Question

我正在创建一个从在线服务器下载文件并将其保存到App的本地内存的应用程序。现在，我想要做的是当您单击“查看PDF”按钮时，它将直接打开PDF文件到iBooks。

这是我保存文件的代码：

        currentURL = @"http://weblink.com/folder1/folder2/file.pdf";
        NSURLRequest *request = [NSURLRequest requestWithURL:[NSURL URLWithString:currentURL]];

        NSURLConnection *conn = [[NSURLConnection alloc] init];
    (void)[conn initWithRequest:request delegate:self];

    dispatch_queue_t queue = dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_HIGH, 0ul);
    dispatch_async(queue, ^{
        data = [NSData dataWithContentsOfURL:[NSURL URLWithString:currentURL]];
        dispatch_sync(dispatch_get_main_queue(), ^{
        });
        resourceDocPath = [[NSString alloc] initWithString:[[[[NSBundle mainBundle]  resourcePath] stringByDeletingLastPathComponent] stringByAppendingPathComponent:@"Documents"]];

        filePath = [resourceDocPath stringByAppendingPathComponent:@"myPDF.pdf"];
        [data writeToFile:filePath atomically:YES];
    });

以下是我从互联网上找到的将文件打开到iBooks的内容（我点击按钮点击此代码）：

    NSString *path = [[NSBundle mainBundle] pathForResource:@"myPDF" ofType:@"pdf"];
    NSURL *url = [NSURL fileURLWithPath:path];
    UIDocumentInteractionController *docController = [[UIDocumentInteractionController alloc] init];

    docController = [UIDocumentInteractionController interactionControllerWithURL:url];
    docController.delegate = self;

该应用程序崩溃了该代码和此消息：

*** Terminating app due to uncaught exception 'NSInvalidArgumentException', reason: '*** -[NSURL initFileURLWithPath:]: nil string parameter'

Answer 1

在您阅读时使用路径写入时比较filePath。它们看起来与我不同，所以你可能在按钮点击代码中有一个无效/零参考。

Answer 2

尝试将pdf保存到文档文件夹

- (NSString *)applicationDocumentsDirectory
{
    return [NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES) lastObject];
}

//在你的街区内

filePath = [[self applicationDocumentsDirectory] stringByAppendingPathComponent:@"myPDF.pdf"];
NSLog(@"PDF path: %@",filePath);
[data writeToFile:filePath atomically:YES];

要在iBooks用户UIDocumentInteractionController中打开pdf，请参阅this获取教程。

Answer 3

[[UIApplication sharedApplication] openURL:[NSURL URLWithString:[NSString stringWithFormat:@"itms-bookss://%@",self.pathToFile]]];

这确实打开了本地pdf到Ibooks。＆＃39; ITMS-bookss＆＃39;不是'itms-books＆＃39;如果它已经位于您的Ibooks应用程序中。

另外，看起来将文件添加到iBooks就是使用不太可自定义的UIDocumentInteractionController。

目标C：下载PDF并在iBooks中打开

3 个答案: