NSMutableIndexSet *indexes = [NSMutableIndexSet indexSetWithIndexesInRange:NSMakeRange(0, self.presenter.dataSource.count)];
[self.dataCache insertObjects:self.presenter.dataSource atIndexes:indexes];
数组中的元素完全倒叙 ( reverse背面；相反)
NSMutableArray *array = [NSMutableArray arrayWithObjects:@"1",@"2",@"3",nil];
NSArray* reversedArray = [[array reverseObjectEnumerator] allObjects];
NSLog(@"reversedArray----%@",reversedArray);
2017-06-30 15:39:56.704 05-transform[9784:153184] reversedArray----(
3,
2,
1
)
