Question

[NSString stringWithFormat:@"%@ \n%@ \n%@",
 self.message1,self.message2,self.message3];

There’s a way to pass only message1 ..2 ..3 only if not == “” ?

Answer 1

Just to suggest an alternative and more compact solution:

[[@[self.message1, self.message2, self.message3]
    filteredArrayUsingPredicate:[NSPredicate predicateWithFormat:@"length > 0"]]
            componentsJoinedByString:@" \n"];

So unlike Mundi’s solution that:

1. creates an array of all strings that may be used;
2. creates a predicate that differentiates between strings you want and strings you don’t want;
3. creates a second array by filtering the first using the predicate;
4. asks for all items in the second array to be glued together with a string and a newline in between.

There are obviously more steps in there so it’ll cost a bit more but for most purposes you really don’t need to care about that nickel and dime stuff.