IOS 利用AFN上传图片，支持多张、单张上传

前言：本文主要利用AFN来进行图片上传，支持单张、多张；

个人觉得导致上传失败的原因，大部分情况下都是由于

[formData appendPartWithFileData:imageData name:[NSString stringWithFormat:@"upload%d",i+1] fileName:fileName mimeType:@"image/jpeg"];这个方法的参数没有与后台一致导致的。
其中需要跟后台约定的有：

1、name:后台可以通过文件名来获取到相应的图片流；

2、mimeType:更多的是让后台知道你上传的类型；

说白了就是报文头能够让后台识别

NSMutableDictionary *mutableHeaders = [NSMutableDictionary dictionary];
[mutableHeaders setValue:[NSString stringWithFormat:@"form-data; name=\"%@\"; filename=\"%@\"", name, fileName] forKey:@"Content-Disposition"];
[mutableHeaders setValue:mimeType forKey:@"Content-Type"];

具体代码如下

#import <Foundation/Foundation.h>

typedef void(^HttpUploadSuccessBlock)(id Json);
typedef void(^HttpUploadFailureBlock)();

@interface HttpTool : NSObject

/**
* 上传图片(单张)
*
* @param path 路径
* @param image 图片
* @param params 参数
* @param success 成功回调
* @param failure 失败回调
*/
+ (void)uploadImageWithPath:(NSString *)path image:(UIImage *)image params:(NSDictionary *)params success:(HttpUploadSuccessBlock)success failure:(HttpUploadFailureBlock)failure;

/**
* 上传图片(多张)
*
* @param path 路径
* @param photos 图片数组
* @param params 参数
* @param success 成功回调
* @param failure 失败回调
*/
+ (void)uploadImageWithPath:(NSString *)path photos:(NSArray *)photos params:(NSDictionary *)params success:(HttpUploadSuccessBlock)success failure:(HttpUploadFailureBlock)failure;

@end
#import "HttpTool.h"
#import "AFNetworking.h"
#import "SVProgressHUD.h"

static AFHTTPSessionManager *manager;

@implementation HttpTool

//为了防止内存泄露
+ (AFHTTPSessionManager *)sharedHttpSession
{
static dispatch_once_t onceToken;
dispatch_once(&onceToken, ^{
manager = [AFHTTPSessionManager manager];
manager.requestSerializer.timeoutInterval = 10;
manager.responseSerializer.acceptableContentTypes = [NSSet setWithObjects:@"application/json",@"text/json", @"text/plain", @"text/html", nil];
});
return manager;
}

#pragma mark 上传单张图片
+ (void)uploadImageWithPath:(NSString *)path image:(UIImage *)image params:(NSDictionary *)params success:(HttpUploadSuccessBlock)success failure:(HttpUploadFailureBlock)failure
{
NSArray *array = [NSArray arrayWithObject:image];
[self uploadImageWithPath:path photos:array params:params success:success failure:failure];
}

#pragma mark 上传图片
+ (void)uploadImageWithPath:(NSString *)path photos:(NSArray *)photos params:(NSDictionary *)params success:(HttpUploadSuccessBlock)success failure:(HttpUploadFailureBlock)failure
{
[SVProgressHUD showProgress:-1 status:@"正在上传,请稍等."];
path = [path stringByAddingPercentEscapesUsingEncoding:NSUTF8StringEncoding];
AFHTTPSessionManager *manager = [HttpTool sharedHttpSession];
[manager POST:path parameters:params constructingBodyWithBlock:^(id<AFMultipartFormData> _Nonnull formData) {
for (int i = 0; i < photos.count; i ++) {
NSDateFormatter *formatter=[[NSDateFormatter alloc]init];
formatter.dateFormat=@"yyyyMMddHHmmss";
NSString *str=[formatter stringFromDate:[NSDate date]];
NSString *fileName=[NSString stringWithFormat:@"%@.jpg",str];
UIImage *image = photos[i];
NSData *imageData = UIImageJPEGRepresentation(image, 0.28);
[formData appendPartWithFileData:imageData name:[NSString stringWithFormat:@"upload%d",i+1] fileName:fileName mimeType:@"image/jpeg"];
}
} progress:^(NSProgress * _Nonnull uploadProgress) {
MyLog(@"uploadProgress is %lld,总字节 is %lld",uploadProgress.completedUnitCount,uploadProgress.totalUnitCount);
} success:^(NSURLSessionDataTask * _Nonnull task, id _Nullable responseObject) {
NSString *resultCode = [NSString stringWithFormat:@"%@",[responseObject objectForKey:@"result_code"]];
NSString *resultInfo = [responseObject objectForKey:@"result_info"];
MyLog(@"resultInfo is %@",resultInfo);
if ([resultCode isEqualToString:@"1"]) {
[SVProgressHUD showSuccessWithStatus:@"上传成功"];
if (success == nil) return ;
success(responseObject);
}else {
[SVProgressHUD showErrorWithStatus:resultInfo];
if (failure == nil) return ;
failure();
}
} failure:^(NSURLSessionDataTask * _Nullable task, NSError * _Nonnull error) {
[SVProgressHUD showErrorWithStatus:@"上传失败"];
if (failure == nil) return ;
failure();
}];
}