Objective
Objective-C中的swift类：未知接收器(swift class in Objective-C: unknown receiver)我在swift文件中写了一个类：
class UtilityMethods { class func userId() -> Integer { ... } class func setUserId(userId : Int) { ... }}我正在导入-swift.h-header编译好，但是我无法使用
[UtilityMethods userId];在我的Objective-C代码中：
Unknown receiver 'UtilityMethods'; did you mean 'UtilMethods'?
UtilMethods是一个我想要替换的Objective-C类。 我错过了什么吗？
编辑在Lance的帮助下，该类现在已被识别，但不幸的是，getter方法不是头文件如下所示：
SWIFT_CLASS("_TtC15...14UtilityMethods")@interface UtilityMethods : NSObject+ (void)setUserId:(NSInteger)userId;- (instancetype)init OBJC_DESIGNATED_INITIALIZER;@end为什么吸气剂会丢失？
I wrote a class in a swift-file:
class UtilityMethods { class func userId() -> Integer { ... } class func setUserId(userId : Int) { ... }}I'm importing the -swift.h-header which compiles fine, but I can't use
[UtilityMethods userId];in my Objective-C code:
Unknown receiver 'UtilityMethods'; did you mean 'UtilMethods'?
UtilMethodsis an Objective-C class I'd like to replace. Am I missing something?
EDIT With the help of Lance, the class is now recognized, but the getter method isn't, unfortunately, the header files looks like the following:
SWIFT_CLASS("_TtC15...14UtilityMethods")@interface UtilityMethods : NSObject+ (void)setUserId:(NSInteger)userId;- (instancetype)init OBJC_DESIGNATED_INITIALIZER;@endWhy is the getter missing?
最满意答案为了让Objective C可以使用Swift类，您有两个选择：
选项1：子类NSObject（或其他一些Objective C类）
class UtilityMethods : NSObject { class func userId() -> Int { ... } class func setUserId(userId: Int) { ... }}选项2：将@objc属性添加到类中，告诉Swift编译器创建一个Objective C对象，该对象使用动态分派而不是静态分派方法调用
@objc class UtilityMethods { class func userId() -> Int { ... } class func setUserId(userId: Int) { ... }}In order to have a Swift class available to Objective C you have two options:
Option 1: Subclass NSObject (or some other Objective C class)
class UtilityMethods : NSObject { class func userId() -> Int { ... } class func setUserId(userId: Int) { ... }}Option 2: Add the @objc attribute to your class telling the Swift compiler to make an Objective C object that uses dynamic dispatch rather than static dispatch for method calls
@objc class UtilityMethods { class func userId() -> Int { ... } class func setUserId(userId: Int) { ... }}