blocks|key|1730368|text|一次问这么多问题！|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1730369|第一次加载视图时，在viewDidLoad中，您已经可以访问所有容易初始化的UI元素，因此它是配置视图和设置类属性的好地方。|offset|length|style|CODE|1730370|如果已经加载了视图(例如，通过从导航控制器中弹出视图，或取消模态视图控制器)，则不会调用viewDidLoad。因此，如果您想要更改某些内容(背景，添加标签，更改标签的背景，等等)基于视图控制器初始化后可能发生的情况，您必须使用viewWillAppear。|1730371|如果您想动画一个更改，那么您可以使用viewDidAppear，这样用户就可以在视图变得可见之后看到它。|1730372|编辑:这是相关的，如果你使用IB或故事板。有关在代码中创建视图的情况，请参见CitronEvan级的答案。|1730373|entityMap^0|0|A|B|0|18|B|36|E|0|I|D|0|0^^$0|@$1|2|3|4|5|6|7|P|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|Q|8|@$D|R|E|S|F|G]]|9|@]|A|$]]|$1|H|3|I|5|6|7|T|8|@$D|U|E|V|F|G]|$D|W|E|X|F|G]]|9|@]|A|$]]|$1|J|3|K|5|6|7|Y|8|@$D|Z|E|10|F|G]]|9|@]|A|$]]|$1|L|3|M|5|6|7|11|8|@]|9|@]|A|$]]|$1|N|3|-4|5|6|7|12|8|@]|9|@]|A|$]]]|O|$]]

So many questions at once!

The first time the view is loaded, in <code>viewDidLoad</code> you will already have access to all the readily initialized UI elements, so it is a great place to configure the view and to set your class properties.

If you come back to the view if it is already loaded (say, by popping a view from a navigation controller, or dismissing a modal view controller), <code>viewDidLoad</code> will not be called. Thus, if you want to change something (background, add a label, change the background of a label, etc.) based on something that might have happened since the view controller was initialized, you have to use <code>viewWillAppear</code>.

You would use <code>viewDidAppear</code> if you want to animate a change so the user can see it after the view has already become visible.

Edit: this is pertinent for if you use IB or storyboard. See CitronEvanescent's answer for the case that you create your view in code.

blocks|key|2208555|text|如果要创建编程视图，可以在-+(void)+loadView上设置属性--在显示任何内容之前，将调用该方法一次。|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|2208556|通常，我更喜欢实例化-(id)+init中的UI元素，并在loadView中更新它们的UI。|2208557|欲了解更多详细信息：视图构造参考|2208558|entityMap|0|LINK|mutability|MUTABLE|url|http://developer.apple.com/library/ios/#featuredarticles/ViewControllerPGforiPhoneOS/ViewLoadingandUnloading/ViewLoadingandUnloading.html#//apple_ref/doc/uid/TP40007457-CH10-SW1^0|D|H|0|A|A|T|8|0|A|6|0|0^^$0|@$1|2|3|4|5|6|7|R|8|@$9|S|A|T|B|C]]|D|@]|E|$]]|$1|F|3|G|5|6|7|U|8|@$9|V|A|W|B|C]|$9|X|A|Y|B|C]]|D|@]|E|$]]|$1|H|3|I|5|6|7|Z|8|@]|D|@$9|10|A|11|1|12]]|E|$]]|$1|J|3|-4|5|6|7|13|8|@]|D|@]|E|$]]]|K|$L|$5|M|N|O|E|$P|Q]]]]

If you are creating your view programaticaly, you can set your properties on <code>- (void) loadView</code> this method will be call once before anything is displayed.

Generally i prefer instantiating the UI elements in the <code>-(id) init</code> and update their UI in <code>loadView</code>.

For further details : <a href="http://developer.apple.com/library/ios/#featuredarticles/ViewControllerPGforiPhoneOS/ViewLoadingandUnloading/ViewLoadingandUnloading.html#//apple_ref/doc/uid/TP40007457-CH10-SW1" rel="nofollow">View construction reference</a>

blocks|key|1095410|text|可行的方法是类的viewDidLoad或-(id)init、-(id)initWithNibName构造函数。应该避免viewWillAppear和viewDidAppear，因为您不想一次又一次地实例化变量，因为每次视图出现时(来自pop或tabSwitch)都会调用它们，如果您想在再现时更改一些变量值，那么两个方法可能很有用。|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|1095411|entityMap^0|8|B|K|9|U|K|1N|E|22|D|0^^$0|@$1|2|3|4|5|6|7|H|8|@$9|I|A|J|B|C]|$9|K|A|L|B|C]|$9|M|A|N|B|C]|$9|O|A|P|B|C]|$9|Q|A|R|B|C]]|D|@]|E|$]]|$1|F|3|-4|5|6|7|S|8|@]|D|@]|E|$]]]|G|$]]

The feasible method would be <code>viewDidLoad</code> or <code>-(id)init</code>,<code>-(id)initWithNibName</code> constructors of the class.
<code>viewWillAppear</code> and <code>viewDidAppear</code> should be avoided,since you would not like to instantiate your variables again and again since they get called every time the view appears(from pop or tabSwitch).These two methods can be useful in case you want to change some variable values on reappearance

In UIViewControllers I have several methods such as viewDidLoad, viewWillAppear, viewDidAppear, etc.
The question is: "what is the best place to, for example, set the background color of my view, instantiate, and set the background color of a UILabel, or instantiate an object that I set as @property in my class and things like that? "

Thanks!

Where is the best place for... [iPhone]

翻译质量差，导致语言生硬或混乱。

没有提供实际的解决方法或示例。

解答不清晰，无法理解或解决问题。

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在viewWillAppear，viewDidAppear，中，我有几种方法，例如viewDidLoad、等。问题是：“例如，设置视图的背景色、实例化和设置UILabel的背景色，或者实例化类中设置为@property之类的对象的最佳位置是什么？”谢谢!

问哪里是最适合.[iPhone]
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问哪里是最适合.[iPhone]EN