ios - CALayer Troubles when loading an image from a UIImagePicker -

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i have uiviewcontroller uiimageview (imageview), , i'm defining several layers nested in imageview follows in viewdidload: 

//container layer - top layer calayer *containerlayer = [calayer layer]; containerlayer.opacity = 0; containerlayer.bounds = [self.imageview.layer frame];  // holder layer calayer *holderlayer = [calayer layer]; holderlayer.opacity = 0; holderlayer.bounds = self.imageview.bounds;  // hierarchy layers [containerlayer setvalue:holderlayer forkey:@"__holderlayer"]; [containerlayer addsublayer:holderlayer];  [self.imageview.layer addsublayer:containerlayer];

i have following code works when loading image uiimagepicker :

    uiimage *image = [info objectforkey:uiimagepickercontrolleroriginalimage];     uiimageview *newimgview = [[uiimageview alloc] initwithframe:self.imageview.frame];      cgrect frame = self.imageview.frame;      newimgview.image = image;     frame.origin = cgpointmake(0, 0);     newimgview.layer.frame = frame;     newimgview.layer.opacity = .9;     newimgview.layer.contentsgravity = kcagravityresizeaspectfill;      calayer * containerlayer = self.imageview.layer.sublayers[0];      if (containerlayer != nil)     {          [containerlayer setvalue:newimgview.layer forkey:@"__imagelayer"];           calayer * holderlayer = [containerlayer valueforkey:@"__holderlayer"];         if (holderlayer != nil)         {             //!!!!!line below doesn't work!!!             //[holderlayer addsublayer:newimgview.layer];              //line below works!             [self.imageview.layer addsublayer:newimgview.layer];         }        }     [self.imageview setneedsdisplay];     [self checkandprintlayers];

so first nested layer containerlayer, holderlayer, , i'm expecting add various images sublayers holderlayer , manipulate it. however, calling 

  [holderlayer addsublayer:newimgview.layer];

doesn't work; imageview stays blank. however, calling 

[self.imageview.layer addsublayer:newimgview.layer];

and adding sublayer top layer works dandy. missing obvious here? love suggestions. thanks.

because

holderlayer , containerlayer transparent (holderlayer.opacity = 0 / containerlayer.opacity = 0),

make it,

 //container layer - top layer calayer *containerlayer = [calayer layer]; containerlayer.opacity = 1.0; containerlayer.bounds = [self.imageview.layer frame];  // holder layer calayer *holderlayer = [calayer layer]; holderlayer.opacity = 1.0; holderlayer.bounds = self.imageview.bounds;

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