Here, we will add blue shadow to a UILabel:

    UILabel *myLabel = [[UILabel alloc] init];
    UIColor *color = [UIColor blueColor];

    myLabel.layer.shadowColor = [color CGColor];
    myLabel.layer.shadowRadius = 5.0f;
    myLabel.layer.shadowOpacity = 1;
    myLabel.layer.shadowOffset = CGSizeZero;

    myLabel.layer.masksToBounds = NO;