Question

这里正在创建下载任务

- (void)viewDidLoad
{
    [super viewDidLoad];

    NSURLSessionConfiguration *sessionConfiguration = [NSURLSessionConfiguration defaultSessionConfiguration];
    NSURLSession *session = [NSURLSession sessionWithConfiguration:sessionConfiguration delegate:self delegateQueue:nil];
    NSURLSessionDownloadTask *downloadTask = [session downloadTaskWithURL:[NSURL URLWithString:@"http://app.msf.gov.sg/Portals/0/Summary/assistance/CSSD/ComCare%20@%20a%20Glance%20-%20English%20(final).pdf"]];
    [downloadTask resume];
    // Do any additional setup after loading the view from its nib.
}

这里正在成功下载pdf文件

- (void)URLSession:(NSURLSession *)session downloadTask:(NSURLSessionDownloadTask *)downloadTask didFinishDownloadingToURL:(NSURL *)location {
    NSData *data = [NSData dataWithContentsOfURL:location];

    dispatch_async(dispatch_get_main_queue(), ^{
        [self.progressView setHidden:YES];

    });
}

现在我的问题是我如何存储该pdf文件并再次检索请帮我提前谢谢..

Answer 1

只需将文件从“位置”移动到您的文档目录：

NSFileManager *fileManager = [NSFileManager defaultManager];
NSURL *docFolder = [[fileManager URLsForDirectory:NSDocumentDirectory inDomains:NSUserDomainMask] firstObject];
NSURL *fileURL = [docFolder URLByAppendingPathComponent:@"file.pdf" isDirectory:NO];
[fileManager moveItemAtURL: location toURL:fileURL error:nil];

NSLog(@" pdf file is here %@", fileURL);

Answer 2

我们必须将位置复制到我们的文档目录

NSError *error;

NSString *fileName = downloadTask.originalRequest.URL.lastPathComponent;

NSArray *docDir = NSSearchPathForDirectoriesInDomains(NSDocumentationDirectory, NSUserDomainMask, YES);
NSString *loc = [docDir objectAtIndex:0];
NSString *filePathName = [loc stringByAppendingString:fileName];

NSFileManager *fileMgr = [NSFileManager defaultManager];

if ([fileMgr fileExistsAtPath:filePathName]) {
    [fileMgr removeItemAtPath:filePathName error:&error];
}

BOOL success =  [fileMgr copyItemAtPath:[location path] toPath:filePathName error:&error];
if (success) {
    NSLog(@"FIle is successfully copied to documents directory");
}else{
    NSLog(@"error:%@",error.description);
}

将下载的pdf文件存储在文档目录中并检索

2 个答案: