如何使用IOS实现WIFI传输

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

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？

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 = selfwebServer?.allowHiddenItems = truewebServer?.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 iPhoneif ([[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]?dd?|2[0-4]d|25[0-5]).' '([01]?dd?|2[0-4]d|25[0-5]).' '([01]?dd?|2[0-4]d|25[0-5]).' '([01]?dd?|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 interfacesstruct 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 memoryfreeifaddrs(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?.porthttp://(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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