ios UIView - 如何在加载视图时收到通知？
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UIView - How to get notified when the view is loaded?
提问by aryaxt
Is there anything similar to the viewDidLoadof UIViewControllerfor a UIView???
I need to be notified as soon as a UIViewhas loaded (Subclass of UIView), and perform some actions.
有什么类似viewDidLoad的UIViewController了UIView??? 我需要在UIView加载（ 的子类UIView）后立即收到通知，并执行一些操作。
回答by Costique
Depending on what kind of actions you need to perform, there are several techniques:
根据您需要执行的操作类型，有几种技术：
-(id)initWithFrame:(CGRect)frame- UIView's designated initializer; always sent to a UIView to initialize it, unless the view is loaded from a nib;-(id)initWithCoder:(NSCoder *)coder- always sent to initialize a UIView whenever the view is loaded from a nib;-(void)awakeFromNib- sent after all the objects in the nib are initialized and connected; applicable only if you load the object from a nib; you must call super;-(void)willMoveToSuperview:(UIView *)newSuperview- sent immediately before the view is added as a subview to another view;newSuperviewmay be nil when you remove the view from its superview;-(void)willMoveToWindow:(UIWindow *)newWindow- sent immediately before the view (or its superview) is added to a window;newWindowmay be nil when you remove the view from a window;-(void)didMoveToSuperview- sent immediately after the view is inserted into a view hierarchy;-(void)didMoveToWindow- sent immediately after the view gets its window property set. -
-(id)initWithFrame:(CGRect)frame- UIView 的指定初始化器；总是发送到 UIView 来初始化它，除非视图是从笔尖加载的；-(id)initWithCoder:(NSCoder *)coder- 每当从笔尖加载视图时，总是发送以初始化 UIView；-(void)awakeFromNib- 在nib中的所有对象初始化并连接后发送；仅当您从笔尖加载对象时才适用；你必须打电话给超级；-(void)willMoveToSuperview:(UIView *)newSuperview- 在视图作为子视图添加到另一个视图之前立即发送；newSuperview当您从其超级视图中删除视图时可能为零；-(void)willMoveToWindow:(UIWindow *)newWindow- 在视图（或其父视图）添加到窗口之前立即发送；newWindow当您从窗口中移除视图时可能为零；-(void)didMoveToSuperview- 在视图插入视图层次结构后立即发送；-(void)didMoveToWindow- 在视图设置其窗口属性后立即发送。——
Basically, you can choose to perform your actions during initialization (1 & 2), after loading from a nib (3), before insertion into a view hierarchy (4 & 5) and after that (6 & 7).
基本上，您可以选择在初始化期间 (1 & 2)、从笔尖加载之后 (3)、插入视图层次结构之前 (4 & 5) 以及之后 (6 & 7) 执行您的操作。
