Objective C - declaring optional field on property

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Is there any work around to set Bool and float types to Optional in objective c i couldn't find any?

 @property (nonatomic, assign) float percentageOfCases;
    @property (nonatomic, assign) float inspectionPercentageOfCases;
    @property (nonatomic, assign) NSString<Optional> *inspectionStatus;
@property (nonatomic, assign) BOOL sendNotification;
objective-c
1 Answers

Swift's Optional corresponds to nullability in Objective-C, and in Objective-C, only pointer types can be nullable. So you have to change your properties to be pointer types, which in this case means NSNumber * for the float properties and either NSNumber * or CFBooleanRef for the BOOL property.

However, changing the types will make Swift import the properties as NSNumber and CFBoolean instead of as Float and Bool. So you probably also want to apply NS_REFINED_FOR_SWIFT to each property, and a Swift extension to define properties of type Float and Bool. Here's what it looks like:

// In your Objective-C header:

@interface MyObject : NSObject
@property (nonatomic, assign, nullable) NSNumber *percentageOfCases NS_REFINED_FOR_SWIFT;
@property (nonatomic, assign, nullable) NSNumber *inspectionPercentageOfCases NS_REFINED_FOR_SWIFT;
@property (nonatomic, assign, nullable) NSString *inspectionStatus;
@property (nonatomic, assign, nullable) CFBooleanRef sendNotification NS_REFINED_FOR_SWIFT;
@end

extension MyObject {
    var percentageOfCases: Float? {
        get { __percentageOfCases?.floatValue }
        set { __percentageOfCases = newValue as NSNumber? }
    }

    var inspectionPercentageOfCases: Float? {
        get { __inspectionPercentageOfCases?.floatValue }
        set { __inspectionPercentageOfCases = newValue as NSNumber? }
    }

    var sendNotification: Bool? {
        get { (__sendNotification as NSNumber?)?.boolValue }
        set { __sendNotification = newValue as NSNumber? }
    }
}

Note that Xcode will not offer code completion for the double-underscored identifiers (like __percentageOfCases).

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