Ios NSData在从Pdf转换时得到说明

我正试图在Objective C中从iPhone中的iClouds上传pdf。以下是我的代码，点击会触发

UIDocumentPickerViewController *doc = [[UIDocumentPickerViewController alloc]initWithDocumentTypes:@[@"public.composite-content"] inMode:UIDocumentPickerModeImport];
doc.delegate = (id)self;
doc.modalPresentationStyle = UIModalPresentationFullScreen;
[self presentViewController:doc animated:YES completion:nil];//getting the path of the file selected through  didPickDocumentAtURL
NSString *path = [url path];//converting in to data in two different ways but getting truncated nsdata
NSData *data3 = [[NSFileManager defaultManager] contentsAtPath:path];//Truncating
NSData *data1 = [NSData dataWithContentsOfFile:path];//Truncating Both data3 and data1 are getting truncated after 32767 characters.

问题：

将.pdf导入

NSData

的格式正确吗

NSData

是否有任何限制？（我这样问是因为它在32767个字符之后被截断）

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我通过调用UIDocumentPickerViewController的委托方法解决了这个问题

  - (void)documentPicker:(UIDocumentPickerViewController *)controller didPickDocumentAtURL:(NSURL *)url{
                if (controller.documentPickerMode== UIDocumentPickerModeImport) {
                      //taking the path of the file selected
                       NSString *path = [url path];
                      //converting to NSData
                        NSData *data = [[NSFileManager defaultManager] contentsAtPath:path];
                       //converting to base64 string
                        base64String = [data base64EncodedStringWithOptions:kNilOptions];

                 }
     }

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实际问题/结果是什么？您希望得到什么？为什么不使用

CGPDFDocumentCreateWithURL

？要将pdf上载到服务器，我需要将pdf转换为base64字符串，因此我使用[data3 base64EncodedStringWithOptions:kNilOptions]将文件转换为数据，并将数据转换为base64字符串@PiyushPatel我是iOs家族的新手，到目前为止我还没有使用CGPDFDocumentCreateWithURL