Chrome certificate error with self signed websites on Mac OS Catalina

Drag and drop self signed certificate onto desktop and import it into keychain. Double click on it and select “Always Trust”.


For further details, visit


SmartSVN – FileMerge as External Diff Tool

SmartSVN Preferences -> File Compare -> Add

File Pattern : *
External Diff Tool:
Command: /Applications/
Arguments: -left ${leftFile} -right ${rightFile}

Electron Main Window Communicate with Tray


ipcMain.on('main:progress:details', (event, value) => {
if (trayWindow && trayWindow.isVisible()) {
trayWindow.webContents.send('tray:progress:details', value);


ipc.on('tray:progress:details', (event, title, value) => {
// show to user

For more details, check the blog

Debug React Native Source Code with Breakpoints


  1. Install React Native Debugger tool
    • brew update && brew cask install react-native-debugger
    • brew cask reinstall react-native-debugger
  2. Quit Google Chrome if it already running.
  3. Launch the React Native Debugger app from Applications folder.
  4. Activate iOS simulator and Run command+d using keyboard. In the debug menu select “Debug JS Remotely” option.
  5. Go to React Native Debugger. Select ‘Toggle Developer Tools’ sub menu item from ‘View’ menu.
  6. Select Sources tab
  7. In the left side menu, expand RNDebuggerWorker.js and expand sub option localhost:****. You will see the project root folder.
  8. Select a .js file and add break point. Break point will get activated when the respective line is executed.
  9. You can see the console logs in the console area at the bottom.

React Native – “Unable to resolve module”

Do the following steps to cleanup

  • Quit and launch Terminal
  • rm -rf iOS/build
  • npm cache verify
  • watchman watch-del-all
  • rm -rf node_modules
  • rm -rf /tmp/metro-bundler-cache-*
  • rm -rf /tmp/haste-map-react-native-packager-*
  • rm -rf $TMPDIR/react-*
  • rm -rf $TMPDIR/haste-*
  • rm -rf $TMPDIR/metro-*
  • npm cache clean
  • npm install && react-native link && react-native run-ios


iOS: Create Password Protected Zip File


NSString *filePath = @"/Users//Desktop/uf/abc.txt";
NSString *zipFilePath = @"/Users//Desktop/uf/";
NSString *content = @"Contents to be stored";

NSError *error = nil;
BOOL isFileCreated = [content writeToFile:filePath atomically:YES encoding:NSASCIIStringEncoding error:&error];

if (isFileCreated)
    ZipArchive *zipArchive = [[ZipArchive alloc] init];
    BOOL isZipFileCreated = [zipArchive CreateZipFile2:zipFilePath Password:@"domle"];

    if (isZipFileCreated)
       BOOL isFileAddedToZip = [zipArchive addFileToZip:filePath newname:[filePath lastPathComponent]];
       NSLog(@"isFileAddedToZipFile %d", isFileAddedToZip);
       [zipArchive CloseZipFile2];



CNContactPickerViewController – UISearchBar looks black in colour and entered text not visible

Setting search bar background colour will fix the issue, but cancel button is not visible in edit mode due to cancel button text is in white colour. The cancel button will be visible when we set the tint colour for label.

  • [[UISearchBar appearance] setBackgroundColor:[UIColor whiteColor]];
  • [[UILabel appearanceWhenContainedInInstancesOfClasses:@[UISearchBar.class]] setTintColor:[UIColor blueButtonColor]];