Remove background of UIVIew - Remove The rectangle like shape - ios

Question

I have a UIView in which i want to remove the whole background so it would take the shape of a paper. I tried setting the background to transparent from the UI and using the code but i always end up with a gray-like semi transparent background no matter what i do. Here is the current output i am getting :
How can i remove that grey background? i need it to display as a whole paper without that residue. Any Help? I tried the following :
// self.view.backgroundColor = [UIColor clearColor];
//
// [self.view setOpaque:YES];
//
// self.view.backgroundColor = [UIColor clearColor];.
// self.view.layer.borderWidth = 0.0;
// self.view.layer.masksToBounds = YES;
// self.view.backgroundColor=[[UIColor clearColor] colorWithAlphaComponent:.0];
And the current UI Configuration is :
How can i manage to remove it !? Any help!?
EDIT 1
This is the new output

Answer 1

Looks like your image it's inside a Modal View. If that is the case try the following:
Set the self.view.superview.backgroundColor to [UIColor clearColor]; inside the viewWillLayoutSubviews
Example
- (void)viewWillLayoutSubviews
{
[super viewWillLayoutSubviews];
self.view.superview.layer.masksToBounds = YES;
self.view.superview.backgroundColor = [UIColor clearColor];
}