iPhone app launch times and Core Data migration

Question

I have a Core Data application which I plan to update with a new schema. The lightweight migration seems to work, but it takes time proportional to the amount of data in the dat

Answer 1

I just found a pretty simple approach. Just wrap all your calls in application:didFinishLaunching with a dispatch_async to the main thread. This will return right away and let you perform your upgrade on the main thread. However, you should probably set your window so that it doesn't display a blank screen while migrating.

- (void)application:didFinishLaunching {
     dispatch_async(main_queue) {
          // migration
     }
     self.window = ...
     return YES;
}