iOS 3.x上的setShadowOffset崩溃

Question

由于未捕获的异常'NSInvalidArgumentException'而终止应用程序，原因：' * - [CALayer setShadowOffset：]：无法识别的选择器发送到实例0x2f86d0'

cell.shadowView.layer.masksToBounds = NO;
cell.shadowView.layer.cornerRadius = 10.0;
cell.shadowView.layer.shadowOffset = CGSizeMake(0, 2);
cell.shadowView.layer.shadowRadius = 6;
cell.shadowView.layer.shadowOpacity = 0.5;

Answer 1

阅读CALayer类参考所有内容都写在苹果的文档中。