去掉顶部titlebar

  guard let windowScene = (scene as? UIWindowScene) else { return }
  #if targetEnvironment(macCatalyst)
    if let titlebar = windowScene.titlebar {
         titlebar.titleVisibility = .hidden
         titlebar.toolbar = nil
     }
  #endif

禁止休眠

   CFStringRef reasonForActivity= CFSTR("Describe Activity Type");
    IOPMAssertionID assertionID;
    IOReturn success = IOPMAssertionCreateWithName(kIOPMAssertionTypeNoDisplaySleep,
                      kIOPMAssertionLevelOn, reasonForActivity, &assertionID);

读取本地图片

      NSArray *documentTypes = @[@"public.image"];
     UIDocumentPickerViewController *documentPicker = [[UIDocumentPickerViewController alloc] initWithDocumentTypes:documentTypes inMode:UIDocumentPickerModeOpen];
     
     documentPicker.delegate = self;
     
     documentPicker.modalPresentationStyle = UIModalPresentationFullScreen;
     
     [self presentViewController:documentPicker animated:YES completion:nil];