Question

我有一个NSArray输出。请参考下文。我想根据其中的特定数字字段（Order）进行排序。请参考以下代码。

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：

NSSortDescriptor *descriptor = [NSSortDescriptor sortDescriptorWithKey:@"Order" ascending:YES comparator:^(id obj1, id obj2) { 
            return [obj1 compare:obj2 options:NSNumericSearch]; 
    }];
    resultArray = [resultArray sortedArrayUsingDescriptors:[NSArray arrayWithObject:descriptor]]; // resultArray contents the above output values.

但是在排序过程中比较时会崩溃。崩溃错误：

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

有人可以帮助我，我在这里做错了吗？

谢谢！

Answer 1

订单是一个数字字段。它没有方法比较：选项。你应该使用

[obj1 compare：obj2];

Answer 2

使用如下，它将正常工作

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

iPhone：基于数字排序时崩溃

2 个答案: