objective-c - objective-c : convert a NSMutableString in NSString

Question

我有一个 NSMutableString，如何将其转换为 NSString？

Answer 1

通过:

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，但是您可以将其转换为 NSString

NSString *immutableString = yourMutableString;

让它看起来不可变，尽管它实际上是可变的。
尽管声明返回不可变实例，但许多方法实际上返回可变实例。