Please solve the programming task below using a self-contained code snippet in a markdown code block.

Given an array of integers nums, sort the array in increasing order based on the frequency of the values. If multiple values have the same frequency, sort them in decreasing order.
Return the sorted array.
 
Please complete the following python code precisely:
```python
class Solution:
    def frequencySort(self, nums: List[int]) -> List[int]:
```