如何使用IOS实现WIFI传输
作者：森雨豪
这篇文章主要介绍了如何使用IOS实现WIFI传输，对局域网传输和HTTP感兴趣的同学，可以参考下
问题
业务场景上存在需要将手机里的文件、图片传递给其他的设备，
不仅仅局限于传书、资料啥的都有可能传递
方案
最base的方法：设备之间加个云，设备上传资料到云，云同步资料到各个设备，适用于多设备之间，这个没讲的必要
如果是两设备之间，忽略服务器，怎么搞？联想到图书App中的WiFi传书，貌似没云端概念的，怎么做到的？
上菜
采用框架GCDWebServer，通过CocoaPods引入
pod "GCDWebServer", "~> 3.0"
设置本地接收目录，初始化Server并启动
override func viewWillAppear(_ animated: Bool) {
super.viewWillAppear(animated)
if let filepath = NSSearchPathForDirectoriesInDomains(.documentDirectory, .userDomainMask, true).first as NSString? {
let path = filepath.appendingPathComponent("transfer")
if !FileManager.default.fileExists(atPath: path) {
do {
try FileManager.default.createDirectory(atPath: path, withIntermediateDirectories: false, attributes: nil)
} catch {
print(error)
}
}
webServer = GCDWebUploader(uploadDirectory: path)
webServer?.delegate = self
webServer?.allowHiddenItems = true
webServer?.allowedFileExtensions = ["doc", "docx", "xls", "xlsx", "txt", "pdf", "jpeg", "jpg"]
webServer?.title = "善斋工具"
webServer?.prologue = "欢饮使用善斋工具的WIFI管理平台"
webServer?.epilogue = "善斋书屋制作"
if webServer?.start() == true, let address = IPHelper.deviceIPAdress(), address.count > 0, let port = webServer?.port {
ipLb.text = "1.确保设备在同一局域网 \n2.上传时勿关闭该页面 \n3.请网页中输入该地址 \nhttp://\(address):\(port)/"
} else {
ipLb.text = "GCDWebServer not running!"
}
}
}
局域网内获取本机的ip地址，并设置其他设备访问链接
#import <ifaddrs.h>
#import <arpa/inet.h>
#import <net/if.h>
@implementation IPHelper
+ (NSString *)deviceIPAdress {
NSString *address = @"";
struct ifaddrs *interfaces = NULL;
struct ifaddrs *temp_addr = NULL;
int success = 0;
success = getifaddrs(&interfaces);
if (success == 0) { // 0 表示获取成功
temp_addr = interfaces;
while (temp_addr != NULL) {
if( temp_addr->ifa_addr->sa_family == AF_INET) {
// Check if interface is en0 which is the wifi connection on the iPhone
if ([[NSString stringWithUTF8String:temp_addr->ifa_name] isEqualToString:@"en0"]) {
// Get NSString from C String
address = [NSString stringWithUTF8String:inet_ntoa(((struct sockaddr_in *)temp_addr->ifa_addr)->sin_addr)];
}
}
temp_addr = temp_addr->ifa_next;
}
}
freeifaddrs(interfaces);
return address;
}
#define IOS_CELLULAR @"pdp_ip0"
#define IOS_WIFI @"en0"
#define IOS_VPN @"utun0"
#define IP_ADDR_IPv4 @"ipv4"
#define IP_ADDR_IPv6 @"ipv6"
#pragma mark - 获取设备当前网络IP地址
+ (NSString *)getIPAddress:(BOOL)preferIPv4 {
NSArray *searchArray = preferIPv4 ?
@[ IOS_VPN @"/" IP_ADDR_IPv4, IOS_VPN @"/" IP_ADDR_IPv6, IOS_WIFI @"/" IP_ADDR_IPv4, IOS_WIFI @"/" IP_ADDR_IPv6, IOS_CELLULAR @"/" IP_ADDR_IPv4, IOS_CELLULAR @"/" IP_ADDR_IPv6 ] :
@[ IOS_VPN @"/" IP_ADDR_IPv6, IOS_VPN @"/" IP_ADDR_IPv4, IOS_WIFI @"/" IP_ADDR_IPv6, IOS_WIFI @"/" IP_ADDR_IPv4, IOS_CELLULAR @"/" IP_ADDR_IPv6, IOS_CELLULAR @"/" IP_ADDR_IPv4 ] ;
NSDictionary *addresses = [self getIPAddresses];
NSLog(@"addresses: %@", addresses);
__block NSString *address;
[searchArray enumerateObjectsUsingBlock:^(NSString *key, NSUInteger idx, BOOL *stop)
{
address = addresses[key];
//筛选出IP地址格式
if([self isValidatIP:address]) *stop = YES;
} ];
return address ? address : @"0.0.0.0";
}
+ (BOOL)isValidatIP:(NSString *)ipAddress {
if (ipAddress.length == 0) {
return NO;
}
NSString *urlRegEx = @"^([01]?\\d\\d?|2[0-4]\\d|25[0-5])\\."
"([01]?\\d\\d?|2[0-4]\\d|25[0-5])\\."
"([01]?\\d\\d?|2[0-4]\\d|25[0-5])\\."
"([01]?\\d\\d?|2[0-4]\\d|25[0-5])$";
NSError *error;
NSRegularExpression *regex = [NSRegularExpression regularExpressionWithPattern:urlRegEx options:0 error:&error];
if (regex != nil) {
NSTextCheckingResult *firstMatch=[regex firstMatchInString:ipAddress options:0 range:NSMakeRange(0, [ipAddress length])];
if (firstMatch) {
NSRange resultRange = [firstMatch rangeAtIndex:0];
NSString *result=[ipAddress substringWithRange:resultRange];
//输出结果
NSLog(@"%@",result);
return YES;
}
}
return NO;
}
+ (NSDictionary *)getIPAddresses
{
NSMutableDictionary *addresses = [NSMutableDictionary dictionaryWithCapacity:8];
// retrieve the current interfaces - returns 0 on success
struct ifaddrs *interfaces;
if(!getifaddrs(&interfaces)) {
// Loop through linked list of interfaces
struct ifaddrs *interface;
for(interface=interfaces; interface; interface=interface->ifa_next) {
if(!(interface->ifa_flags & IFF_UP) /* || (interface->ifa_flags & IFF_LOOPBACK) */ ) {
continue; // deeply nested code harder to read
}
const struct sockaddr_in *addr = (const struct sockaddr_in*)interface->ifa_addr;
char addrBuf[ MAX(INET_ADDRSTRLEN, INET6_ADDRSTRLEN) ];
if(addr && (addr->sin_family==AF_INET || addr->sin_family==AF_INET6)) {
NSString *name = [NSString stringWithUTF8String:interface->ifa_name];
NSString *type;
if(addr->sin_family == AF_INET) {
if(inet_ntop(AF_INET, &addr->sin_addr, addrBuf, INET_ADDRSTRLEN)) {
type = IP_ADDR_IPv4;
}
} else {
const struct sockaddr_in6 *addr6 = (const struct sockaddr_in6*)interface->ifa_addr;
if(inet_ntop(AF_INET6, &addr6->sin6_addr, addrBuf, INET6_ADDRSTRLEN)) {
type = IP_ADDR_IPv6;
}
}
if(type) {
NSString *key = [NSString stringWithFormat:@"%@/%@", name, type];
addresses[key] = [NSString stringWithUTF8String:addrBuf];
}
}
}
// Free memory
freeifaddrs(interfaces);
}
return [addresses count] ? addresses : nil;
}
在其他设备中访问该地址即可
let address = IPHelper.deviceIPAdress() let port = webServer?.port http://\(address):\(port)/
备注：
- 确保设备在同一局域网
- 上传时勿关闭该页面
Game Over
局域网中，设备作为server，其他设备作为client，简单的HTTP方式上传文件到server，初始配置的路径即为server接收后存放文件的路径
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