UIView.window属性来源于当前UIApplication.keyWindow,可以通过此属性让UIView间接获取到该视图的UIViewController类。
不一定是。
可通过view.window.keyWindow判断。
万一view是键盘上的某一块,view.window就是键盘的window。
self.view.window 只是当前view的window,可能是keywindow @property(nonatomic, readonly) UIWindow *window Description The receiver’s window object, or nil if it has none. (read-only) This property is nil if the view has not yet been added to a window.
[[UIApplication sharedApplication] keyWindow] @property(nonatomic, readonly) UIWindow *keyWindow This property holds the UIWindow object in the windows array that is most recently sent the makeKeyAndVisible message.
[[UIApplication sharedApplication] windows] @property(nonatomic, readonly) NSArray *windows This property returns an array of the application's visible and hidden windows. The windows are ordered back to front.
我觉得UIView.window返回的是当前view所在的那个window,未必是keywindow