常用

//阴影
    [self.shadowView.layer setShadowOffset:CGSizeMake(0, 0)];
    [self.shadowView.layer setShadowColor:[UIColor blackColor].CGColor];
    [self.shadowView.layer setShadowOpacity:0.5];
    [self.shadowView.layer setBorderColor:[UIColor whiteColor].CGColor];
    [self.shadowView.layer setMasksToBounds:NO];