数组进行倒序排列

_lightArray=[NSMutableArray arrayWithObjects:@"粮油",@"食用油",@"大米",@"杂粮",@"面粉面条", nil];

self.lightArray=(NSMutableArray*)[[self.lightArrayreverseObjectEnumerator]allObjects];

输出结果:@"面粉面条",@"杂粮",@"大米",@"食用油",@"粮油"