blocks|key|1621285|text|loadView是UIViewController中的方法，它将实际加载视图并将其分配给view属性。如果要以编程方式设置view属性，这也是UIViewController的子类将重写的位置。|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|1621286|viewDidLoad是加载视图后调用的方法。这是在调用loadView之后调用的。在这个位置，您可以覆盖和插入代码，以便在加载视图后对其进行进一步的初始设置。|1621287|entityMap^0|0|8|9|G|18|4|1P|4|1Z|G|0|0|B|0^^$0|@$1|2|3|4|5|6|7|J|8|@$9|K|A|L|B|C]|$9|M|A|N|B|C]|$9|O|A|P|B|C]|$9|Q|A|R|B|C]|$9|S|A|T|B|C]]|D|@]|E|$]]|$1|F|3|G|5|6|7|U|8|@$9|V|A|W|B|C]]|D|@]|E|$]]|$1|H|3|-4|5|6|7|X|8|@]|D|@]|E|$]]]|I|$]]

<code>loadView</code> is the method in <code>UIViewController</code> that will actually load up the view and assign it to the <code>view</code> property. This is also the location that a subclass of <code>UIViewController</code> would override if you wanted to programatically set up the <code>view</code> property.

<code>viewDidLoad</code> is the method that is called once the view has been loaded. This is called after loadView is called. It is a place where you can override and insert code that does further initial setup of the view once it has been loaded.

blocks|key|1406556|text|只需添加一些代码示例来演示NilObject所说的内容：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1406557|-+(void)loadView
{
++++//+create+and+configure+the+table+view
++++myTableView+=+[[UITableView+alloc]+initWithFrame:[[UIScreen+mainScreen]+applicationFrame]+style:UITableViewStyleGrouped];+++
++++myTableView.delegate+=+self;
++++myTableView.dataSource+=+self;
++++myTableView.scrollEnabled+=+NO;
++++self.view+=+myTableView;

++++self.view.autoresizesSubviews+=+YES;
}

-+(void)viewDidLoad+
{
++self.title+=+@"Create+group";

++//+Right+menu+bar+button+is+to+Save
++UIBarButtonItem+*saveButtonItem+=+[[UIBarButtonItem+alloc]+initWithTitle:@"Save"+style:UIBarButtonItemStyleDone+target:self+action:@selector(save)];
++self.navigationItem.rightBarButtonItem+=+saveButtonItem;
++[saveButtonItem+release];
}|code-block|syntax|javascript|1406558|entityMap^0|0|0^^$0|@$1|2|3|4|5|6|7|I|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|J|8|@]|9|@]|A|$E|F]]|$1|G|3|-4|5|6|7|K|8|@]|9|@]|A|$]]]|H|$]]

Just adding some code examples to demonstrate what NilObject said:

<pre><code>- (void)loadView
{
 // create and configure the table view
 myTableView = [[UITableView alloc] initWithFrame:[[UIScreen mainScreen] applicationFrame] style:UITableViewStyleGrouped]; 
 myTableView.delegate = self;
 myTableView.dataSource = self;
 myTableView.scrollEnabled = NO;
 self.view = myTableView;

 self.view.autoresizesSubviews = YES;
}

- (void)viewDidLoad 
{
 self.title = @"Create group";

 // Right menu bar button is to Save
 UIBarButtonItem *saveButtonItem = [[UIBarButtonItem alloc] initWithTitle:@"Save" style:UIBarButtonItemStyleDone target:self action:@selector(save)];
 self.navigationItem.rightBarButtonItem = saveButtonItem;
 [saveButtonItem release];
}
</code></pre>

blocks|key|1621430|text|要防止在读取self.view时发生无限循环，请在加载视图时调用该类的超级实现。超级实现将为您分配一个新的UIView。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1621431|-+(void)+loadView+{
[super+loadview];

//+init+code+here...

[self.view+addSubView:mySubview1];+//etc..

}|code-block|syntax|javascript|1621432|entityMap^0|0|0^^$0|@$1|2|3|4|5|6|7|I|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|J|8|@]|9|@]|A|$E|F]]|$1|G|3|-4|5|6|7|K|8|@]|9|@]|A|$]]]|H|$]]

To prevent an infinite loop from happening when you read self.view, call the class' super implementation when you load a view. The super implementation will allocate a new UIView for you.

<pre><code>- (void) loadView {
[super loadview];

// init code here...

[self.view addSubView:mySubview1]; //etc..

}
</code></pre>

blocks|key|1621488|text|使用loadView最简单的方法是制作某种类型的基本视图控制器，比如MyBaseViewController，它是UIViewController的子类。在它的loadView方法中，以这种方式创建视图：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1621489|-(void)+loadView+{
++++if+([self+viewFromNib])+{
++++++++self.view+=+[self+viewFromNib];
++++}+else+{
++++++++self.view+=+[[[UIView+alloc]+initWithFrame:[[UIScreen+mainScreen]+bounds]]+autorelease];
++++}
++++self.view.autoresizingMask+=+UIViewAutoresizingFlexibleHeight;
++++self.view.backgroundColor+=+[UIColor+whiteColor];
}|code-block|syntax|javascript|1621490|当你需要做一些视图控制器时，你只需要使用MyBaseViewController的子类，在它的loadView控制器中，你只需要像这样调用超级loadView|1621491|//sucblass+loadView
-(void)+loadView+{
++++[super+loadView];

++++//rest+of+code+like+this..
++++UILabel+*myLabel+=+[[UILabel+alloc]+initWithFrame:myFrame];
++++[self.view+addSubview:myLabel];
++++[myLabel+release];
}|1621492|entityMap^0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|M|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|N|8|@]|9|@]|A|$E|F]]|$1|G|3|H|5|6|7|O|8|@]|9|@]|A|$]]|$1|I|3|J|5|D|7|P|8|@]|9|@]|A|$E|F]]|$1|K|3|-4|5|6|7|Q|8|@]|9|@]|A|$]]]|L|$]]

The easiest way to use loadView is to make some type of base view controller, like MyBaseViewController which is subclass of UIViewController. In it's loadView method create view in this way:

<pre><code>-(void) loadView {
 if ([self viewFromNib]) {
 self.view = [self viewFromNib];
 } else {
 self.view = [[[UIView alloc] initWithFrame:[[UIScreen mainScreen] bounds]] autorelease];
 }
 self.view.autoresizingMask = UIViewAutoresizingFlexibleHeight;
 self.view.backgroundColor = [UIColor whiteColor];
}
</code></pre>

And when you need to make some view controller you just use subclass of MyBaseViewController and in it's loadView controller you just call [super loadView] like this

<pre><code>//sucblass loadView
-(void) loadView {
 [super loadView];

 //rest of code like this..
 UILabel *myLabel = [[UILabel alloc] initWithFrame:myFrame];
 [self.view addSubview:myLabel];
 [myLabel release];
}
</code></pre>

blocks|key|1406712|text|viewDidLoad()|type|code-block|depth|inlineStyleRanges|entityRanges|data|syntax|javascript|1406713|用于从NIB加载视图，并希望在启动后执行任何自定义|unstyled|1406714|LoadView()|1406715|当您想要以编程方式创建视图时(不使用Interface+Builder)|1406716|entityMap^0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|M|8|@]|9|@]|A|$B|C]]|$1|D|3|E|5|F|7|N|8|@]|9|@]|A|$]]|$1|G|3|H|5|6|7|O|8|@]|9|@]|A|$B|C]]|$1|I|3|J|5|F|7|P|8|@]|9|@]|A|$]]|$1|K|3|-4|5|F|7|Q|8|@]|9|@]|A|$]]]|L|$]]

<pre><code>viewDidLoad()
</code></pre>

is to be used when you load your view from a NIB and want to perform any customization after launch

<pre><code>LoadView()
</code></pre>

is to be used when you want to create your view programmatically (without the use of Interface Builder)

blocks|key|1621587|text|当您的控制器被要求创建其self.view时，将调用loadView()。你可以自己做，就像这样|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|1621588|self.view+=+[UIView+alloc]+init...];|code-block|syntax|javascript|1621589|或者您的控制器的父UIController类已经有一个方法名为-loadView()，它将您的self.view初始化为空白视图。然后你就可以调用|1621590|[super+loadView];|1621591|我真的推荐第二种方法，因为它鼓励继承。仅当您的视图控制器不是直接从UIViewController继承时。|1621592|entityMap^0|C|9|Q|A|0|0|V|B|0|0|0^^$0|@$1|2|3|4|5|6|7|S|8|@$9|T|A|U|B|C]|$9|V|A|W|B|C]]|D|@]|E|$]]|$1|F|3|G|5|H|7|X|8|@]|D|@]|E|$I|J]]|$1|K|3|L|5|6|7|Y|8|@$9|Z|A|10|B|C]]|D|@]|E|$]]|$1|M|3|N|5|H|7|11|8|@]|D|@]|E|$I|J]]|$1|O|3|P|5|6|7|12|8|@]|D|@]|E|$]]|$1|Q|3|-4|5|6|7|13|8|@]|D|@]|E|$]]]|R|$]]

<code>loadView()</code> is called when your controller is asked to create its <code>self.view</code>. You can do it by yourself like 

<pre><code>self.view = [UIView alloc] init...];
</code></pre>

Or your controller's parent UIController class has already a method name <code>-loadView()</code> which initializes your self.view into blank view. Then you can call

<pre><code>[super loadView];
</code></pre>

I really recommend the second approach as it encourages the inheritance. Only if your view controller is not directly inherited from UIViewController.

blocks|key|1621632|text|苹果公司在viewDidLoad上给出的定义提到，它是在控制器的视图加载到内存之后调用的。简单地说，它是加载的第一个方法。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1621633|你可能会想，这种方法在什么情况下才能得到充分利用？答案是，基本上，无论你想让应用程序首先加载什么。例如，你可能想要一个不同的背景颜色，而不是白色，你也许可以选择蓝色。|1621634|entityMap^0|0|0^^$0|@$1|2|3|4|5|6|7|F|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|G|8|@]|9|@]|A|$]]|$1|D|3|-4|5|6|7|H|8|@]|9|@]|A|$]]]|E|$]]

The definition given by Apple on viewDidLoad mentioned that it is called after the controller’s view is loaded into memory. To put it in a simple term, it is the first method that will load.

You might be thinking under what condition will this method being fully utilized? The answer is, basically whatever you wanted the app to load first. For instance, you might want a different background color, instead of white, you could perhaps choose blue.

When working with views and view controllers in an iPhone app, can anyone explain the difference between loadView and viewDidLoad? 

My personal context, is that I build all my views from code, I do not and will not use Interface Builder, should that make any difference.

I've found that often when I add init code to loadView, I end up with an infinite stack trace, so I typically do all my child-view building in viewDidLoad...but it's really unclear to me when each gets executed, and what is the more appropriate place to put init code. What would be perfect, is a simple diagram of the initialization calls.

Thanks!

iPhone SDK: what is the difference between loadView and viewDidLoad?

在使用iPhone应用程序中的视图和视图控制器时，有人能解释一下loadView和viewDidLoad之间的区别吗？我的个人背景是，我所有的视图都是从代码构建的，我不会也不会使用Interface Builder，如果这会有什么不同的话。我发现，当我将初始化代码添加到loadView中时，我经常会得到无限的堆栈跟踪，...

问iPhone SDK: loadView和viewDidLoad有什么区别？
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