UIViewController.View.Window 在 ViewDidLoad 方法中为 null [英] UIViewController.View.Window is null in ViewDidLoad method
问题描述
无论是哪种控制器类型(UIViewController
、UITableViewController
),以下行总是在 ViewDidLoad
中产生 null
> 方法:
Regardless on which controller type (UIViewController
, UITableViewController
), the following line always yields null
in the ViewDidLoad
method:
this.View.Window
这种行为是否正常,还是我在做一些奇怪的事情?什么会导致 UIViewController.View.Window
成为 null
?
Is this behavior normal, or am I doing something odd? What could lead to UIViewController.View.Window
being null
?
(我想这个问题不仅涉及 MonoTouch,还涉及正常的"Objective-C Cocoa).
(I suppose this question concerns not only MonoTouch, but also 'normal' Objective-C Cocoa).
(MonoTouch 5.2.11, Xcode 4.2.1 4D502)
(MonoTouch 5.2.11, Xcode 4.2.1 4D502)
推荐答案
根据UIView,如果视图没有,window
属性为 nil
尚未添加到窗口中,这是调用 viewDidLoad
时的情况.
According to the documentation of UIView, the window
property is nil
if the view has not yet been added to a window which is the case when viewDidLoad
is called.
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