通过运行时来获取该注册类的所有子类

使用该方法需要包含头文件

#import <objc/runtime.h>

//获取该注册类的所有子类

+ (NSArray*)subclassesOfClass:(Class)parentClass

{

int numClasses = objc_getClassList(NULL, 0);

Class *classes = (Class*)malloc(sizeof(Class) * numClasses);

numClasses = objc_getClassList(classes, numClasses);

NSMutableArray *result = [NSMutableArray array];

for(NSInteger i=0; i<numClasses; i++){

Class cls = classes[i];

do{

cls = class_getSuperclass(cls);

}while(cls && cls != parentClass);

if(cls){

[result addObject:classes[i]];

}

}

free(classes);

return [result copy];

}