How to add percent sign to NSString

The code for percent sign in NSString format is %%. This is also true for NSLog() and printf() formats.

If that helps in some cases, it is possible to use the unicode character:

NSLog(@"Test percentage \uFF05");

The escape code for a percent sign is "%%", so your code would look like this

[NSString stringWithFormat:@"%d%%", someDigit];

Also, all the other format specifiers can be found at Conceptual Strings Articles

The accepted answer doesn't work for UILocalNotification. For some reason, %%%% (4 percent signs) or the unicode character '\uFF05' only work for this.

So to recap, when formatting your string you may use %%. However, if your string is part of a UILocalNotification, use %%%% or \uFF05.