二进制文件OC符号恢复求助

动态导出然后写入到文件, 但比不上class-dump, 至少能看了

+ (NSString *)dumpTargetClass:(NSString *)cls_name {
    Class cls = objc_getClass([cls_name UTF8String]);
    NSLog(@"≥ cls %@", cls);
    id ret = [cls performSelector:@selector(_methodDescription)];
    NSLog(@"≥ %@", ret);
    NSMutableString *str = [[NSMutableString alloc]init];
    [str appendString:ret];
    return str;
}