Objective-C: Check if using enum option

Question

I have a custom object that is using a typedef enum. If I set a few of the enum options for my object, how can I check to see if those are being used?

typedef e         


        

Answer 1

I'd suggest to define the enum using NS_OPTIONS. This is the Apple recommended way to create such enums.

typedef NS_OPTIONS(NSUInteger, Options) {
    Options1 = 1 << 0,
    Options2 = 1 << 1,
    Options3 = 1 << 2,
};

Then, as it has already been said, you can assign values by doing:

myObject.options = Option1 | Option2;

and check them:

if (myObject.options & Option1) {
    // Do something
}