In Objective-C, there are a few ways to increment a number. Here are some examples:
1. Using the unary operator "++"
``objective-c
int num = 5;
num++; // num is now 6
2. Using the increment operator as a postfix
objective-c
int num = 5;
num = num + 1; // num is now 6
3. Using the increment operator as a prefix
int num = 5;
++num; // num is now 6
``
All of these examples achieve the same result of incrementing the value of the variable "num" by 1.