我如何找到一个类继承自一个特定的类从我的类列表？ [英] How can I find a class which inherit from a particular class from my Class list?

问题描述

我得到我的应用程序的所有类的列表。

I get the list of all classes of my application.

我想从我的列表中找到继承自MySpecificWrapperClass的每个类。

I want to find each Class from my list which inherits from MySpecificWrapperClass.

int numClasses = objc_getClassList(NULL, 0);
Class *classes = malloc(sizeof(Class) * numClasses);
objc_getClassList(classes, numClasses);
for (int i = 0; i < numClasses; i++) {
    Class class = classes[i];
    if( isThisClassInheritsFrom(class,MySpecificWrapperClass )){
       MySpecificWrapperClass o = [[class alloc]init];
       ...
    }
} 
free(classes); 

剂量有人知道如何做？
感谢帮助。
Fred

Dose somebody know how to do that? Thank for help. Fred

推荐答案

可能有更好的解决方案，但强力应该做。 class_getSuperclass 返回给定类对象的超类的类对象。当你到达根类，它返回 Nil 。

There may be a better solution, but brute force should do it. class_getSuperclass returns the Class object for a given Class object's superclass. When you get to the root class, it returns Nil.

for (int i = 0; i < numClasses; i++) {
    Class class = classes[i];
    Class superclass = class_getSuperclass(class);
    while( superclass != Nil ){
        if( superclass == MySpecificWrapperClass ){
           // Got one!
           break;
        }
        superclass = class_getSuperclass(superclass);
    };
}

这是假设您要检查 >对于给定类的层次结构，即，你希望每个类都有你的类在其祖先的任何地方。如果你只关心直接子类，显然，你只需要调用 class_getSuperclass 一次。

This is assuming that you want to check the entire hierarchy for a given class, i.e., you want every class that has your class anywhere in its ancestors. If you only care about direct subclasses, obviously, you only need to call class_getSuperclass once.

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