If I have a nsmutablestring, I can set his string with the method setString. But this method only takes NSString, How I can put a nsmutablestring into my nsmutableString. If I do this: mutableStringA = mutableStringB, this will change the pointer of mutableStringA and not his string value, is it true?
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NSMutableString inherits from NSString, that means
-setString:also works with a mutable string argument.