SNB commented on exchange rate in its latest Quarterly Bulletin. Here are the quotes from section 5.4.
Swiss franc gains against US dollar
Since the monetary policy assessment in December 2017, the Swiss franc has gained in value against the US dollar by around 4% (cf. chart 5.4). This appreciation occurred against a backdrop of general US dollar weakness, which became more pronounced at the end of January following statements by the US Treasury Secretary about the advantages of a weak US dollar for the American economy. At times, the USD/CHF exchange rate declined to its lowest level since mid-2015. 
Fluctuations in Swiss franc exchange rate to euro
Initially, the Swiss franc depreciated somewhat against the euro. At times in mid-January, the price of the euro was CHF 1.18, the highest value since the discontinuation of the minimum exchange rate. Thereafter, however, the Swiss franc strengthened again. This appreciation occurred against a backdrop of growing market uncertainty, which was also reflected in share price performance. In mid-March, one euro cost CHF 1.17, which was practically the same level as at the time of the monetary policy assessment in December.
Slight increase in Swiss franc’s trade-weighted external value
On a nominal trade-weighted basis, the Swiss franc has increased by more than 1% since mid-December (cf. chart 5.5). This was mainly due to its marked appreciation against the US dollar.
Real external value of Swiss franc still at a high level
Since autumn 2017, the real trade-weighted exchange rate index calculated by the SNB has been at roughly the same level as before the discontinuation of the minimum exchange rate. It thereby remains above its long-term average. The same is true for the indices calculated by the Bank for International Settlements (BIS) and the International Monetary Fund (IMF) (cf. chart 5.6).
Basically, there is no indication for a change of SNB’s stance on exchange rate. Swiss Franc remains overvalued. And it will stand ready to intervenue if needed.
