NSArray Sort 排序

打算实现tableview的生序降序排序
```js
NSArray * rs= [oneArray sortedArrayUsingComparator:<sup>NSComparisonResult(RFIConModel</sup> * obj1, RFIConModel * obj2) {

    NSComparisonResult result=NSOrderedSame ;
    float obj1float=[obj1.imageWidth floatValue];
    float obj2float=[obj2.imageWidth floatValue];

    if (obj1float>obj2float) {
        result=NSOrderedAscending;
    } else if (obj1float==obj2float) {
        result= NSOrderedSame;
    } else  {
        result= NSOrderedDescending;
    }

    if (flag) {
        return result;

    }
    else
    {
        return [RFIConModel comResultRevert:result];

    }
    return result;
```