iOS上傳影象到伺服器，以及伺服器PHP接收的幾種方法

1. 將圖片轉換為Base64編碼，POST上傳。PHP將Base64解碼為二進位制，再寫出檔案。缺點：不能上傳較大的圖片

// iOS(Swift)
func upload(image: UIImage, url: String) {
    let imageData = UIImageJPEGRepresentation(image, 0.3) // 將圖片轉換成jpeg格式的NSData，壓縮到0.3
    let imageStr = imageData?.base64EncodedStringWithOptions(.Encoding64CharacterLineLength) // 將圖片轉換為base64字串
 

    let params: NSDictionary = ["file": imageStr!]
    let manager = AFHTTPRequestOperationManager()

    // 採用POST的方式上傳，因為POST對長度沒有限制
    manager.POST(url, parameters: params, success: { (_: AFHTTPRequestOperation!, response: AnyObject!) in
        // 成功
    }) { (_: AFHTTPRequestOperation!, _: NSError!) in
 

        // 失敗
    }
}

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<?php
header('Content-type: text/json; charset=UTF-8');

$base64 = $_POST["file"]; // 得到引數
$img = base64_decode($base64); // 將格式為base64的字串解碼
$path = "md5(uniqid(rand()))"
 
.".jpg"; // 產生隨機唯一的名字作為檔名
file_put_contents($path, $img); // 將圖片儲存到相應位置
?>

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2.將圖片封裝在Http的請求報文中的請求體（body）中上傳。也是AFN上傳的原理

http://www.iashes.com/2016-03-1313.html

// 使用OC封裝
#import <UIKit/UIKit.h>
@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"];

    //分界線的識別符號
    NSString *TWITTERFON_FORM_BOUNDARY = @"AaB03x";
    //根據url初始化request
    NSMutableURLRequest* request = [NSMutableURLRequest requestWithURL:[NSURL URLWithString:url]
                                                           cachePolicy:NSURLRequestReloadIgnoringLocalCacheData
                                                       timeoutInterval:10];
    //分界線 --AaB03x
    NSString *MPboundary=[[NSString alloc]initWithFormat:@"--%@",TWITTERFON_FORM_BOUNDARY];
    //結束符 AaB03x--
    NSString *endMPboundary=[[NSString alloc]initWithFormat:@"%@--",MPboundary];
    //要上傳的圖片
    UIImage *image=[params objectForKey:@"file"];
    //得到圖片的data
    NSData* data = UIImagePNGRepresentation(image);
    //http body的字串
    NSMutableString *body=[[NSMutableString alloc]init];
    //引數的集合的所有key的集合
    NSArray *keys= [params allKeys];

    //遍歷keys
    for(int i = 0; i < [keys count]; i++)
    {
        //得到當前key
        NSString *key = [keys objectAtIndex:i];
        //如果key不是file，說明value是字元型別，比如name：Boris
        if(![key isEqualToString:@"file"])
        {
            //新增分界線，換行
            [body appendFormat:@"%@\r\n",MPboundary];
            //新增欄位名稱，換2行
            [body appendFormat:@"Content-Disposition: form-data; name=\"%@\"\r\n\r\n",key];
            //新增欄位的值
            [body appendFormat:@"%@\r\n",[params objectForKey:key]];
        }
    }

    ////新增分界線，換行
    [body appendFormat:@"%@\r\n",MPboundary];
    //宣告file欄位，檔名為image.png
    [body appendFormat:@"Content-Disposition: form-data; name=\"file\"; filename=\"image.png\"\r\n"];
    //宣告上傳檔案的格式
    [body appendFormat:@"Content-Type: image/png\r\n\r\n"];

    //宣告結束符：--AaB03x--
    NSString *end=[[NSString alloc] initWithFormat:@"\r\n%@",endMPboundary];
    //宣告myRequestData，用來放入http body
    NSMutableData *myRequestData = [NSMutableData data];
    //將body字串轉化為UTF8格式的二進位制
    [myRequestData appendData:[body dataUsingEncoding:NSUTF8StringEncoding]];
    //將image的data加入
    [myRequestData appendData:data];
    //加入結束符--AaB03x--
    [myRequestData appendData:[end dataUsingEncoding:NSUTF8StringEncoding]];

    //設定HTTPHeader中Content-Type的值
    NSString *content=[[NSString alloc]initWithFormat:@"multipart/form-data; boundary=%@",TWITTERFON_FORM_BOUNDARY];
    //設定HTTPHeader
    [request setValue:content forHTTPHeaderField:@"Content-Type"];
    //設定Content-Length
    [request setValue:[NSString stringWithFormat:@"%d", [myRequestData length]] forHTTPHeaderField:@"Content-Length"];
    //設定http body
    [request setHTTPBody:myRequestData];
    //http method
    [request setHTTPMethod:@"POST"];

    return request;
}
@end

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// 使用
// Swift
static func uploadPortrait(image: UIImage, url:String) {
    // 使用
    let request = RequestPostUploadHelper.uploadImage(url, uploadImage: image, params: [:])
    // 非同步網路請求
    NSURLConnection.sendAsynchronousRequest(request, queue: NSOperationQueue()) { (response: NSURLResponse?, data: NSData?, error: NSError?) in
        if error != nil {
            // 失敗
        } else {
            // 成功
        }
    }
}

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