使用AFNetworking下载文件

Question

试图为我的iPhone程序编写一个给定文件URL地址的方法，它会下载到iOS应用程序的文档目录。

以下AFNetowrking的文档，它似乎工作正常，但文件名总是一些垃圾。

我正在使用Xcode 5并将AFNetworking 2.0添加到我的项目中。下面的代码，我到目前为止有：

//#import "AFURLSessionManager.h" 

//On load (or wherever): 
[self downloadFile:@"http://www.irs.gov/pub/irs-pdf/fw4.pdf"]; 

-(void)downloadFile:(NSString *)UrlAddress 
{ NSURLSessionConfiguration *configuration = [NSURLSessionConfiguration defaultSessionConfiguration]; 
AFURLSessionManager *manager = [[AFURLSessionManager alloc] initWithSessionConfiguration:configuration]; 

NSURL *URL = [NSURL URLWithString:UrlAddress]; 
NSURLRequest *request = [NSURLRequest requestWithURL:URL]; 

NSURLSessionDownloadTask *downloadTask = [manager downloadTaskWithRequest:request progress:nil destination:^NSURL *(NSURL *targetPath, NSURLResponse *response) 
{ 
    NSURL *documentsDirectoryPath = [NSURL fileURLWithPath:[NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES) firstObject]]; 
    return [documentsDirectoryPath URLByAppendingPathComponent:[targetPath lastPathComponent]]; 
} 
completionHandler:^(NSURLResponse *response, NSURL *filePath, NSError *error) 
{ 
    NSLog(@"File downloaded to: %@", filePath); 
}]; 
[downloadTask resume]; 
} 

最终的结果是，该文件被成功下载到我的文档目录，但有乱码名称：

文件下载到：文件：///用户/ MYNAME /库/ Application％20Support/iPhone％20Simulator/7.0 /应用/ 25188DCA-4277-488E-B08A-4BEC83E59194 /文档/ CFNetworkDownload_60NWIf.tmp

最终的结果我很期待：

文件下载到：file：/// Users/myname/Library/Application％ 20Support/iPhone％20Simulator/7.0 /应用/ 25188DCA-4277-488E-B08A-4BEC83E59194 /文档/ fw4.pdf

我用的CocoaPods添加AFNetworking到我的项目： 荚 'AFNetworking'， “〜> 2.0”

最后，我需要做什么才能获得下载进度？

Answer 1

这是我能够创建答案：

-(void)downloadFile:(NSString *)UrlAddress 
{ 
NSURLRequest *request = [NSURLRequest requestWithURL:[NSURL URLWithString:UrlAddress]]; 
AFHTTPRequestOperation *operation = [[AFHTTPRequestOperation alloc] initWithRequest:request]; 
NSString *pdfName = @"The_PDF_Name_I_Want.pdf"; 

NSArray *paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES); 
NSString *path = [[paths objectAtIndex:0] stringByAppendingPathComponent:pdfName]; 
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 setDownloadProgressBlock:^(NSUInteger bytesRead, long long totalBytesRead, long long totalBytesExpectedToRead) { 

    NSLog(@"Download = %f", (float)totalBytesRead/totalBytesExpectedToRead); 

}]; 
[operation start]; 
} 

我愿意改进或建议:)

Answer 2

只要你可以替换该行：

return [documentsDirectoryPath URLByAppendingPathComponent:[targetPath lastPathComponent]]; 

有：

return [documentsDirectoryPath URLByAppendingPathComponent:@"fw4.pdf"]; 

si nce [targetPath lastPathComponent]返回类似于CFNetworkDownload_60NWIf.tmp