NSArray Sort 排序

打算实现tableview的生序降序排序

```js

NSArray * rs= [oneArray sortedArrayUsingComparator:NSComparisonResult(RFIConModel * 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;
```