How to blend multiple UIView in iOS?

I want to blend multiple UIView in such a way that it can move, rotate and resize smoothly.

I already achieved this with the code below but it's not as smooth as other application like PicsArt & SnapSeed.

- (void)drawRect:(CGRect)rect {
   // Drawing code

   [super drawRect:rect];

   UIImage *viewImage = [self captureView:self.superview withFrame:self.frame];

   [viewImage drawInRect:rect];

   [self.imageToBlend drawInRect:rect blendMode:self.blendMode alpha:self.alphaBlend];

  // Other code....  
}

from How to blend multiple UIView in iOS?