imageeffects .h/m" apple.

this viewdidload of modal view:

- (void)viewdidload {      [super viewdidload];      /* how works       self.image screenshot of vc presenting modal view       1- set background screenshot of previous viewcontroler      2- hide popup view      3- set background of popup blured snapshot of container view    (self.view)      4- unhide popup view , set radius      5- create tinted version of background image (what got previous view controller      6- set background of self.view tinted version        */      // ***  1  ***      self.view.backgroundcolor=[uicolor colorwithpatternimage:self.image];        // ***  2  ***      self.containerview.hidden=yes;       // ***  3  ***      uiimage *pepe=[self bluredimagefromview:self.containerview withbackground:self.view withbackgroundtintcolor:[uicolor colorwithwhite:1 alpha:0.75]];     self.containerview.backgroundcolor=[uicolor colorwithpatternimage:pepe];      // ***  4  ***      self.containerview.hidden=no;     self.containerview.layer.cornerradius=4.5f;      // ***  5  ***      uiimage *tintedbackground =[self.image applyblurwithradius:0                                                       tintcolor:[uicolor colorwithred:0.85 green:0.85 blue:0.85 alpha:0.35]                                           saturationdeltafactor:1.8                                                       maskimage:nil];     // ***  6  ***      self.view.backgroundcolor=[uicolor colorwithpatternimage:tintedbackground];   }

it works on simulators when tried onmy iphone (4s), when modal view presented, i've got black screen. no errors, no complaining console, no nothing.

any thoughts?

edit

i add code:

if (!self.image) nslog (@"self.image empty");

at beginning of viewdidload

it seems on simulator self.image not nil whereas on device is. i've tried instantiate self.image prepareforsegue on parent vc doesn't work.

i don't know how bluredimagefromview working, there security(sandbox) differences between simulator , actual ios device (particularly resizablesnapshotviewfromrect: , drawviewhierarchyinrect:) might explain why works (but doesn't on device.)
check out thread @ raywenderlich.com got advice apple developer tech support. example code apparently apple. 

- (ibaction)doblurandcrop:(id)sender {  uiimage *snapshotimage;      /* draw image of views below our view */ uigraphicsbeginimagecontextwithoptions(self.sourceimageview.bounds.size, no, 0); bool successfuldrawhierarchy = [self.sourceimageview drawviewhierarchyinrect:self.sourceimageview.bounds afterscreenupdates:yes]; if ( successfuldrawhierarchy ) {     snapshotimage = uigraphicsgetimagefromcurrentimagecontext(); } else {     nslog(@"drawviewhierarchyinrect:afterscreenupdates: failed - there's nothing draw..."); } uigraphicsendimagecontext();  if ( successfuldrawhierarchy ) {          /* calculate coordinates of rectangle we're interested in within returned image */     cgrect croprect = cgrectoffset(self.targetimageview.frame, - self.sourceimageview.frame.origin.x, - self.sourceimageview.frame.origin.y);          /* draw cropped section clipping region */     uigraphicsbeginimagecontextwithoptions(croprect.size, yes, 0);     cgcontextref context = uigraphicsgetcurrentcontext();     cgcontextcliptorect(context, cgrectmake(0, 0, croprect.size.width, croprect.size.height));     cgrect targetrectangeforcrop = cgrectmake(-croprect.origin.x, -croprect.origin.y, snapshotimage.size.width, snapshotimage.size.height);     [snapshotimage drawinrect:targetrectangeforcrop];     uiimage *croppedsnapshotimage = uigraphicsgetimagefromcurrentimagecontext();     uigraphicsendimagecontext();          /* apply special effect resulting image , copy place on screen */     uicolor *tintcolor = [uicolor colorwithwhite:1.0 alpha:0.3];     self.targetimageview.image = [croppedsnapshotimage applyblurwithradius:5 tintcolor:tintcolor saturationdeltafactor:1.8 maskimage:nil]; } }

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