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Como baixar um arquivo e salvá-lo no diretório de documentos com o AFNetworking?

Eu estou usando a biblioteca AFNetworking. Eu não consigo descobrir como baixar um arquivo e salvá-lo no diretório de documentos.

50
iamsmug
NSURLRequest *request = [NSURLRequest requestWithURL:[NSURL URLWithString:@"..."]];
AFHTTPRequestOperation *operation = [[[AFHTTPRequestOperation alloc] initWithRequest:request] autorelease];

NSArray *paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);
NSString *path = [[paths objectAtIndex:0] stringByAppendingPathComponent:@"filename"];
operation.outputStream = [NSOutputStream outputStreamToFileAtPath:path append:NO];

[operation setCompletionBlockWithSuccess:^(AFHTTPRequestOperation *operation, id responseObject) {
    NSLog(@"Successfully downloaded file to %@", path);
} failure:^(AFHTTPRequestOperation *operation, NSError *error) {
    NSLog(@"Error: %@", error);
}];

[operation start];
138
mattt

Eu vou responder à resposta do @ mattt e postar uma versão para o AFNetworking 2.0 usando AFHTTPRequestOperationManager

NSArray *paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);
NSString *path = [[paths objectAtIndex:0] stringByAppendingPathComponent:@"filename"];

AFHTTPRequestOperationManager *manager = [AFHTTPRequestOperationManager manager];
AFHTTPRequestOperation *op = [manager GET:@"http://example.com/file/to/download" 
                               parameters:nil
    success:^(AFHTTPRequestOperation *operation, id responseObject) {
         NSLog(@"successful download to %@", path);
    } failure:^(AFHTTPRequestOperation *operation, NSError *error) {
         NSLog(@"Error: %@", error);
    }];
op.outputStream = [NSOutputStream outputStreamToFileAtPath:path append:NO];
31
swilliams

Eu estou falando sobre AFNetworking 2.0

[AFHTTPRequestOperationManager manager] cria o objeto gerenciador com o AFJSONResponseSerializer padrão e executa a restrição de tipos de conteúdo. Dê uma olhada neste 

- (BOOL)validateResponse:(NSHTTPURLResponse *)response
                    data:(NSData *)data
                   error:(NSError * __autoreleasing *)error

Portanto, precisamos criar um serializador sem resposta e usar AFHTTPRequestOperationManager normalmente. 

Aqui está o AFNoneResponseSerializer

@interface AFNoneResponseSerializer : AFHTTPResponseSerializer

+ (instancetype)serializer;

@end

@implementation AFNoneResponseSerializer

#pragma mark - Initialization
+ (instancetype)serializer
{
    return [[self alloc] init];
}

- (instancetype)init
{
    self = [super init];

    return self;
}

#pragma mark - AFURLResponseSerializer
- (id)responseObjectForResponse:(NSURLResponse *)response
                           data:(NSData *)data
                          error:(NSError *__autoreleasing *)error

{
    return data;
}

@end

uso

self.manager = [AFHTTPRequestOperationManager manager];
self.manager.responseSerializer = [AFNoneResponseSerializer serializer];

[self.manager GET:@"https://sites.google.com/site/iphonesdktutorials/xml/Books.xml"
           parameters:parameters
              success:^(AFHTTPRequestOperation *operation, id responseObject)
    {
        if (success) {
            success(responseObject);
        }
    } failure:^(AFHTTPRequestOperation *operation, NSError *error) {
        if (failure) {
            failure(error);
        }
    }];

para que possamos obter o arquivo inteiro sem qualquer serialização

5
onmyway133

De AFNetworking docs. Salve no arquivo carregado em seus documentos. AFNetworking 3.0

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

NSURL *URL = [NSURL URLWithString:@"http://example.com/download.Zip"];
NSURLRequest *request = [NSURLRequest requestWithURL:URL];

NSURLSessionDownloadTask *downloadTask = [manager downloadTaskWithRequest:request progress:nil destination:^NSURL *(NSURL *targetPath, NSURLResponse *response) {
    NSURL *documentsDirectoryURL = [[NSFileManager defaultManager] URLForDirectory:NSDocumentDirectory inDomain:NSUserDomainMask appropriateForURL:nil create:NO error:nil];
    return [documentsDirectoryURL URLByAppendingPathComponent:[response suggestedFilename]];
} completionHandler:^(NSURLResponse *response, NSURL *filePath, NSError *error) {
    NSLog(@"File downloaded to: %@", filePath);
}];
[downloadTask resume];
4
Mr.Fingers

Página de documentação tem um exemplo com a seção 'Criando uma tarefa de download':

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

NSURL *URL = [NSURL URLWithString:@"http://example.com/download.Zip"];
NSURLRequest *request = [NSURLRequest requestWithURL:URL];

NSURLSessionDownloadTask *downloadTask = [manager downloadTaskWithRequest:request progress:nil destination:^NSURL *(NSURL *targetPath, NSURLResponse *response) {
    NSURL *documentsDirectoryURL = [[NSFileManager defaultManager] URLForDirectory:NSDocumentDirectory inDomain:NSUserDomainMask appropriateForURL:nil create:NO error:nil];
    return [documentsDirectoryURL URLByAppendingPathComponent:[response suggestedFilename]];
} completionHandler:^(NSURLResponse *response, NSURL *filePath, NSError *error) {
    NSLog(@"File downloaded to: %@", filePath);
}];
[downloadTask resume];

NB! Código de trabalho com o iOS 7+ (testado com o AFNetworking 2.5.1)

4
Maxim Kholyavkin
AFHTTPRequestOperationManager *manager = [AFHTTPRequestOperationManager manager];

manager.responseSerializer = [AFCompoundResponseSerializer serializer];

manager.responseSerializer.acceptableContentTypes = [NSSet setWithObject:@"application/octet-stream"];

AFHTTPRequestOperation *operation = [manager GET:url   parameters:nil success:^(AFHTTPRequestOperation *operation, id responseObject) {
    if (responseObject) {
        // your code here
    } else {
        // your code here
    }
} failure:^(AFHTTPRequestOperation *operation, NSError *error) {

}];

[operation start];

// manager.responseSerializer.acceptableContentTypes = [NSSet setWithObject: @ "aplicativo/octeto-stream"]; pode variar dependendo do que você espera

2
Satyam Raikar

Sim, é melhor usar a maneira AFNetworking 2.0 com AFHTTPRequestOperationManager. Com a velha maneira meu arquivo fez download, mas por algum motivo não atualizou no sistema de arquivos. 

Acrescentando ao swilliam's answer, para mostrar o progresso do download, em AFNetworking 2.0 você faz da mesma forma - basta definir o bloco de progresso do download após configurar o fluxo de saída. 

__weak SettingsTableViewController *weakSelf = self;

operation.outputStream = [NSOutputStream outputStreamToFileAtPath:newFilePath append:NO];

[operation setDownloadProgressBlock:^(NSUInteger bytesWritten, long long totalBytesWritten, long long totalBytesExpectedToRead) {

    float progress = totalBytesWritten / (float)totalBytesExpectedToRead;

    NSString *progressMessage = [NSString stringWithFormat:@"%@ \n %.2f %% \n %@ / %@", @"Downloading ...", progress * 100, [weakSelf fileSizeStringWithSize:totalBytesWritten], [weakSelf fileSizeStringWithSize:totalBytesExpectedToRead]];

    [SVProgressHUD showProgress:progress status:progressMessage];
}];

Este é o meu método para criar uma string de bytes: 

- (NSString *)fileSizeStringWithSize:(long long)size
{
    NSString *sizeString;
    CGFloat f;

    if (size < 1024) {
        sizeString = [NSString stringWithFormat:@"%d %@", (int)size, @"bytes"];
    }
    else if ((size >= 1024)&&(size < (1024*1024))) {
        f = size / 1024.0f;
        sizeString = [NSString stringWithFormat:@"%.0f %@", f, @"Kb"];
    }
    else if (size >= (1024*1024)) {
        f = size / (1024.0f*1024.0f);
        sizeString = [NSString stringWithFormat:@"%.0f %@", f, @"Mb"];
    }

    return sizeString;
}
1
wzbozon

Além das respostas anteriores, com o AFNetworking 2.5.0 e o iOS7/8 descobri que a etapa extra de abrir o fluxo de saída também é necessária para evitar que o aplicativo seja interrompido (e, eventualmente, falhe por falta de memória).

operation.outputStream = [NSOutputStream outputStreamToFileAtPath:dest
                                                          append:NO];
[operation.outputStream open];
[operation start];
0
joe