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 是否有类似于 UIViewController 的 viewDidLoad 的东西???我需要在 UIView 加载后立即收到通知(UIView 的子类)，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.

推荐答案

根据您需要执行的操作类型，有几种技巧:

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

1. -(id)initWithFrame:(CGRect)frame - UIView 的指定初始化程序；总是发送到 UIView 来初始化它，除非视图是从笔尖加载的；
2. -(id)initWithCoder:(NSCoder *)coder - 每当从笔尖加载视图时，总是发送以初始化 UIView；
3. -(void)awakeFromNib - 在nib中的所有对象初始化并连接后发送；仅当您从笔尖加载对象时才适用；你必须打电话给超级；
4. -(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 从其父视图中删除视图时可能为零；
5. -(void)willMoveToWindow:(UIWindow *)newWindow - 在视图(或其父视图)添加到窗口之前立即发送；newWindow 从窗口中移除视图时可能为零；
6. -(void)didMoveToSuperview - 在视图插入视图层次结构后立即发送；
7. -(void)didMoveToWindow - 在视图设置其窗口属性后立即发送.-

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 (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).

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！