Objective-C 类型的向下转型

Question

我正在尝试覆盖

- (void)makeWindowControllers;

这是它的代码:

NSStoryboard* const storyboard = [NSStoryboard storyboardWithName:@"Main" bundle:nil];
NSWindowController* const windowController = [storyboard instantiateControllerWithIdentifier:@"Document Window Controller"];

然后我想将图像添加到 ViewController 用户通过 open... 在 Swift 中选择的图像我会简单地做:

(windowController.contentViewController as? ViewController)?.imageView?.image = openedImage

我如何在 Objective-C 中进行这种向下转换？我真的很困惑，因为我在学习 C 时没有做过太多类型转换。谢谢。

Answer 1

[[((ViewController *)[windowController contentViewController]) imageView] setImage: openedImage];