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]; 
        } 

我无法通过点击再次下载之前检查文件是否存在，或者实际显示请求已完成的pdf。任何解决方案吗？

Answer 1

要检查文件是否存在，请使用：

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

要在请求完成后显示PDF，您可以在UIWebView中打开它，也可以使用CGPDF*一组功能进行渲染。

ASIHTTPRequest的setDownloadDestinationPath期望接收绝对文件路径，而您似乎只是传递文档目录。 您可以从URL获取文件名并将其附加到文档目录路径：

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

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

[request setDownloadDestinationPath:destPath];

然后，要检查下载的文件是否确实存在，您可以再次使用destPath。

Answer 2

check this out，我是为图像制作的，但您可以轻松地将其修改为PDF。我希望它有所帮助。