using objective c enum in swift

 

 

 

 

I have an enum defined in Objective C and used as a datatype in a Swift object.I know its possible to use Swift enums in Obj C with objc prepending it but I dont have much control over this enum since its auto generated from existing Objective C code. This means that the prefixes to enumeration value names are truncated when they are imported into Swift, whether theyre defined in system frameworks or in custom code. This means its a one way street - you can use Objective-C enums in Swift but not the other way around. Swift enums can now be exported to Objective-C using the objc attribute. objc enums must declare an integer raw type, and cannot be generic or use associated values. Because Objective-C enums are not namespaced, enum cases are imported into From what I can tell, UMSocialSNSType was declared in Objective-C without using the NSENUM macro, so it wasnt imported as a Swift enum.It looks like the Swift-version of the bridged typedefenum must be something like Im calling an Objective-C method in my swift 2.3 code in Xcode 8.2 (build target 8.0). It accepts an NS ENUM as a parameter LessonConvertToMultipleChoiceOperation.swift:55:64: Static member QA cannot be used on instance of type MLCMultipleChoiceSlideSubtype. Im calling an Objective-C method in my swift 2.3 code in Xcode 8.2 (build target 8.0). It accepts an NS ENUM as a parameter LessonConvertToMultipleChoiceOperation.swift:55:64: Static member QA cannot be used on instance of type MLCMultipleChoiceSlideSubtype. In my project, I have Swift extensions on Objectives C enums, which worked brilliantly in Xcode 7.2.I have an enum in my Swift class and a declared variable. I need to encode and decode it using NSCoder .

We will start this article by taking a look how enums work in Objective-C. Then well move to Swift, first looking at basic use cases, then diving into some more exciting examples of leveraging enums in Swift. It cant be done in Swift older version than 1.2. But according to this official Swift Blog. In Swift 1.2 that released along with XCode 6.3, You can use Swift Enum in Objective-C by adding objc in front of enum. Enums are much more powerful in Swift than they are in other languages, such as C or Objective-C.

As youve seen, you can extend them, create custom initializer methods, provide namespaces and encapsulate related operations. So far youve used enum to model CSS colors. In any case, I encountered this, when working on importing a large Objective-C SDK that I wrote into Swift. Everything works great. Until I try to do comparisons on enums declared in C. Obviously, C enums are not turned into Swift enums, but I am having trouble figuring out how to use them. Unfortunately an enum is not transferrable to Swift from Objective-C, it needs to be an NS ENUM. I have the same setup as you in a project where I need the enum from an Objective-C framework and use it in Swift. Swift removes as many letters as possible that the enum values have in common with the enumeration name. In your case, with an enumeration called countDirection and a value countDirectionUp, the whole "countDirection" is removed. Its not needed because you know which enum you are using Xcode generates a header file for all your Swift code in the project, so you can use it in Objective-C.— Apple. So they can be classes, structs, protocols, enums, functions, variables and so on. Im calling an Objective-C method in my swift 2.3 code in Xcode 8.2 (build target 8.0). It accepts an NS ENUM as a parameter: Typedef NSENUM(NSUInteger, MLCMultipleChoiceSlideSubtype) MLCMultipleChoiceSlideSubtypeQA, MLCMultipleChoiceSlideSubtypeFillInTheBlank Apparently bridging array of enum values to Objective C is no longer possible in Swift 4, not even using objc annotationAn Int enum bridged to Objective-C is turned into an Objective-C enum. | Recommendios - Using NSENUM from Objective-C in Swift. edef NSENUM(NSUInteger, RJBEvent) RJBEVENTOK 1, RJBEVENTERROR2, RJBEVENTSTART 4, Then in Objective-C, I can do the following And some other Obj-C classes still using enum in that converted class.Enumerations are a really handy tool in Objective-C and in Swift, enums provide a lot more features. The case for using enumerations is clear, you want to define a How to enumerate over enum in Objective-C? [duplicate].I am using the wahoo fitness API (which is in objective-c) in my swift app. I am trying to combine bitwise multiple items from an enum which is not an NSENUM. Swift bridge automatically got rid of prefix MyEnumType from the Objective Cs enum and provided a convinient way to use them. So the enums can be used like this in a switch statement It has an Objective-C enum like this: typedef enum : NSInteger NotReachable 0, ReachableViaWiFi, ReachableViaWWAN NetworkStatus Email codedump link for Error using Objective C typedef enum in Swift 3. Ive already done this for other swift libraries, so things like the Obj- C Generated Interface Header are already present. This is the class I wish to useObjective-C cannot see a Swift enum at all. In Swift, an enum is an object type. Summary: Using an Objective-C enum (backed by NSUInteger) in Swift is not working. Xcode shows any swift property of the type of this enum as it has no values defined ( a case of the enum) . See image attachments and test project that you can run. case Slide. Starting in Swift 1.2, the bridge can be crossed in the other direction: a Swift enum with an Int raw value type can be exposed to Objective-C using the objc attribute. Thus, for example Enums Interoperability between Objective-C and Swift.Use of a lens not NSENUM-C enum swift. I am using the wahoo fitness API and it defines the following objective-C enum: typedef enum / No active connection. iosHow should a Swift Objective-C project be setup for Unit Testing 2015-06-22.cWhat is a typedef enum in Objective-C 2015-06-24. I dont think I fundamentally understand what an enum is, and when to use it. Objective C is an object-oriented programming language. It is powerful, flexible and can be used to develop outstanding apps.Similarly, a variable that is declared with the enum type will not be able to take a value outside the predefined enumerator. To learn more about data types in Objective C, you Using Swift enums nicely addresses these complaints. A Swifty Enum Error.What About Objective-C Compatibility? Unfortunately, Swift enums cant export to Objective-C. However, the objective C code cannot use all the new features of Swift, such as Swift struct and enum Thus, until the full porting of the application to Swift is not done, it wont be able to make full use of Swifts features. As part of its interoperability with Objective-C, Swift maintains compatibility with a number of C language types and features.Use NSTYPEDENUM for sets of values that cant logically have values added in a Swift extension. Objective-C cannot see a Swift enum at all. In Swift, an enum is an object type. Objective-C has no knowledge whatever of any such object type its only objects are classes.Leave a reply to - Using Swift Class and Enum from Objective-C. How can I use that Objective-C enum in Swift?This is an "ordinary" C enum. So it arrives into Swift with no namespacing the names NotReachable, ReachableViaWiFi, and ReachableViaWWAN can be used directly. Unfortunately an enum is not transferrable to Swift from Objective-C, it needs to be an NS ENUM. I have the same setup as you in a project where I need the enum from an Objective-C framework and use it in Swift. If someone tries to use an invalid numerical value, the compiler wont warn you and your code will fail at runtime. Its important to note that, unlike C or Objective-C enums, Swift enums declared in the above fashion are not equivalent to integers: North is not an alias for 0, and so forth. This question already has an answer here:Swift and comparing C typedef enums1 answerI have 2 enum definition in Objective-C file and Swift file.JapaneIs this a bug of Swift? And how can I use Objective-C (C) enum in Swift file? When and how to use enums in Swift? This is a detailed practical overview of all the possibilities enums can offer you.Integer-based enums such as enum Bit: Int case Zero 0 case One 1 can be bridged to Objective-c via the objc flag. Im calling an Objective-C method in my swift 2.3 code in Xcode 8.2 (build target 8.0). It accepts an NS ENUM as a parameter: typedefLessonConvertToMultipleChoiceOperation.swift:55:64: Static member QA cannot be used on instance of type MLCMultipleChoiceSlideSubtype I have no idea Use static string from objective c in swift.

The static keyword, when used with a global, limits the scope of the variable to the current .m file. Its generally used when defining a constant used within a particular .m file, but not to be referenced elsewhere. Enumerations are a really handy tool in Objective-C and in Swift, enums provide a lot more features. The case for using enumerations is clear, you want to define a readable way to name options that you can use throughout your code instead of string constants or plain numbers. Im calling an Objective-C method in my swift 2.3 code in Xcode 8.2 (build target 8.0). It accepts an NS ENUM as a parameter: Typedef NSENUM(NSUInteger, MLCMultipleChoiceSlideSubtype) MLCMultipleChoiceSlideSubtypeQA, MLCMultipleChoiceSlideSubtypeFillInTheBlank Is it possible to use Swifts Enum in Obj-C?I need to be able to call this from my existing Objective-C class, but whenever I put the ENUM in the Swift function arguments, Objective-C cant find that specific function (it is even removed from the "- Swift.h" file. Ive already done this for other swift libraries, so things like the Obj- C Generated Interface Header are already present. This is the class I wish to useObjective-C cannot see a Swift enum at all. In Swift, an enum is an object type. The simplest workaround is redefining your C enum as: Typedef NSENUM(NSUInteger, JapaneseFoodType) JapaneseFoodTypeSushi 1, JapaneseFoodTypeTempura 2, Which will allow LLVM to process the enum and convert it to a Swift enum (NSENUM also improves your Im working with the Facebook Objective-C SDK in Swift and Im trying to compare an FBSessionState value with a value from the enum.I changed all the Facebook enums to use the NSENUM macro, so that you can use Swift syntax the enums. if FBSession.activeSession().state Swift Language Enhancements. Swift enums can now be exported to Objective-C using the objc attribute. objc enums must declare an integer raw type, and cannot be generic or use associated values. Unfortunately an enum is not transferrable to Swift from Objective-C, it needs to be an NS ENUM. I have the same setup as you in a project where I need the enum from an Objective-C framework and use it in Swift. How can I use that Objective-C enum in Swift?This is an "ordinary" C enum. So it arrives into Swift with no namespacing the names NotReachable, ReachableViaWiFi, and ReachableViaWWAN can be used directly. Summary: I have the following enum in an objective C file: typedef NS ENUM(NSInteger, countDirection) countDirectionUp 0, countDirectionDown How can I use this in a swift view controller? So, no, you cant use a Swift enum in an Objective-C class. THIS ANSWER IS NO LONGER VALID!! since Xcode 6.3 / Swift 1.2, Swift enums can also be used within objective-c using objc as DanielGalasko pointed out in his answer below!!! Im working with the Facebook Objective-C SDK in Swift and Im trying to compare an FBSessionState value with a value from the enum.I changed all the Facebook enums to use the NSENUM macro, so that you can use Swift syntax the enums.

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