blocks|key|632195|text|它主要意味着两件事--类及其实现是在运行时定义的。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|632196|方法|632197|目标C采用动态调度。调用方法时，运行库实际上发送消息(通过一系列objc_msgSend函数)，并在类方法表中查找相应的方法。即使没有为类实现方法，目标-C的动态特性允许通过重写resolveInstanceMethod:、forwardingTargetForSelector:或forwardInvocation:方法来处理或重定向消息。您甚至可以使用class_addMethod函数在运行时添加一个方法，或者使用方法-swizzling方法(method_exchangeImplementations函数)交换两种方法的现有实现。|offset|length|style|CODE|632198|类|632199|由于Objective的动态特性，您不仅可以更改方法，还可以添加/设置/删除类的属性和ivars。您甚至可以使用object_setClass函数在运行时更改实例的类。|632200|有更多的方法显示出目标的全部动态力量-C。有关如何使用它们的更多详细信息，您可以参考目标-C运行时页面。|632201|entityMap|0|LINK|mutability|MUTABLE|url|https://developer.apple.com/documentation/objectivec/1456712-objc_msgsend|1|https://developer.apple.com/documentation/objectivec/nsobject/1418500-resolveinstancemethod?language=objc|2|https://developer.apple.com/documentation/objectivec/nsobject/1418855-forwardingtargetforselector?language=objc|3|https://developer.apple.com/documentation/foundation/nsproxy/1416417-forwardinvocation?language=objc|4|https://developer.apple.com/documentation/objectivec/1418901-class_addmethod?language=objc|5|6|https://developer.apple.com/documentation/objectivec/1418905-object_setclass?language=objc|7|https://developer.apple.com/documentation/objectivec/objective-c_runtime?language=objc^0|0|0|W|C|2H|M|34|S|3X|I|4Y|F|69|U|W|C|0|2H|M|1|34|S|2|3X|I|3|4Y|F|4|69|U|5|0|0|1K|F|1K|F|6|0|16|9|7|0^^$0|@$1|2|3|4|5|6|7|1A|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|1B|8|@]|9|@]|A|$]]|$1|D|3|E|5|6|7|1C|8|@$F|1D|G|1E|H|I]|$F|1F|G|1G|H|I]|$F|1H|G|1I|H|I]|$F|1J|G|1K|H|I]|$F|1L|G|1M|H|I]|$F|1N|G|1O|H|I]]|9|@$F|1P|G|1Q|1|1R]|$F|1S|G|1T|1|1U]|$F|1V|G|1W|1|1X]|$F|1Y|G|1Z|1|20]|$F|21|G|22|1|23]|$F|24|G|25|1|26]]|A|$]]|$1|J|3|K|5|6|7|27|8|@]|9|@]|A|$]]|$1|L|3|M|5|6|7|28|8|@$F|29|G|2A|H|I]]|9|@$F|2B|G|2C|1|2D]]|A|$]]|$1|N|3|O|5|6|7|2E|8|@]|9|@$F|2F|G|2G|1|2H]]|A|$]]|$1|P|3|-4|5|6|7|2I|8|@]|9|@]|A|$]]]|Q|$R|$5|S|T|U|A|$V|W]]|X|$5|S|T|U|A|$V|Y]]|Z|$5|S|T|U|A|$V|10]]|11|$5|S|T|U|A|$V|12]]|13|$5|S|T|U|A|$V|14]]|15|$5|S|T|U|A|$V|14]]|16|$5|S|T|U|A|$V|17]]|18|$5|S|T|U|A|$V|19]]]]

<p>Predominantly it means two things - the classes and their implementation are defined in the runtime.</p>
<h1>Methods</h1>
<p>Objective-C uses dynamic dispatching. When a method is invoked, the runtime actually sends a message (via family of <a href="https://developer.apple.com/documentation/objectivec/1456712-objc_msgsend" rel="nofollow noreferrer"><code>objc_msgSend</code></a> functions) and looks for corresponding method in a class methods table. Even if a method wasn't implemented for a class, dynamic nature of the Objective-C allows to handle or redirect the message by overriding <a href="https://developer.apple.com/documentation/objectivec/nsobject/1418500-resolveinstancemethod?language=objc" rel="nofollow noreferrer"><code>resolveInstanceMethod:</code></a>, <a href="https://developer.apple.com/documentation/objectivec/nsobject/1418855-forwardingtargetforselector?language=objc" rel="nofollow noreferrer"><code>forwardingTargetForSelector:</code></a> or <a href="https://developer.apple.com/documentation/foundation/nsproxy/1416417-forwardinvocation?language=objc" rel="nofollow noreferrer"><code>forwardInvocation:</code></a> methods. You can even add a method in runtime using <a href="https://developer.apple.com/documentation/objectivec/1418901-class_addmethod?language=objc" rel="nofollow noreferrer"><code>class_addMethod</code></a> function or exchange existing implementation of two methods using method-swizzling approach (<a href="https://developer.apple.com/documentation/objectivec/1418901-class_addmethod?language=objc" rel="nofollow noreferrer"><code>method_exchangeImplementations</code></a> function).</p>
<h1>Classes</h1>
<p>Thanks to dynamic traits of Objective-C you can change not only methods but also add/set/remove properties and ivars of a class. You can change even a class of an instance in runtime using <a href="https://developer.apple.com/documentation/objectivec/1418905-object_setclass?language=objc" rel="nofollow noreferrer"><code>object_setClass</code></a> function.</p>
<p>There are much more methods that reveal full dynamic power of the Objective-C. You can refer to <a href="https://developer.apple.com/documentation/objectivec/objective-c_runtime?language=objc" rel="nofollow noreferrer">Objective-C Runtime page</a> for more details about what you can do with them.</p>


blocks|key|632173|text|Objective除了按照您的预期运行代码之外，还为您提供了在运行时操作它的行为的许多可能性。基本上，您可以从头创建一个类，并在应用程序运行时向它添加一些方法/属性，或者更改现有选择器 - (也称为方法swizzling+)的实现。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|632174|顺便说一下，您可以在这里找到更多信息：|632175|https://docs.swift.org/swift-book/LanguageGuide/AdvancedOperators.html|offset|length|632176|entityMap|0|LINK|mutability|MUTABLE|url^0|0|0|0|1Y|0|0^^$0|@$1|2|3|4|5|6|7|O|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|P|8|@]|9|@]|A|$]]|$1|D|3|E|5|6|7|Q|8|@]|9|@$F|R|G|S|1|T]]|A|$]]|$1|H|3|-4|5|6|7|U|8|@]|9|@]|A|$]]]|I|$J|$5|K|L|M|A|$N|E]]]]

<p>Objective-C besides running you code as you expect gives you a lot of possibilities to manipulate it’s behaviour at runtime. 
Basically you can create a class from scratch and add some methods/properties to it when your app is running, or change the implementation of an existing selectors — also known as method swizzling.</p>

<p>By the way, you can find more information here: </p>

<p><a href="https://docs.swift.org/swift-book/LanguageGuide/AdvancedOperators.html" rel="nofollow noreferrer">https://docs.swift.org/swift-book/LanguageGuide/AdvancedOperators.html</a></p>


<p>I have learned that using objective C's message dispatch system you can manipulate behaviour at runtime, such as method swizzling or even create classes at runtime.But what does it mean actually to change behaviour at runtime?</p>


What does manipulating behaviour at runtime mean?

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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我已经了解到，使用objective的消息分发系统，您可以在运行时操纵行为，例如在runtime.But中操作方法、swizzling甚至创建类--在运行时更改行为实际上意味着什么？

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