Question

I’m trying to write a method in objc with a parameter that takes optional numer of types. Like the autorezise property for UIView. Or this one:

[[UIApplication sharedApplication] registerForRemoteNotificationTypes:(UIRemoteNotificationTypeAlert | UIRemoteNotificationTypeBadge | UIRemoteNotificationTypeSound)];

Example:

[object call:(TypeOne | TypeTwo | TypeThree)]; 

My guess is to define a method that takes a enum type like this:

- (void)call:(EnumType)type;

But then i have no idea how to act on the “type”. Can i use an if statement?

Answer 1

it’s declared as

typedef enum {
   UIRemoteNotificationTypeNone    = 0,
   UIRemoteNotificationTypeBadge   = 1 << 0,
   UIRemoteNotificationTypeSound   = 1 << 1,
   UIRemoteNotificationTypeAlert   = 1 << 2
} UIRemoteNotificationType;

there is an associated type. therefore, yes - (void)call:(EnumType)type; is correct.

to act on it: enum types behave like an int in many ways. you can if, compare, switch, and so on.