GitHub - andrewschreiber/TextFlipKit: Easy flipping and reversing of strings on iOS

An NSString and NSAttributedString category that makes it easy to flip and reverse text. Flipped text can be sent in text messages, emails, etc.

##Usage

#import TextFlipKit.h;

- (void)foo
{
    NSString *example = @"Example String";
    NSLog(@"'%@'", example.tfk_upsideDownAndReversed);
    //Prints 'ƃuᴉɹʇS ǝldɯɐxƎ'. Looks normal upside down
    
    NSLog(@"'%@'",testString.tfk_upsideDown);
    //Prints 'Ǝxɐɯdlǝ Sʇɹᴉuƃ'
    
    NSLog(@"'%@'",testString.tfk_reversed);
    //Prints 'gnirtS elpmaxE'
}

Given a string of 100,000 characters, it takes ~0.1 second to flip upside down, ~0.3 seconds to reverse, and ~0.4 seconds to flip and reverse on an iPhone 6. Each function can be called as a block, in case you want to flip long strings off the main thread.

- (void)bar
{
    NSString *completedWorksOfShakespeare = [NSString stringWithContentsOfFile:completedWorks encoding:NSASCIIStringEncoding error:nil];
    [completedWorksOfShakespeare tfk_upsideDownAndReverseWithCompletionBlock:^(NSString *upsideDownAndReversed)
    {
        //Save to disk
    }
}

##Attributed Strings Flipped attributed strings maintain the attributes of each character.

##Requirements

• ARC
• iOS 4.0 or later

##Installation You can either add the TextFlipKit.h and TextFlipKit.m files directly to your project, or install via CocoaPods.

pod 'TextFlipKit', '~> 0.1.0'

##Special thanks @somegeekintn on StackOverflow

http://stackoverflow.com/questions/4158646/most-efficient-way-to-iterate-over-all-the-chars-in-an-nsstring