Simple alert view for Watch OS2 in Objective-C

alert.h

WKAlertAction *action = [WKAlertAction actionWithTitle:@"OK" style:WKAlertActionStyleDefault handler:^{
  // do something after OK is clicked
}];

[self presentAlertControllerWithTitle:@"Oops!" message:@"Something happened." preferredStyle:WKAlertControllerStyleAlert actions:@[action]];