myLayer.shadowRadius = 3;
    //shadowBlurRadius
    myLayer.shadowColor = [[UIColor greenColor] CGColor];
    //intended is to get a green solid shadow without blur

myLayer.shadowColor = [[UIColor greenColor] CGColor];
myLayer.shadowOffset = CGSizeMake(5.0,5.0);
myLayer.shadowOpacity = 1.0;
myLayer.shadowRadius = 0.0;