iOS 擷取類所有子類

 

#include <objc/runtime.h>

 

+ (NSArray *)findAllOf:(Class)defaultClass

{

  int count = objc_getClassList(NULL, 0);

  if (count <= 0)

  {

    @throw@"Couldn't retrieve Obj-C class-list";

    return [NSArray arrayWithObject:defaultClass];

  }

 

  NSMutableArray *output = [NSMutableArray arrayWithObject:defaultClass];

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

  objc_getClassList(classes, count);

  for (int i = 0; i < count; ++i) {

    if (defaultClass == class_getSuperclass(classes[i]))//子類

    {

      [output addObject:classes[i]];

    }

  }

  free(classes);

  return [NSArray arrayWithArray:output];

}

 

用法 NSArray *arrayChildClass = [self findAllOf: [UIView  Class] ] ;//擷取UIView的所以子類