It is all to do with the recent court case to try to close down the current government, which the Government won. A lot of international companies were holding back on investing in Turkey until the outcome of the case. Now billions of foreign currency is being invested in Turkey in many different ways, which is making the Lira strong. However, Turkish business experts predict that it will fall again sometime in the not too distant future as Tukey has a huge defecit in its balance of payments and will need to borrow more money to make up for what it will lose in lost tourist revenue due to the strong Lira.
Hope this helps