iOS GoldRaccoon第三方FTP文件夹下载失败原因

一、问题描述：1.下载失败报错：

文件写入失败Error Domain=NSCocoaErrorDomain Code=512 "未能将文件“jquery_1_10_2_min.js”存储到文件夹“Q20180104153006399”中。"

原因及解决方法：文件夹下均为文件，不包含子文件夹，GoldRaccoon第三方不会创建存储的本地文件夹，所以需要自己提前手动创建好下载的本地文件夹

NSFileManager *fileManager = [NSFileManager defaultManager];
    
NSString *zhenggedizhi1 = [documentsDirectoryPath stringByAppendingString:[NSString stringWithFormat:@"/%@/Q20180104153006399",@"OralQuesBank"]];
 [fileManager createDirectoryAtPath:zhenggedizhi1 withIntermediateDirectories:YES attributes:nil error:nil];

二、补充：GoldRaccoon基本使用方法

第三方GoldRaccoon使用方法主要参考网址:https://blog.csdn.net/wobushizhaoqian/article/details/72845898?locationNum=10&fps=1

代码：

/** 下载FTP资源 */
#import "GRRequestsManager.h"
#import "GRListingRequest.h"
#import "FCFileManager.h"
<GRRequestsManagerDelegate> 
@property (nonatomic, strong) GRRequestsManager *requestsManager;

- (void)viewDidLoad {
    [super viewDidLoad];
    // Do any additional setup after loading the view.
    self.view.backgroundColor = [UIColor orangeColor];

    UIButton *downBtn = [UIButton buttonWithType:UIButtonTypeCustom];
    [downBtn setTitle:@"下载" forState:UIControlStateNormal];
    downBtn.backgroundColor = [UIColor cyanColor];
    [downBtn addTarget:self action:@selector(startDownClick) forControlEvents:UIControlEventTouchUpInside];
    [self.view addSubview:downBtn];
    [downBtn mas_makeConstraints:^(MASConstraintMaker *make) {
        make.center.equalTo(self.view);
        make.size.mas_equalTo(CGSizeMake(50, 40));
    }];
}

- (void)startDownClick{
    //列表localuser下的文件夹目录，这里做的只是列表目录下面有什么
    [self.requestsManager addRequestForListDirectoryAtPath:@"OralQuesBank/Q20180104153006399"];
    [self.requestsManager startProcessingRequests];
}
#pragma mark *** GRRequestsManagerDelegate ***
//代理方法，每次执行列表方法都会走这个方法
- (void)requestsManager:(id<GRRequestsManagerProtocol>)requestsManager didCompleteListingRequest:(id<GRRequestProtocol>)request listing:(NSArray *)listing{
    //沙盒目录
    NSString *documentsDirectoryPath = [NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES) lastObject];
    GRListingRequest *req = (GRListingRequest *)request;
    //远程文件夹列表
    NSLog(@"%@",listing);
    //打印创建的目录
    NSLog(@"%@",documentsDirectoryPath);
    NSFileManager *fileManager = [NSFileManager defaultManager];
 

    NSString *zhenggedizhi1 = [documentsDirectoryPath stringByAppendingString:[NSString stringWithFormat:@"/%@/Q20180104153006399",@"OralQuesBank"]];
    [fileManager createDirectoryAtPath:zhenggedizhi1 withIntermediateDirectories:YES attributes:nil error:nil];
    
    //文件夹列表枚举
    [listing enumerateObjectsUsingBlock:^(id  _Nonnull obj, NSUInteger idx, BOOL * _Nonnull stop) {
　　　　
        if ([[obj pathExtension] isEqualToString:@""]) {
            //整个地址，在沙盒中创建和远程文件一样的文件夹目录
            NSString *zhenggedizhi = [documentsDirectoryPath stringByAppendingString:[NSString stringWithFormat:@"%@/%@",req.path,obj]];
            //如果沙盒中的这个文件夹不存在就创建
            if (![fileManager fileExistsAtPath:zhenggedizhi]) {
                [fileManager createDirectoryAtPath:zhenggedizhi withIntermediateDirectories:YES attributes:nil error:nil];
            }
            //然后接着递归列举文件夹下的子文件夹下的目录
            [self.requestsManager addRequestForListDirectoryAtPath:[NSString stringWithFormat:@"%@%@",req.path,obj]];
            [self.requestsManager startProcessingRequests];
        }else{
            //如果目录下的不是文件夹，则下载这个文件到沙盒的指定目录下
            NSString *zhenggedizhi = [documentsDirectoryPath stringByAppendingString:[NSString stringWithFormat:@"%@/%@",req.path,obj]];
            //如果沙盒中的这个文件夹不存在就创建
            if (![fileManager fileExistsAtPath:zhenggedizhi]) {
                [fileManager createDirectoryAtPath:zhenggedizhi withIntermediateDirectories:YES attributes:nil error:nil];
            }
            [self.requestsManager addRequestForDownloadFileAtRemotePath:[NSString stringWithFormat:@"%@/%@",req.path,obj] toLocalPath:[documentsDirectoryPath stringByAppendingPathComponent:[NSString stringWithFormat:@"%@%@",req.path,obj]]];
            [self.requestsManager startProcessingRequests];
        }
    }];
    
    
}
- (void)requestsManager:(id<GRRequestsManagerProtocol>)requestsManager didFailRequest:(id<GRRequestProtocol>)request withError:(NSError *)error
{
    NSLog(@"请求失败requestsManager:didFailRequest:withError: 
 %@", error);
    //    NSString *errorStr = [NSString stringWithFormat:@"%@",error];
//    [self downLoadFail];//可添加处理下载失败后自己的删除文件夹路径方法
}

- (void)requestsManager:(id<GRRequestsManagerProtocol>)requestsManager didFailWritingFileAtPath:(NSString *)path forRequest:(id<GRDataExchangeRequestProtocol>)request error:(NSError *)error{
    LSLog(@"文件写入失败%@",error);
}

- (void)requestsManagerDidCompleteQueue:(id<GRRequestsManagerProtocol>)requestsManager{
    LSLog(@"整个文件夹下载完成+++++++++++++++++");
}

#pragma mark - layzy
- (GRRequestsManager *)requestsManager{
    if (!_requestsManager) {
        _requestsManager = [[GRRequestsManager alloc] initWithHostname:@"ftp://11.11.111.11:12" user:@"Administrator" password:@"这是ftp密码"];
        // 设置代理
        _requestsManager.delegate = self;
    }
    return _requestsManager;
}