ios - ViewController 通过 ViewController 的 View : I want a drop shadow on the left?

Question

我使用此代码向另一个 View 上方的 View 添加阴影。

CGRect rect = CGRectMake(90, 0, 230, 460);

FeedsViewController *feedsViewController = [[FeedsViewController alloc] init];
[feedsViewController.view setFrame:rect];
self.feedsViewController = feedsViewController;
[feedsViewController release];

[[feedsViewController.view layer] setShadowOffset:CGSizeMake(0, 1)];
[[feedsViewController.view layer] setShadowColor:[[UIColor darkGrayColor] CGColor]];
[[feedsViewController.view layer] setShadowRadius:3.0];
[[feedsViewController.view layer] setShadowOpacity:0.8];
[self.view.superview addSubview:feedsViewController.view];

但是不起作用，为什么？

Answer 1

我只是忘了

#import <QuartzCore/QuartzCore.h>

抱歉。