用UIBezierPath给view增添阴影
用UIBezierPath给view添加阴影
bgForListView.layer.shadowOffset = CGSizeZero;
bgForListView.layer.shadowRadius = 10.0f;
bgForListView.layer.shadowOpacity = 1.0f;
bgForListView.layer.shadowPath = [UIBezierPath bezierPathWithRect:bgForListView.bounds].CGPath;