Swift variables not imported to Objective C

Question

I am using a Swift based project and have imported some Objective C files. Now I want my Swift code to work back in ObjC files. All goes well but unfortunately, Int, Float and Double attributes of classes are not available to Objective C class. Any idea why is this not being open to Objective C?

Swift Class:

class Station: NSObject, NSCoding {

    var Id : Int!
    var placeId : Int!
    var name : String!
    var stationDescription : String!
    var uuid : String!
    var major : Int?
    var minor : Int?
    var coordinates: CLLocationCoordinate2D!
    var geoFenceRadius : Float?
    var questions : [Question]?


    }

Swift-Interface Generated Class:

@interface Station : NSObject <NSCoding>
@property (nonatomic, copy) NSString * _Null_unspecified name;
@property (nonatomic, copy) NSString * _Null_unspecified stationDescription;
@property (nonatomic, copy) NSString * _Null_unspecified uuid;
@property (nonatomic, copy) NSArray<Question *> * _Nullable questions;
- (BOOL)isEqual:(id _Nullable)object;
- (nonnull instancetype)init OBJC_DESIGNATED_INITIALIZER;
- (nonnull instancetype)initWithCoder:(NSCoder * _Nonnull)aDecoder OBJC_DESIGNATED_INITIALIZER;
- (void)encodeWithCoder:(NSCoder * _Nonnull)aCoder;
+ (Station * _Nullable)stationWithDictionary:(NSDictionary<NSString *, id> * _Nonnull)dict placeUUID:(NSString * _Nullable)placeUUID;
+ (NSArray<Station *> * _Nullable)parseListFromDictionariesList:(NSArray<NSDictionary<NSString *, id> *> * _Nonnull)dicts placeUUID:(NSString * _Nullable)placeUUID;
@end

This is the error while Id of object is Accessed.

@Saad : Are you using `@objc` keyword before `class` in swift? — Poles, Jan 02 '17 at 10:47
Found the reason. Objective Don't has replacement for Int that's why not imported — Saad, Jan 02 '17 at 10:51
well used @Poles trick by adding objc with every var and says "cannot use Objc Because type of this variable cannot be represented in Objective C" While it worked with String. Now used NSNumber and worked — Saad, Jan 02 '17 at 10:58
Knew that only optionals are not imported but this case causing non-optionals as well — Saad, Jan 02 '17 at 10:58
@Saad: I do not think so. Remove the `!` in `Int!` and the `?` in `Float?` and watch the difference. – See also http://stackoverflow.com/questions/24221407/can-a-swift-optional-int-int-be-exposed-to-objective-c-via-bridging. — Martin R, Jan 02 '17 at 11:37

jvarela · Answer 1 · 2017-01-02T16:51:56.763

I just tried it and my ints are imported as NSInteger's (using Xcode 8.2.1 and Swift 3.0.1). Anyway, I think it is a bad idea to use Id as a variable name, for two reasons: 1) in Swift, you should use non-capitalized variable names; and 2) Id is very similar to an Obj-C reserved keyword id. Try to rename your variable to something like itemID. Also remove the ! after the variable names and initialized them with 0 like this:

class Station: NSObject, NSCoding {

var itemID : Int = 0
var placeId : Int = 0
var name : String!
var stationDescription : String!
var uuid : String!
var major : Int = 0
var minor : Int = 0
var coordinates: CLLocationCoordinate2D!
var geoFenceRadius : Float = 0.0
var questions : [Question]?


}

This is causing all your problems, as Martin pointed out earlier.

Swift variables not imported to Objective C

1 Answers1