How to add percent sign in string format? [duplicate]
write % twice:
rate = 99.99
let str = String(format: "%.2f%%", rate)
The % symbol has a special use in a printf statement. How would you place this character as part of the output on the screen?
You can do this by using %% in the printf statement. For example, you can write printf(“10%%”) to have the output appear as 10% on the screen.
Hope it help you :)