ios 给UIImageView添加阴影

_borderView.layer.shadowColor = [UIColor grayColor].CGColor;

_borderView.layer.shadowOffset = CGSizeZero; _borderView.layer.shadowOpacity = 1.0;

_borderView.layer.shadowRadius = 2;

_borderView.backgroundColor = [UIColor whiteColor];

_borderView.clipsToBounds = NO;