iPhone：基于数字排序时崩溃

我有一个NSArray输出。请参阅下文。我想根据其中的特定数字字段（顺序）进行排序。请参考下面的代码

Log: resultArray:
(
        {
        Name = "Myname1";
        Id = "dummyID";
        Order = 0; 
        parexId = 15;
        "__type" = "Question:#myAPI";
    },
        {
        Name = "Myname2";
        Id = "fatID";
        Order = 1; 
        parexId = 16;
        "__type" = "Question:#myAPI";
    }
        {
        Name = "Myname3";
        Id = "colorID";
        Order = 2; 
        parexId = 17;
        "__type" = "Question:#myAPI";
    }

)

代码：

但在排序过程中发生比较时，它会崩溃。 崩溃错误：

-[__NSCFNumber compare:options:]: unrecognized selector sent to instance 0x6b514b0

谁能帮帮我，我做错了什么

---

谢谢大家!

像下面这样使用它会很好

NSSortDescriptor *aSortDescriptor = [[NSSortDescriptor alloc] initWithKey:@"Order" ascending:YES];
    [resultArray sortUsingDescriptors:[NSArray arrayWithObject:aSortDescriptor]];
    [aSortDescriptor release];

---

订单是一个数字字段。它没有方法比较：选项。你应该使用

---

[obj1比较：obj2]

它给出编译错误，因为“Receiver type NSArray for instance message未声明具有选择器arrayWithObject的方法”resultArray应为NSMutableArray

NSSortDescriptor *aSortDescriptor = [[NSSortDescriptor alloc] initWithKey:@"Order" ascending:YES];
    [resultArray sortUsingDescriptors:[NSArray arrayWithObject:aSortDescriptor]];
    [aSortDescriptor release];