+ [NSString stringWithString：] - 什么是点？ [英] +[NSString stringWithString:] -- what's the point?
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问题描述
由于 NSString 字符串不可变， stringWithString：类方法的值是什么？
As NSString strings are immutable, what is the value of the stringWithString: class method?
我在使用 NSMutableString 时获得该实用程序，我没有看到该实用程序与 NSString
I get the utility when used with NSMutableString, I just didn't see the utility with the NSString class.
推荐答案
您可能有一个NSMutableString（或一些自制的NSString子类）想要复制。
You might have a NSMutableString (or some home-grown NSString subclass) that you want to duplicate.
NSMutableString *buffer = [NSMutableString string];
// do something with buffer
NSString *immutableStringToKeepAround = [NSString stringWithString:buffer];
当然，您也可以复制一份：
Of course, you can also just make a copy:
NSMutableString *buffer = [NSMutableString string];
// do something with buffer
NSString *immutableStringToKeepAround = [[buffer copy] autorelease];
但您拥有该副本，必须发布或自动发布。
but you own the copy and must release or autorelease it.
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