iphone - 用空字符串替换数组对象时出错

Question

当 NSMutableArray 中的两个在索引 0 处具有相同值时出现不可预测的错误，然后我想删除该对象并用空字符串替换对象。但是应用程序崩溃说

 -[__NSArrayI replaceObjectAtIndex:withObject:]: unrecognized selector sent to instance 0xe2a06b0
  2012-03-22 14:36:48.181 golf eScorer[3849:11f03] *** Terminating app due to uncaught exception  
  'NSInvalidArgumentException', reason: '-[__NSArrayI replaceObjectAtIndex:withObject:]: 
   unrecognized selector sent to instance 0xe2a06b0'  

当我使用断点调试而不是日志显示时

2012-03-22 14:36:44.548 golf eScorer[3849:11f03] ArrayOfGameidOfPlayerToRemove....(
2
)
2012-03-22 14:36:44.549 golf eScorer[3849:11f03] discardedId...(
2
)

这是我的代码行:

 if([[ArrayOfGameidOfPlayerToRemove objectAtIndex:0] isEqualToString:[discardedId 
    objectAtIndex:0]])
        {
            [ArrayOfGameidOfPlayerToRemove replaceObjectAtIndex:0 withObject:emptyString];
        }

更新:

我是这样解决的

   NSMutableArray *ArrayOfGameidOfPlayerToRemove = [yournsarray mutableCopy];

Answer 1

似乎变量 ArrayOfGameidOfPlayerToRemove 是 NSArray 的实例。您只能在 NSMutableArray

中替换对象