UIView - 如何在加载视图时收到通知？ [英] UIView - How to get notified when the view is loaded?

问题描述

对于 UIView viewDidLoad 的 UIViewController C $ C> ???
我需要在 UIView 加载（子类 UIView ）后立即通知我，并执行一些行动。

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.

推荐答案

根据您需要执行的操作类型，有以下几种方法：

Depending on what kind of actions you need to perform, there are several techniques:

1. - （id）initWithFrame：（CGRect）frame - UIView指定的
   初始值设定项;总是发送到UIView来初始化它，除非从笔尖加载
   视图;


2. - （id）initWithCoder：（NSCoder *）编码器 - 每当从笔尖加载视图时，总是发送初始化UIView;


3. - （void）awakeFromNib - 在nib中的所有对象初始化并连接后发送;仅在从笔尖加载对象时适用;你必须打电话给super;


4. - （void）willMoveToSuperview：（UIView *）newSuperview - 在视图添加为之前立即发送子视图到另一个视图;从超级视图中删除视图时， newSuperview 可能为零;


5. - （void）willMoveToWindow :( UIWindow *）newWindow - 在视图（或其超级视图）添加到窗口之前立即发送;从窗口中删除视图时， newWindow 可能为nil;


6. - （void）didMoveToSuperview - 在视图插入视图层次结构后立即发送;


7. - （void）didMoveToWindow - 立即发送在视图获取其窗口属性后设置。 -

1. -(id)initWithFrame:(CGRect)frame - UIView's designated initializer; always sent to a UIView to initialize it, unless the view is loaded from a nib;
2. -(id)initWithCoder:(NSCoder *)coder - always sent to initialize a UIView whenever the view is loaded from a nib;
3. -(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;
4. -(void)willMoveToSuperview:(UIView *)newSuperview - sent immediately before the view is added as a subview to another view; newSuperview may be nil when you remove the view from its superview;
5. -(void)willMoveToWindow:(UIWindow *)newWindow - sent immediately before the view (or its superview) is added to a window; newWindow may be nil when you remove the view from a window;
6. -(void)didMoveToSuperview - sent immediately after the view is inserted into a view hierarchy;
7. -(void)didMoveToWindow - sent immediately after the view gets its window property set. -

基本上，您可以选择在初始化期间执行操作（1& 2），从笔尖加载后（3） ，在插入视图层次结构（4& 5）之前和之后（6& 7）。

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).

这篇关于UIView - 如何在加载视图时收到通知？的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！