How to save information ( Swift application )

I am developing an iOS application which generate random inspirational quote every day. At the moment when I close the app, open it again and click on the button which generates the daily quote, it shows me a new one.

Can you help me, how can I save the same quote all over the day and when the day is over generate a new quote. I mean at 00:00 o'clock in the morning.

I want to keep 1 quote per day, not 1 quote for every time I open the app.