尝试改变不可变对象错误 [英] Attempt to mutate immutable object error

问题描述

我的代码在此行崩溃:

[(NSMutableString *)string replaceCharactersInRange:range withString:@""];

尝试更改不可变对象时出错.

with the error attempt to mutate immutable object.

这是怎么回事，我该如何解决?

How is this happening and how do i fix it?

推荐答案

字符串不可变，强制转换不是魔术，也不能将其转换为可变字符串.您应该在可变副本上执行此操作:

The string isn't mutable, casting is not magic, it wouldn't turn it into a mutable string. You should do it on a mutable copy:

NSMutableString* mutableString= [string mutableCopy];
[mutableString replaceCharactersInRange:range withString:@""];

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