Reverse NSString text

Question

I have been googling so much on how to do this, but how would I reverse a NSString? Ex:hi would become: ih

I am looking for the easiest way to do this.

Thanks!

@Vince I made this method:

- (IBAction)doneKeyboard {

// first retrieve the text of textField1
NSString *myString = field1.text;
NSMutableString *reversedString = [NSMutableString string];
NSUInteger charIndex = 0;
while(myString && charIndex < [myString length]) {
    NSRange subStrRange = NSMakeRange(charIndex, 1);
    [reversedString appendString:[myString substringWithRange:subStrRange]];
    charIndex++;
}
// reversedString is reversed, or empty if myString was nil
field2.text = reversedString;
}

I hooked up that method to textfield1's didendonexit. When I click the done button, it doesn't reverse the text, the UILabel just shows the UITextField's text that I entered. What is wrong?

Answer 1

Block version.

NSString *myString = @"abcdefghijklmnopqrstuvwxyz";
NSMutableString *reversedString = [NSMutableString stringWithCapacity:[myString length]];

[myString enumerateSubstringsInRange:NSMakeRange(0,[myString length]) 
                             options:(NSStringEnumerationReverse | NSStringEnumerationByComposedCharacterSequences)
                          usingBlock:^(NSString *substring, NSRange substringRange, NSRange enclosingRange, BOOL *stop) {
                            [reversedString appendString:substring];
                        }];

// reversedString is now zyxwvutsrqponmlkjihgfedcba