Line is not smooth on layer.border when its rotated

Question

I need to rotate an UIImageView:

UIImageView *img = [[UIImageView alloc] init];
img.layer.borderWidth = 3.0;
img.layer.borderColor = UIColorFromRGB(0xffffff).CGColor;
img.layer.shadowColor = UIColorFromRGB(0x000000).CGColor;
CATransform3D transform = CATransform3DMakeRotation ([Helper degreesToRadians:(5)], 1, 1, 1);
img.layer.shadowRadius  = 2.0;
img.layer.shouldRasterize = YES;

The problem is that the border is not smooth at all:

Answer 1

Try adding a transparent border (1px may be) around your image. See this link. Check UIImage+Alpha section in that page.