Roughly about 1 of 2 Swiss francs is won abroad.
So, yes it is easier for Swiss companies to export when the Swiss franc is not "too high" as it has been those last years.
The main export market for Switzerland is the UE.
Some companies are doing most or all of their business on the Swiss market. Others are much more exposed to the the health of the global economy.
When the Swiss franc appreciates, some companies suffer a lot from that and other less. It depends on their product portfolio, competitors, and other factors.
The last decades have shown that how the Swiss Franc valuation is less and less correlated with the performance of the Swiss economy.
The Swiss franc is used as a safe haven when the global economy goes bad or is uncertain. In those times, the Swiss franc can be overevaluated, at least as compared to the purchasing power.
When the global economy is improving, the over-appreciation of the Swiss franc tends to disapear ; this is happening now (in Mid-2017).
As a summary, the Swiss franc itself is not truly correlated with the competitiveness of the Swiss economy, but more about how people in the world are anxious. In this regard, it behaves a little bit like gold.