Using Objective Runtime API Dump Class hierachy

print_class_hierachy.m

#import <Foundation/Foundation.h>
@import ObjectiveC;

void print_class_hierachy(Class cls){
  printf("%s\n",class_getName(cls));
  Class superclass = class_getSuperclass(cls);
  int current_level = 0;
  while (superclass) {
    current_level++;
    for (int level = 0; level < current_level;level++) {
      if(level + 1 == current_level){
        printf("|----");
      }else{
        printf("    ");
      }
    }
    printf("%s\n",class_getName(superclass));
    superclass = class_getSuperclass(superclass);
  }
}

int main(int argc, const char * argv[]) {
  @autoreleasepool {
    static unsigned int classCount = 0;
    Class * classList = objc_copyClassList(&classCount);
  
    int level = 0;
    int min_print_level = 4;
    for (unsigned int i = 0; i < classCount; i++) {
      Class leafClass = classList[i];
      Class superclass = class_getSuperclass(leafClass);
      level = 0;
      while (superclass) {
        level++;
        superclass = class_getSuperclass(superclass);
      }
      if(level >= min_print_level){
        print_class_hierachy(leafClass);
      }
      
    }
    free(classList);
  

  }
    return 0;
}