iphone pdf下载

Question

 -(IBAction)click; 
    { 

      NSURL *url = [NSURL URLWithString:URL_TO_DOWNLOAD]; 
      NSString *tempDownloadPath = [[self documentsDirectory] 
              stringByAppendingPathComponent:@"test.pdf"]; 
      ASIHTTPRequest *request = [ASIHTTPRequest requestWithURL:url]; 
      [request setDownloadDestinationPath:[self documentsDirectory]]; 
      [request setTemporaryFileDownloadPath:tempDownloadPath]; 
      [request setDelegate:self]; 

    [request startAsynchronous]; 


     } 

    - (void)requestFinished:(ASIHTTPRequest *)request 
     { 
      NSLog(@"requestFinished"); 
      NSError *error; 
      NSFileManager *fileManager = [[NSFileManager alloc] init]; 
      NSLog(@"Documents directory: %@", [fileManager 
               contentsOfDirectoryAtPath:[self 
                      documentsDirectory] error:&error]); 
      NSString *dir = [self documentsDirectory]; 
      NSLog(dir); 
      // NSData *responseData = [request responseData]; 
      NSArray *array = [[NSFileManager defaultManager] 
           contentsOfDirectoryAtPath:dir error:&error]; 
      if (array == nil) { 
       NSLog(@"array == nil"); 
      } 
else 
{ 
[aWebView loadRequest:[NSURLRequest requestWithURL:[NSURL fileURLWithPath:tempDownloadPath]]]; 
     [[self view] addSubview:aWebView]; 
} 

      [fileManager release]; 
       } 

    - (NSString *)documentsDirectory { 
      NSArray *paths = 
      NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, 
               NSUserDomainMask, 
               YES); 
      return [paths objectAtIndex:0]; 
     } 

我无法管理检查文件是否存在，然后再点击下载，或者实际显示PDF请求已完成。任何解决方案？

Answer 1

要检查文件是否存在，用途：

BOOL exists = [[NSFileManager defaultManager] fileExistsAtPath:file] 

要显示PDF一旦请求完成后，您可以在UIWebView打开它，或者使用CGPDF*组函数来呈现它。

ASIHTTPRequest的setDownloadDestinationPath预计会收到一个绝对文件路径，而您似乎只是传递文档目录。 你可以从你的URL中的文件名，并追加到文件目录路径：

NSString *filename = [[url absoluteString] lastPathComponent]; 

NSString *directory = [NSSearchPathForDirectoriesInDomains(NSDocumentDirectory,NSUserDomainMask,YES) objectAtIndex:0]; 
NSString *destPath = [directory stringByAppendingPathComponent:filename]; 

[request setDownloadDestinationPath:destPath]; 

然后检查，如果下载的文件确实存在，可以再次使用destPath。

Answer 2

check this out，我做了它的图像，但你可以很容易地修改它做PDF。我希望它有帮助。