Put a nsmutablestring into a other nsmutablestring

Question

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?

Answer 1

NSMutableString继承自NSString，这意味着-setString:也可与可变字符串参数一起使用。

[mutableStringA setString:mutableStringB];