How to initialise UIDocumentPickerViewController with all type of UTIs

Question

I want to open UIDocumentPickerViewController and It should allow user to select all type of files. I tried to mention all UTIs in UIDocumentPickerViewController init method sti

Answer 1

UIDocumentPickerViewController* documentPicker = 
  [[UIDocumentPickerViewController alloc] initWithDocumentTypes:@[@"public.item"]
                                                         inMode:UIDocumentPickerModeImport];