使用AFN上傳一張或多張圖片
-(void)upLoadImage:(NSMutableDictionary *)parametersDic url:(NSString *)strMethod image:(UIImage *)image requestTag:(int)tag withObj:(id)obj andImage2:(UIImage *)image2
{
//parametersDic 請求的參數 strMethod:請求的方法 image上傳的第一張圖片 image2:上傳的第二張圖片 obj:nil tag :1
//定義數組用來保存多張圖片
NSArray *dataArray =nil;
//將圖片轉換為data
NSData *imagedata= UIImageJPEGRepresentation(image, 0.2);//0.2為壓縮倍數
NSData *imagedata2= UIImageJPEGRepresentation(image2,0.2);
NSString *format = @"jpg";
NSString *Suffix = @"jpeg";
//判斷是png jpg格式
if (imagedata == nil || imagedata2 == nil) {
imagedata = UIImagePNGRepresentation(image);
imagedata2 = UIImagePNGRepresentation(image2);
format = @"png";
Suffix = @"png";
}
//判斷有幾張圖片
if (image2 == nil) {
dataArray = @[imagedata];
}else{

    dataArray= @[imagedata,imagedata2];
}

//對應的URL
NSString *urltmps=[[NSString stringWithFormat:@"%@%@.action",Host_url,strMethod] stringByAddingPercentEscapesUsingEncoding:NSUTF8StringEncoding];

//創建請求
NSMutableURLRequest *request=[[AFHTTPRequestSerializer serializer]multipartFormRequestWithMethod:@"POST" URLString:urltmps parameters:parametersDic constructingBodyWithBlock:^(id<AFMultipartFormData> formData) {
//多張圖片的時候才使用循環，單張 圖片不用
for (NSInteger i = 0; i<dataArray.count; i++) {
//獲取當前日期時間作為文件名稱
NSDateFormatter *formatter=[[NSDateFormatter alloc]init];
formatter.dateFormat=@"yyyyMMddHHmmss";
NSString *str=[formatter stringFromDate:[NSDate date]];

    NSString *fileName=[NSString stringWithFormat:@"%@%zd.%@",str,i+1,format];

//對應接口文檔上傳的圖片的類型名稱，這里是file1和file2
NSString *file = [NSString stringWithFormat:@"file%zd",i+1];
[formData appendPartWithFileData:dataArray[i] name:file fileName:fileName mimeType:[NSString stringWithFormat:@"image/%@",Suffix]];
}
} error:nil];

AFURLSessionManager *manager=[[AFURLSessionManager alloc]initWithSessionConfiguration:[NSURLSessionConfiguration defaultSessionConfiguration]];

manager.responseSerializer=[AFHTTPResponseSerializer serializer];

NSURLSessionUploadTask *uploadTask=[manager uploadTaskWithStreamedRequest:request progress:nil completionHandler:^(NSURLResponse *response, id responseObject, NSError *error) {
    if (error)
    {
      //  [self RequestResult:nil requestTag:tag withObj:obj];
    NSLog(@“上傳失敗”);
    }
    else
    {
        //json解析
        NSDictionary *resultDic = [NSJSONSerialization JSONObjectWithData:responseObject options:NSJSONReadingMutableLeaves error:nil];
        
       // [self RequestResult:resultDic requestTag:tag withObj:obj];
        
    }
}];

//執行，沒有這句是不會執行的
[uploadTask resume];

}