oc运行时获取类属性列表

- (NSArray *)propertys
{
    unsigned int count = 0;
    //获取属性的列表
    objc_property_t *propertyList =  class_copyPropertyList([self class], &count);
    NSMutableArray *propertyArray = [NSMutableArray array];
    
    for(int i=0;i<count;i++)
    {
        //取出每一个属性
        objc_property_t property = propertyList[i];
        //获取每一个属性的变量名
        const char* propertyName = property_getName(property);
        
        NSString *proName = [[NSString alloc] initWithCString:propertyName encoding:NSUTF8StringEncoding];
        
        [propertyArray addObject:proName];
    }
    //c语言的函数，所以要去手动的去释放内存
    free(propertyList);

    return propertyArray.copy;
    
}- (NSArray *)propertys
{
    unsigned int count