The reason the variable are not showing is due to no format specifiers. I'm also surprised you didn't receive compiler warnings or errors with the above code.
This line of code:
username.text = [NSString stringWithFormat:@"Usuari: ", _usuari];
Should be written, like this - not so?
username.text = [NSString stringWithFormat:@"Usuari:%@ ", _usuari];
As _usuari
is the variable and the %@
is the format specifier, of where you want to place that variable.
After this: ursername.text
should print out like so: Usuari: variable value