Is there a simple way to split a NSString into an array of characters?

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You could do something like this (if you want to use enumerators)

NSString *fooString = @"Hello";
NSMutableArray *characters = [[NSMutableArray alloc] initWithCapacity:[fooString length]]; 

[fooString enumerateSubstringsInRange:NSMakeRange(0, fooString.length)
                              options:NSStringEnumerationByComposedCharacterSequences
                           usingBlock:^(NSString *substring, NSRange substringRange, NSRange enclosingRange, BOOL *stop) {
    [characters addObject:substring];
}];

And if you really wanted it in an NSArray finally

NSArray *fooChars = [NSArray arrayWithArray:characters];

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