UIView - 加载视图时如何收到通知？
对于 UIView 来说，是否有类似于 UIViewController 的 viewDidLoad 的东西？？？ 我需要在 UIView 加载（UIView 的子类）后立即收到通知，并执行一些操作。
Is there anything similar to the viewDidLoad of UIViewController for a UIView???
I need to be notified as soon as a UIView has loaded (Subclass of UIView), and perform some actions.
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根据您需要执行的操作类型，有几种技术：
-(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；你必须调用 super；-(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；当您从其超级视图中删除视图时，newSuperview可能为零；-(void)willMoveToWindow:(UIWindow *)newWindow- 在视图（或其超级视图）添加到窗口之前立即发送；当您从窗口中删除视图时，newWindow可能为零；-(void)didMoveToSuperview- 在视图插入视图层次结构后立即发送；-(void)didMoveToWindow- 在视图获取其窗口属性设置后立即发送。 -基本上，您可以选择在初始化期间（1 和 2）、从笔尖加载之后（3）、插入视图层次结构之前（4 和 5）以及之后（6 和 7）执行操作。
Depending on what kind of actions you need to perform, there are several techniques:
-(id)initWithFrame:(CGRect)frame- UIView's designatedinitializer; 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. -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).