批量上传、下载及图片多选

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#网络请求
pod 'AFNetworking', '~> 3.0'
#相册多选
pod 'TZImagePickerController'

1.图片多选

用的第三方库如上，觉得挺不错的图片多选组件，UIImage，Assets均有返回（pod search 可找到更多相关的ImagePicker）

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#pragma mark -- imagePicker
- (void)getImagePicker{
    
    TZImagePickerController *imagePickerVc = [[TZImagePickerController alloc] initWithMaxImagesCount:9 delegate:self];
    
    [self presentViewController:imagePickerVc animated:YES completion:nil];
}
- (void)imagePickerController:(TZImagePickerController *)picker didFinishPickingPhotos:(NSArray<UIImage *> *)photos sourceAssets:(NSArray *)assets isSelectOriginalPhoto:(BOOL)isSelectOriginalPhoto{
    if (self.imgArr.count != 0) {
        [self.imgArr removeAllObjects];
    }
    [self.imgArr addObjectsFromArray:photos];
    [self showImgInScrollView];
    [self uploadImg];
}

2.上传下载

AFNetworking3.0的基本上传下载,方法均封装在NetworkTool中
（1）上传
用GCD的方式批量上传：

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#pragma mark -- 上传
- (void)uploadImg{
    
    //GCD方式
    dispatch_group_t group = dispatch_group_create();
    
    for (int i = 0; i<self.imgArr.count; i++) {
        
        dispatch_group_enter(group);
        
        NSURLSessionUploadTask *uploadTask = [NetworkTool uploadImgWithImg:self.imgArr[i] completion:^(NSURLResponse *response, id responseObject, NSError *error) {
            if (error) {
                NSLog(@"第%d张图片上传失败",i+1);
                dispatch_group_leave(group);
            }
            else{
//                NSLog(@"%@",responseObject);
                NSDictionary *dic = responseObject;
                if ([dic[@"flag"] isEqualToString:@"SUCCESS"]) {
                    NSLog(@"第%d张图片上传成功",i+1);
                }
                dispatch_group_leave(group);
            }
        } progress:^(NSProgress *uploadProgress, long long total, long long complet) {
            NSLog(@"%.f%%",(float)complet/total * 100);
        }];
        [uploadTask resume];
    }
    
    dispatch_group_notify(group, dispatch_get_main_queue(), ^{
        NSLog(@"上传完成!");
    });
}

（2）下载
为了实现断点续传，返回一个NSURLSessionDownloadTask便于操作，根据状态判断继续或者暂停

3.网络监听

放到AppDelegate中

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[NetworkTool AFNReachability];

实现如下：

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+ (void)AFNReachability
{
    //1.创建网络监听管理者
    AFNetworkReachabilityManager *manager = [AFNetworkReachabilityManager sharedManager];
    
    //2.监听网络状态的改变
    /*
     AFNetworkReachabilityStatusUnknown          = 未知
     AFNetworkReachabilityStatusNotReachable     = 没有网络
     AFNetworkReachabilityStatusReachableViaWWAN = 3G
     AFNetworkReachabilityStatusReachableViaWiFi = WIFI
     */
    [manager setReachabilityStatusChangeBlock:^(AFNetworkReachabilityStatus status) {
        switch (status) {
            case AFNetworkReachabilityStatusUnknown:
                NSLog(@"未知");
                break;
            case AFNetworkReachabilityStatusNotReachable:
                NSLog(@"没有网络");
                break;
            case AFNetworkReachabilityStatusReachableViaWWAN:
                NSLog(@"3G");
                break;
            case AFNetworkReachabilityStatusReachableViaWiFi:
                NSLog(@"WIFI");
                break;
                
            default:
                break;
        }
    }];
    
    //3.开始监听
    [manager startMonitoring];
}

4.遇到的坑

下载方法中，return的NSURL，如是本地文件路径，要用fileURLWithPath方法

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destination:^NSURL * _Nonnull(NSURL * _Nonnull targetPath, NSURLResponse * _Nonnull response) {
        //下载地址
//        WKNSLog(@"默认下载地址:%@",targetPath);
        
        //设置下载路径，通过沙盒获取缓存地址，最后返回NSURL对象
//        NSString *filePath = [NSSearchPathForDirectoriesInDomains(NSCachesDirectory, NSUserDomainMask, YES)lastObject];
        return [NSURL fileURLWithPath:filePath];
        
}

Demo地址：https://github.com/m1penny/AFTest/
Swift版本：https://github.com/m1penny/NetworkTestSwift/