UIWindows class subviews method missing

Im just going through a video tutorial on swaping views.

see code below please:

NSArray *subs = [window subviews];

The "window subviews" code simply returns the views into the array subs.

But I checked the UIWindow class and I cannot find the property "subviews". Please help, no point my watching video tutorials if I dont understand the co开发者_运维百科de.

many thanks

UIWindow inherits from UIView. UIView has the subviews property.