设置IPv4PreferredOverIPv6 属性为NO即可。
就这么简单：）
得到@郭秀才的提示.
如果你还是想用IP地址作为Host发起连接的话, 还需要做一个地方的修改
+ (NSMutableArray *)lookupHost:(NSString *)host port:(uint16_t)port error:(NSError **)errPtr {
//....
for (res = res0; res; res = res->ai_next)
{
if (res->ai_family == AF_INET)
{
// Found IPv4 address.
// Wrap the native address structure, and add to results.
if (((struct sockaddr_in *)res->ai_addr)->sin_port == 0)
((struct sockaddr_in *)res->ai_addr)->sin_port = htons(port);
NSData *address4 = [NSData dataWithBytes:res->ai_addr length:res->ai_addrlen];
[addresses addObject:address4];
}
else if (res->ai_family == AF_INET6)
{
// Found IPv6 address.
// Wrap the native address structure, and add to results.
// 此处修改的合理性, 有待考察, Apple建议对IPv6-Only的支持方式是取消使用IP地址, 全部改用域名的方式
// 域名方式下, sin_port是有正确的值的.
// 另外, IPv6 是否允许路由器变更端口, 这个也有待考察, 如果允许路由器变更端口, 那么这段代码的处理就有BUG了
if (((struct sockaddr_in6 *)res->ai_addr)->sin6_port == 0)
((struct sockaddr_in6 *)res->ai_addr)->sin6_port = htons(port);
NSData *address6 = [NSData dataWithBytes:res->ai_addr length:res->ai_addrlen];
[addresses addObject:address6];
}
}
//....
}
相关的修改已经提交到了这里
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......
for (res = res0; res; res = res->ai_next)
{
if (res->ai_family == AF_INET)
{
// Found IPv4 address.
// Wrap the native address structure, and add to results.
//Add IPv6-only network support
if (((struct sockaddr_in *)res->ai_addr)->sin_port == 0)
((struct sockaddr_in *)res->ai_addr)->sin_port = htons(port);
//end Add
NSData *address4 = [NSData dataWithBytes:res->ai_addr length:res->ai_addrlen];
[addresses addObject:address4];
}
else if (res->ai_family == AF_INET6)
{
// Found IPv6 address.
// Wrap the native address structure, and add to results.
// Add IPv6-only network support
if (((struct sockaddr_in6 *)res->ai_addr)->sin6_port == 0)
((struct sockaddr_in6 *)res->ai_addr)->sin6_port = htons(port);
//end Add
NSData *address6 = [NSData dataWithBytes:res->ai_addr length:res->ai_addrlen];
[addresses addObject:address6];
}
}
......
这样子调整后，不管是上传还是下载都可以完美适配IPv6-only network，亲测有效。