1. 将图片转换为base64编码，post上传。php将base64解码为二进制，再写出文件。缺点：不能上传较大的图片 // ios(swift)func upload(image: uiimage, url: string) { let imagedata = uiimagejpegrepresentation(image, 0.3) // 将图片转换成jpeg格式的nsdata，压缩到0.3 let imagestr = imagedata?.base64encodedstringwithoptions(.encoding64characterlinelength) // 将图片转换为base64字符串 let params: nsdictionary = [file: imagestr!] let manager = afhttprequestoperationmanager() // 采用post的方式上传，因为post对长度没有限制 manager.post(url, parameters: params, success: { (_: afhttprequestoperation!, response: anyobject!) in // 成功 }) { (_: afhttprequestoperation!, _: nserror!) in // 失败 }}

2.afnetworking上传，php端通过正常接收网页上传方法来接收图片 static func uploadportrait(image: uiimage, url: string) { let manager = afhttprequestoperationmanager() // fromdata: afn封装好的http header类，可以添加请求体 manager.post(url, parameters: [:], constructingbodywithblock: { (fromdata: afmultipartformdata!) in let pngdata = uiimagepngrepresentation(image) // name必须和后台php接收的参数名相同($_files[file]) // filename为图片名 fromdata.appendpartwithfiledata(pngdata, name: file, filename: image.png, mimetype: image/png) // let jpegdata = uiimagejpegrepresentation(image, 0.3) // fromdata.appendpartwithfiledata(jpegdata, name: file, filename: image.jpg, mimetype: image/jpeg) }, success: { (operation: afhttprequestoperation!, response: anyobject!) in // 成功 }) { (operation: afhttprequestoperation!, error: nserror!) in // 失败 } }

3.将图片封装在http的请求报文中的请求体（body）中上传。也是afn上传的原理 // 使用oc封装#import @interface requestpostuploadhelper : nsobject+ (nsmutableurlrequest *)uploadimage:(nsstring*)url uploadimage:(uiimage *)uploadimage params:(nsmutabledictionary *)params;@end#import requestpostuploadhelper.h@implementation requestpostuploadhelper+ (nsmutableurlrequest *)uploadimage:(nsstring*)url uploadimage:(uiimage *)uploadimage params:(nsmutabledictionary *)params { [params setobject:uploadimage forkey:@file]; //分界线的标识符 nsstring *twitterfon_form_boundary = @aab03x; //根据url初始化request nsmutableurlrequest* request = [nsmutableurlrequest requestwithurl:[nsurl urlwithstring:url] cachepolicy:nsurlrequestreloadignoringlocalcachedata timeoutinterval:10]; //分界线 --aab03x nsstring *mpboundary=[[nsstring alloc]initwithformat:@--%@,twitterfon_form_boundary]; //结束符 aab03x-- nsstring *endmpboundary=[[nsstring alloc]initwithformat:@%@--,mpboundary]; //要上传的图片 uiimage *image=[params objectforkey:@file]; //得到图片的data nsdata* data = uiimagepngrepresentation(image); //http body的字符串 nsmutablestring *body=[[nsmutablestring alloc]init]; //参数的集合的所有key的集合 nsarray *keys= [params allkeys]; //遍历keys for(int i = 0; i < [keys count]; i++) { //得到当前key nsstring *key = [keys objectatindex:i]; //如果key不是file，说明value是字符类型，比如name：boris if(![key isequaltostring:@file]) { //添加分界线，换行 [body appendformat:@%@\r\n,mpboundary]; //添加字段名称，换2行 [body appendformat:@content-disposition: form-data; name=\%@\\r\n\r\n,key]; //添加字段的值 [body appendformat:@%@\r\n,[params objectforkey:key]]; } } ////添加分界线，换行 [body appendformat:@%@\r\n,mpboundary]; //声明file字段，文件名为image.png [body appendformat:@content-disposition: form-data; name=\file\; filename=\image.png\\r\n]; //声明上传文件的格式 [body appendformat:@content-type: image/png\r\n\r\n]; //声明结束符：--aab03x-- nsstring *end=[[nsstring alloc] initwithformat:@\r\n%@,endmpboundary]; //声明myrequestdata，用来放入http body nsmutabledata *myrequestdata = [nsmutabledata data]; //将body字符串转化为utf8格式的二进制 [myrequestdata appenddata:[body datausingencoding:nsutf8stringencoding]]; //将image的data加入 [myrequestdata appenddata:data]; //加入结束符--aab03x-- [myrequestdata appenddata:[end datausingencoding:nsutf8stringencoding]]; //设置httpheader中content-type的值 nsstring *content=[[nsstring alloc]initwithformat:@multipart/form-data; boundary=%@,twitterfon_form_boundary]; //设置httpheader [request setvalue:content forhttpheaderfield:@content-type]; //设置content-length [request setvalue:[nsstring stringwithformat:@%d, [myrequestdata length]] forhttpheaderfield:@content-length]; //设置http body [request sethttpbody:myrequestdata]; //http method [request sethttpmethod:@post]; return request;}@end
// 使用// swiftstatic func uploadportrait(image: uiimage, url:string) { // 使用 let request = requestpostuploadhelper.uploadimage(url, uploadimage: image, params: [:]) // 异步网络请求 nsurlconnection.sendasynchronousrequest(request, queue: nsoperationqueue()) { (response: nsurlresponse?, data: nsdata?, error: nserror?) in if error != nil { // 失败 } else { // 成功 } }}

4.ios图片转换为nsdata，通过post上传。php接收post参数，将nsdata的16进制编码转换为php支持的二进制，再写出文件保存 暂时没有找到办法，php接收到16进制编码后，使用算法转换为二进制后无法输出图片
5.二进制post上传。php直接将数据保存为图片 暂时没有找到办法，ios端使用nsdata的getbytes无法转换为二进制