目标C:在NSString中转换NSMutableString [英] Objective C: convert a NSMutableString in NSString

问题描述

我有一个NSMutableString，如何将其转换为NSString?

I have an NSMutableString, how can I convert it to an NSString?

推荐答案

通过以下方式之一

NSString *immutableString = [NSString stringWithString:yourMutableString];

或通过:

NSString *immutableString = [[yourMutableString copy] autorelease];
//Note that calling [foo copy] on a mutable object of which there exists an immutable variant
//such as NSMutableString, NSMutableArray, NSMutableDictionary from the Foundation framework
//is expected to return an immutable copy. For a mutable copy call [foo mutableCopy] instead.

作为NSString的子类，但是您可以将其强制转换为NSString

Being a subclass of NSString however you can just cast it to an NSString

NSString *immutableString = yourMutableString;

即使它实际上仍然可变，也使它看起来不可变.
尽管已声明要返回不可变的实例，但许多方法实际上仍返回可变的实例.

making it appear immutable, even though it in fact stays mutable.
Many methods actually return mutable instances despite being declared to return immutable ones.

这篇关于目标C:在NSString中转换NSMutableString的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！