一、倒序排列
//倒过来排序:
NSArray *arr = @[@"1", @"2", @"3"];
arr = [[arr reverseObjectEnumerator] allObjects];
NSMutableArray *accountArr = [[NSMutableArray alloc]initWithArray:arr];
accountArr = [[accountArr reverseObjectEnumerator] allObjects];
NSLog(@"arr = %@,accountArr = %@",arr,accountArr);
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