我正在重写,我正处于将我的 Core Data 模型转换为 Swift 的阶段。其中一个模型 PointOfInterest
包含一个名为 types 的 enum
,用于识别对象的 PointOfInterest
类型是:
@class Port;
@interface PointOfInterest : NSManagedObject
enum types {
kGeneral,
kRestaurant,
kTypeCount
};
@property (nonatomic, retain) NSNumber * averageRating;
@property (nonatomic, retain) NSString * city;
@property (nonatomic, retain) NSString * countryName;
@property (nonatomic, retain) NSNumber * id;
@property (nonatomic, retain) NSString * imageURL;
@property (nonatomic, retain) NSNumber * latitude;
@property (nonatomic, retain) NSNumber * longitude;
@property (nonatomic, retain) NSString * name;
@property (nonatomic, retain) NSString * phone;
@property (nonatomic, retain) NSString * postalCode;
@property (nonatomic, retain) NSString * priceLevel;
@property (nonatomic, retain) NSNumber * rankingNumber;
@property (nonatomic, retain) NSString * rankingString;
@property (nonatomic, retain) NSString * state;
@property (nonatomic, retain) NSString * street1;
@property (nonatomic, retain) NSString * street2;
@property (nonatomic, retain) NSNumber * totalReviews;
@property (nonatomic, retain) NSNumber * type;
@property (nonatomic, retain) NSString * webURL;
@property (nonatomic, retain) NSSet *ports;
@end
@interface PointOfInterest (CoreDataGeneratedAccessors)
- (void)addPortsObject:(Port *)value;
- (void)removePortsObject:(Port *)value;
- (void)addPorts:(NSSet *)values;
- (void)removePorts:(NSSet *)values;
@end
在 Swift 中,代码如下所示:
// PointOfInterest.swift
class PointOfInterest: NSManagedObject {
@NSManaged var averageRating: NSNumber
@NSManaged var city: String
@NSManaged var countryName: String
@NSManaged var id: NSNumber
@NSManaged var imageURL: String
@NSManaged var latitude: NSNumber
@NSManaged var longitude: NSNumber
@NSManaged var name: String
@NSManaged var phone: String
@NSManaged var postalCode: String
@NSManaged var priceLevel: String
@NSManaged var rankingNumber: NSNumber
@NSManaged var rankingString: String
@NSManaged var state: String
@NSManaged var street1: String
@NSManaged var street2: String
@NSManaged var totalReviews: NSNumber
@NSManaged var type: NSNumber
@NSManaged var webURL: String
@NSManaged var ports: NSSet
}
包含 enum
的扩展在不同的文件中(我重命名了 enum
值)
// PointOfInterest+Helpers.swift
extension PointOfInterest
{
@objc enum Types:Int
{
case General
case Restaurant
case TypeCount
}
}
在我最初的 Objective-C View 之一中,我有以下行(和其他一些,但我们将专注于这一行,因为它们都有相同的错误)生成错误:Semantic问题:使用未声明的标识符“kGeneral”
poi.type = [NSNumber numberWithInt: kGeneral];
即使我将 kGeneral
更改为 General
甚至 TypesGeneral
,似乎也无法访问此 enum
来自 PointOfInterest
的值。 this question的答案没有帮助。
所以我的问题是:如何从 Objective-C 代码中检索 Swift 类级 enum
的值?
最佳答案
how do I retrieve the value of a Swift class-level enum from Objective-C code
你不能。 Objective-C 没有将枚举视为在另一个类“内部”的概念。如果您希望 Objective-C 能够看到它,请将枚举放在顶层。
关于ios - 如何从 Objective-C 代码访问 Swift 类级枚举,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/30874368/