错误:“尝试使用appendString对不可变对象进行突变:"-

问题描述

我遇到一个错误尝试用appendString改变不可变对象:"

I am getting an error'Attempt to mutate immutable object with appendString:'

我的代码是

NSMutableString *resultString= [[NSMutableString alloc]init];


for (NSMutableString *s in self.ArrayValue)
{
    [resultString appendString:s];
    NSLog(resultString);

}

ArrayValue是NSMutableArray.
我不明白问题出在哪里

ArrayValue is NSMutableArray.
I am not able to understand where is the problem

先谢谢您

推荐答案

发布后，您拥有的代码不会给您所描述的错误.可能是在分配resultString和for循环之间的某个地方，您正在使用普通的NSSring覆盖它.

As posted, the code you have will not give you the error you describe. Probably, somewhere between allocating resultString and the for loop, you are overwriting it with a normal NSSring.

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