blocks|key|498203|text|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:%5E(AFHTTPRequestOperation+*operation,+id+responseObject)+{
++++NSLog(@"Successfully+downloaded+file+to+%25@",+path);
}+failure:%5E(AFHTTPRequestOperation+*operation,+NSError+*error)+{
++++NSLog(@"Error:+%25@",+error);
}];

[operation+start];|type|code-block|depth|inlineStyleRanges|entityRanges|data|syntax|javascript|498204|unstyled|entityMap^0|0^^$0|@$1|2|3|4|5|6|7|G|8|@]|9|@]|A|$B|C]]|$1|D|3|-4|5|E|7|H|8|@]|9|@]|A|$]]]|F|$]]

<pre><code>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];
</code></pre>

blocks|key|713724|text|我将从@mattt的回答中跳出来，并使用AFHTTPRequestOperationManager发布一个AFNetworking+2.0版本。|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|713725|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:%5E(AFHTTPRequestOperation+*operation,+id+responseObject)+{
+++++++++NSLog(@"successful+download+to+%25@",+path);
++++}+failure:%5E(AFHTTPRequestOperation+*operation,+NSError+*error)+{
+++++++++NSLog(@"Error:+%25@",+error);
++++}];
op.outputStream+=+[NSOutputStream+outputStreamToFileAtPath:path+append:NO];|code-block|syntax|javascript|713726|entityMap^0|K|T|0|0^^$0|@$1|2|3|4|5|6|7|M|8|@$9|N|A|O|B|C]]|D|@]|E|$]]|$1|F|3|G|5|H|7|P|8|@]|D|@]|E|$I|J]]|$1|K|3|-4|5|6|7|Q|8|@]|D|@]|E|$]]]|L|$]]

I'm gonna bounce off @mattt's answer and post a version for AFNetworking 2.0 using <code>AFHTTPRequestOperationManager</code>. 

<pre><code>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];
</code></pre>

blocks|key|713760|text|除了前面的答案之外，在AFNetworking+2.5.0和iOS7/8中，我发现打开输出流的额外步骤也是为了防止应用程序挂起(并最终由于内存不足而崩溃)。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|713761|operation.outputStream+=+[NSOutputStream+outputStreamToFileAtPath:dest
++++++++++++++++++++++++++++++++++++++++++++++++++++++++++append:NO];
[operation.outputStream+open];
[operation+start];|code-block|syntax|javascript|713762|entityMap^0|0|0^^$0|@$1|2|3|4|5|6|7|I|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|J|8|@]|9|@]|A|$E|F]]|$1|G|3|-4|5|6|7|K|8|@]|9|@]|A|$]]]|H|$]]

In addition to the previous answers, with AFNetworking 2.5.0 and iOS7/8 I have found that that the extra step of opening the output stream is also needed to prevent the app from hanging (and eventually crashing from lack of memory).

<pre><code>operation.outputStream = [NSOutputStream outputStreamToFileAtPath:dest
 append:NO];
[operation.outputStream open];
[operation start];
</code></pre>

blocks|key|498379|text|AFHTTPRequestOperationManager+*manager+=+[AFHTTPRequestOperationManager+manager];

manager.responseSerializer+=+[AFCompoundResponseSerializer+serializer];

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

AFHTTPRequestOperation+*operation+=+[manager+GET:url+++parameters:nil+success:%5E(AFHTTPRequestOperation+*operation,+id+responseObject)+{
++++if+(responseObject)+{
++++++++//+your+code+here
++++}+else+{
++++++++//+your+code+here
++++}
}+failure:%5E(AFHTTPRequestOperation+*operation,+NSError+*error)+{

}];

[operation+start];|type|code-block|depth|inlineStyleRanges|entityRanges|data|syntax|javascript|498380|//+manager.responseSerializer.acceptableContentTypes+=+NSSet+setWithObject：@“应用程序/八位字节流”；可以根据您期望的内容而有所不同|unstyled|498381|entityMap^0|0|0^^$0|@$1|2|3|4|5|6|7|I|8|@]|9|@]|A|$B|C]]|$1|D|3|E|5|F|7|J|8|@]|9|@]|A|$]]|$1|G|3|-4|5|F|7|K|8|@]|9|@]|A|$]]]|H|$]]

<pre><code>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];
</code></pre>

// manager.responseSerializer.acceptableContentTypes = [NSSet setWithObject: @"application/octet-stream"]; can vary depending on what you expect

blocks|key|498428|text|Documentation+page有一个“创建下载任务”部分的示例：|type|unstyled|depth|inlineStyleRanges|entityRanges|offset|length|data|498429|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:%5ENSURL+*(NSURL+*targetPath,+NSURLResponse+*response)+{
++++NSURL+*documentsDirectoryURL+=+[[NSFileManager+defaultManager]+URLForDirectory:NSDocumentDirectory+inDomain:NSUserDomainMask+appropriateForURL:nil+create:NO+error:nil];
++++return+[documentsDirectoryURL+URLByAppendingPathComponent:[response+suggestedFilename]];
}+completionHandler:%5E(NSURLResponse+*response,+NSURL+*filePath,+NSError+*error)+{
++++NSLog(@"File+downloaded+to:+%25@",+filePath);
}];
[downloadTask+resume];|code-block|syntax|javascript|498430|注意！使用iOS+7%2B的代码工作(使用AFNetworking+2.5.1进行了测试)|498431|entityMap|0|LINK|mutability|MUTABLE|url|https://github.com/AFNetworking/AFNetworking^0|0|I|0|0|0|0^^$0|@$1|2|3|4|5|6|7|S|8|@]|9|@$A|T|B|U|1|V]]|C|$]]|$1|D|3|E|5|F|7|W|8|@]|9|@]|C|$G|H]]|$1|I|3|J|5|6|7|X|8|@]|9|@]|C|$]]|$1|K|3|-4|5|6|7|Y|8|@]|9|@]|C|$]]]|L|$M|$5|N|O|P|C|$Q|R]]]]

<a href="https://github.com/AFNetworking/AFNetworking" rel="nofollow">Documentation page</a> has example with section 'Creating a Download Task':

<pre><code>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];
</code></pre>

NB! Code work with iOS 7+ (tested with AFNetworking 2.5.1)

blocks|key|498461|text|来自AFNetworking文档。保存到加载的文件到您的文档。AFNetworking+3.0|type|unstyled|depth|inlineStyleRanges|entityRanges|offset|length|data|498462|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:%5ENSURL+*(NSURL+*targetPath,+NSURLResponse+*response)+{
++++NSURL+*documentsDirectoryURL+=+[[NSFileManager+defaultManager]+URLForDirectory:NSDocumentDirectory+inDomain:NSUserDomainMask+appropriateForURL:nil+create:NO+error:nil];
++++return+[documentsDirectoryURL+URLByAppendingPathComponent:[response+suggestedFilename]];
}+completionHandler:%5E(NSURLResponse+*response,+NSURL+*filePath,+NSError+*error)+{
++++NSLog(@"File+downloaded+to:+%25@",+filePath);
}];
[downloadTask+resume];|code-block|syntax|javascript|498463|entityMap|0|LINK|mutability|MUTABLE|url|https://github.com/AFNetworking/AFNetworking^0|2|C|0|0|0^^$0|@$1|2|3|4|5|6|7|Q|8|@]|9|@$A|R|B|S|1|T]]|C|$]]|$1|D|3|E|5|F|7|U|8|@]|9|@]|C|$G|H]]|$1|I|3|-4|5|6|7|V|8|@]|9|@]|C|$]]]|J|$K|$5|L|M|N|C|$O|P]]]]

From <a href="https://github.com/AFNetworking/AFNetworking" rel="nofollow">AFNetworking</a> docs.
Save to loaded file to your documents.
AFNetworking 3.0

<pre><code>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];
</code></pre>

I am using the AFNetworking library. I can't figure out how to download a file and save it to the documents directory.

How to download a file and save it to the documents directory with AFNetworking?

我正在使用AFNetworking库。我不知道如何下载文件并将其保存到文档目录。

问如何使用AFNetworking下载文件并保存到documents目录？
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问如何使用AFNetworking下载文件并保存到documents目录？
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