UIView shadow drawing wrong

Trying to draw a shadow using code from this question: How do I draw a shadow under a UIView?

I implement it in a UIView subclass as discussed, but whe开发者_高级运维n I try and use it using UIView *shadow = [[ShadowView alloc]initWithFrame:CGRectMake(100,100,100,100)]; I get only a black square, rather than something resembling shadow.

Am I missing something here?

I know this an ancient question, but I came across it via google as I was trying to do the same thing. So I thought I would post incase anyone else has the same problem. I finally discovered a fix after reading this tutorial: http://www.raywenderlich.com/2134/core-graphics-101-glossy-buttons

You need to either uncheck Opaque, and set the Background to Clear Color in IB.

OR as shown in the tutorial set them in initWithCoder

-(id) initWithCoder:(NSCoder *)aDecoder {
    if ((self = [super initWithCoder:aDecoder])) {
        self.opaque = NO;
        self.backgroundColor = [UIColor clearColor];
    }
    return self;
}

Yup, you probably need to explicitly add an #import to the top of your class. I've had the same issue before and that fixed it. (Can't exactly explain why though)