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number % 2

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[self transitionFromViewController: toViewController: duration: options: animations: completion];

self.view.transform = xxx

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http://placehold.it/120x100

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[UIView transitionFromView:self.view toView:listsViewController.view
                  duration:1 options:UIViewAnimationOptionTransitionFlipFromRight
                completion:^(BOOL finished) {
                    [[UIApplication sharedApplication].delegate window].rootViewController = listsViewController;
                }];

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- (void)applicationDidBecomeActive:(UIApplication *)application
{
    application.applicationIconBadgeNumber = 0;
}

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NSObject
Sending Messages
– performSelector:withObject:afterDelay:
– performSelector:withObject:afterDelay:inModes:
– performSelectorOnMainThread:withObject:waitUntilDone:
– performSelectorOnMainThread:withObject:waitUntilDone:modes:
– performSelector:onThread:withObject:waitUntilDone:
– performSelector:onThread:withObject:waitUntilDone:modes:
– performSelectorInBackground:withObject:
+ cancelPreviousPerformRequestsWithTarget:

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*.app
build/
.DS_Store
*~
.LSOverride
*.xcuserdatad
*.xcworkspace

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git rm --cached ProjectFolder.xcodeproj/project.xcworkspace/xcuserdata/myUserName.xcuserdatad/UserInterfaceState.xcuserstate
git commit -m "Removed file that shouldn't be tracked"

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NSDate* now = [NSDate date];
NSDateComponents* ageComponents = [[NSCalendar currentCalendar]
                                   components:NSYearCalendarUnit
                                   fromDate:self.birthday
                                   toDate:now
                                   options:0];
NSInteger age = [ageComponents year];

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@synchronized(self) {
  // Code here will be execute by only one thread.
}