class_getClassMethod 通常返回 nil （似乎仅适用于类级别方法）

发布于 2024-09-12 19:05:48 字数 2023 浏览 5 评论 0原文

我目前正在尝试使用 http://sudzc.com/ 生成的代码此代码并不完全适合我的 Web 服务，因此我尝试将类别添加到某些生成的类中，并使用“objc/runtime.h”中的 method_exchangeImplementations 与原始类交换其实现。（我可以直接修改生成的代码，但我想避免它）。

这是我在 MyAppAppDelegate - applicationDidFinishLaunching 方法中执行的代码

Class theClass = [CBMayaIPhoneUser class];
Method originalMethod = class_getClassMethod(theClass, @selector(initWithNode:));
Method categoryMethod = class_getClassMethod(theClass, @selector(initWithAllStringNode:));
method_exchangeImplementations(originalMethod, categoryMethod);

theClass = [Soap class];
originalMethod = class_getClassMethod(theClass, @selector(getNodeValue:withName:));
categoryMethod = class_getClassMethod(theClass, @selector(getHrefNodeValue:withName:));
method_exchangeImplementations(originalMethod, categoryMethod);

theClass = [SoapRequest class];
originalMethod = class_getClassMethod(theClass, @selector(send));
categoryMethod = class_getClassMethod(theClass, @selector(sendIgnoringCertificate));
method_exchangeImplementations(originalMethod, categoryMethod);
originalMethod = class_getClassMethod(theClass, @selector(connectionDidFinishLoading:));
categoryMethod = class_getClassMethod(theClass, @selector(connectionDidFinishLoadingAndSentBody:));
method_exchangeImplementations(originalMethod, categoryMethod);

正如我的问题中所述，几乎所有这些 class_getClassMethod 都返回 nil...我使用了调试器，所以我知道“theClass”设置正确。找到的唯一方法是 Soap 类的方法，它们都是类级别 (+) 方法。但从网上的各种例子中，我得出的结论是它也应该适用于其他人...

以下是我对 MyAppAppDelegate.m 的包含：

#import "MyAppAppDelegate.h"
#import "RootViewController.h"
#import "MyGlobalVariables.h"
#import "MyWebServiceExample.h"
#import "Soap+Href.h"
#import "SoapRequest+Certificate.h"
#import "CBMayaIPhoneUser+AllString.h"
#import "objc/runtime.h"

我也测试了我的类别并且它们有效，我可以从“originalClass”调用类别方法目的。

我想我做错了什么，但我看不到什么......或者也许是 class_getClassMethod 确实应该只适用于类级别方法吗？

哦，最后一件事，我是在模拟器上开发的，而不是设备上:)

欢迎任何想法！

谢谢

P.B

原文

Im currently trying to use some generated code from http://sudzc.com/
This code is not perfectly adapted to my web services, so I tried to add Categories to some of the generated classes and to exchange their implementations with the original ones using method_exchangeImplementations from "objc/runtime.h". (I could modify the generated code directly but I want to avoid it).

Here is the code I execute in MyAppAppDelegate - applicationDidFinishLaunching method

Class theClass = [CBMayaIPhoneUser class];
Method originalMethod = class_getClassMethod(theClass, @selector(initWithNode:));
Method categoryMethod = class_getClassMethod(theClass, @selector(initWithAllStringNode:));
method_exchangeImplementations(originalMethod, categoryMethod);

theClass = [Soap class];
originalMethod = class_getClassMethod(theClass, @selector(getNodeValue:withName:));
categoryMethod = class_getClassMethod(theClass, @selector(getHrefNodeValue:withName:));
method_exchangeImplementations(originalMethod, categoryMethod);

theClass = [SoapRequest class];
originalMethod = class_getClassMethod(theClass, @selector(send));
categoryMethod = class_getClassMethod(theClass, @selector(sendIgnoringCertificate));
method_exchangeImplementations(originalMethod, categoryMethod);
originalMethod = class_getClassMethod(theClass, @selector(connectionDidFinishLoading:));
categoryMethod = class_getClassMethod(theClass, @selector(connectionDidFinishLoadingAndSentBody:));
method_exchangeImplementations(originalMethod, categoryMethod);

As stated in my question, nearly all of those class_getClassMethod are returning nil... I used the debugger so I know 'theClass' is rightly set. The only method being found are those of the Soap class, which are both class level (+) methods. But from various examples on the net I concluded that it should work for the others as well...

Here are my includes for MyAppAppDelegate.m :

#import "MyAppAppDelegate.h"
#import "RootViewController.h"
#import "MyGlobalVariables.h"
#import "MyWebServiceExample.h"
#import "Soap+Href.h"
#import "SoapRequest+Certificate.h"
#import "CBMayaIPhoneUser+AllString.h"
#import "objc/runtime.h"

I tested my categories too and they work, I can call the category methods from a 'originalClass' object.

I suppose I'm doing something wrong, but I can't see what... Or maybe class_getClassMethod
is indeed supposed to work only for class level methods ?

Ho and last thing, Im developing on the simulator, not the device :)

Any thought is welcome !

Thanks

P.B

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