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SomnusLee
SomnusLee

Reputation: 431

How to use NS_OPTIONS defined in Obj-C class in Swift

I have to use an Objective-C static library in my Swift project. Anything else goes well but the NS_OPTIONS enum defined in the Objective-C header file, like this:

#import <Foundation/Foundation.h>

typedef NS_OPTIONS(NSUInteger, MyOption) {
    MyOptionNone   = 0,
    MyOptionTop    = 1 << 0,
    MyOptionLeft   = 1 << 1,
    MyOptionBottom = 1 << 2,
    MyOptionRight  = 1 << 3
};

@interface MyObjcClass : NSObject

@end

and then in the .swift file, how could I use this enum in a switch-case?

EDIT: I use MyOption in my Swift class:

let option1: MyOption = .Top
let option2: MyOption = .Bottom
let value = option1 & option2

then I get compile error:

Binary operator '&' cannot be applied to two `MyOption` operands

How to solve this problem?

Upvotes: 2

Views: 3254

Answers (1)

rob mayoff
rob mayoff

Reputation: 385860

First, you need to fix your syntax. You need a semicolon after the closing brace:

typedef NS_OPTIONS(NSUInteger, MyOption) {
    MyOptionNone   = 0,
    MyOptionTop    = 1 << 0,
    MyOptionLeft   = 1 << 1,
    MyOptionBottom = 1 << 2,
    MyOptionRight  = 1 << 3
};

Next, in your bridging header, you need to import the header file that defines MyOption. When you first create a Swift source file to an Objective-C project, or when you first create an Objective-C source file in a Swift project, Xcode offers to create the bridging header for you. It's named ProjectName-Bridging-Header.h. So for example:

bridging header

Once you've done this, and both header files can be compiled without errors, you can use MyOption from Swift. It's an OptionSetType. Example:

MyOption usage

Upvotes: 11

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