cocoa 检测对象是否存在某一个成员变量属性

//检测对象是否存在该属性 不带下划线的成员变量名

• (BOOL)checkIsExistPropertyWithInstance:(id)instance verifyPropertyName:(NSString *)verifyPropertyName{
  unsigned int count;
  //获取对象里的属性列表
  objc_property_t *properties = class_copyPropertyList([instance class], &count);
  NSMutableArray *nameArray = [[NSMutableArray alloc] initWithCapacity:count];
  for (int i = 0; i < count; i++) {
  objc_property_t property = properties[i];
  //属性名转为字符串
  NSString *propertyName = [[NSString alloc] initWithCString:property_getName(property) encoding:NSUTF8StringEncoding];
  //判断属性是否存在
  if ([propertyName isEqualToString:verifyPropertyName]) {
  free(properties);
  return YES;
  }
  [nameArray addObject:propertyName];
  }
  free(properties);
  return NO;
  }

//获取类的成员变量名 带下划线的成员变量名

• (NSArray *)getVariableNamesByObject:(id)object verifyPropertyName:(NSString *)verifyPropertyName{
  unsigned int numIvars = 0;
  //获取类的所有成员变量
  Ivar * ivars = class_copyIvarList([object class], &numIvars);
  //定义一个数组来接收获取的属性名
  NSMutableArray *nameArray = [[NSMutableArray alloc] initWithCapacity:numIvars];
  for(int i = 0; i < numIvars; i++) {
  //得到单个的成员变量
  Ivar thisIvar = ivars[i];
  //得到这个成员变量的类型
  const char *type = ivar_getTypeEncoding(thisIvar);
  NSString *stringType = [NSString stringWithCString:type encoding:NSUTF8StringEncoding];
  //此处判断非object-c类型时跳过
  if (![stringType hasPrefix:@"@"]) {
  continue;
  }
  //得到成员变量名
  NSString *variableName = [NSString stringWithUTF8String:ivar_getName(thisIvar)];
  [nameArray addObject:variableName];
  //这个函数可以得到成员变量的值
  if ([variableName hasSuffix:verifyPropertyName]) {
  id type1 = object_getIvar(object, thisIvar);
  NSLog(@"%@",[(NSTextField *)type1 stringValue]);
  }
  }
  free(ivars);
  return nameArray;
  }