The -swift.h file generated by xcode does not contain these two things, I don't know why?SKProductsRequestDelegateSKPaymentTransactionObserverMy Code Very Simpleimport Foundation import StoreKit class OrangeExchangeUtil: NSObject, SKProductsRequestDelegate, SKPaymentTransactionObserver { func productsRequest(_ request: SKProductsRequest, didReceive response: SKProductsResponse) { } func paymentQueue(_ queue: SKPaymentQueue, updatedTransactions transactions: [SKPaymentTransaction]) { } }-swift.h// Generated by Apple Swift version 5.1.2 effective-4.2 (swiftlang-1100.0.278 clang-1100.0.33.9) #pragma clang diagnostic push #pragma clang diagnostic ignored "-Wgcc-compat" #if !defined(__has_include) # define __has_include(x) 0 #endif #if !defined(__has_attribute) # define __has_attribute(x) 0 #endif #if !defined(__has_feature) # define __has_feature(x) 0 #endif #if !defined(__has_warning) # define __has_warning(x) 0 #endif #if __has_include() # include #endif #pragma clang diagnostic ignored "-Wauto-import" #include #include #include #include #if !defined(SWIFT_TYPEDEFS) # define SWIFT_TYPEDEFS 1 # if __has_include() # include # elif !defined(__cplusplus) typedef uint_least16_t char16_t; typedef uint_least32_t char32_t; # endif typedef float swift_float2 __attribute__((__ext_vector_type__(2))); typedef float swift_float3 __attribute__((__ext_vector_type__(3))); typedef float swift_float4 __attribute__((__ext_vector_type__(4))); typedef double swift_double2 __attribute__((__ext_vector_type__(2))); typedef double swift_double3 __attribute__((__ext_vector_type__(3))); typedef double swift_double4 __attribute__((__ext_vector_type__(4))); typedef int swift_int2 __attribute__((__ext_vector_type__(2))); typedef int swift_int3 __attribute__((__ext_vector_type__(3))); typedef int swift_int4 __attribute__((__ext_vector_type__(4))); typedef unsigned int swift_uint2 __attribute__((__ext_vector_type__(2))); typedef unsigned int swift_uint3 __attribute__((__ext_vector_type__(3))); typedef unsigned int swift_uint4 __attribute__((__ext_vector_type__(4))); #endif #if !defined(SWIFT_PASTE) # define SWIFT_PASTE_HELPER(x, y) x##y # define SWIFT_PASTE(x, y) SWIFT_PASTE_HELPER(x, y) #endif #if !defined(SWIFT_METATYPE) # define SWIFT_METATYPE(X) Class #endif #if !defined(SWIFT_CLASS_PROPERTY) # if __has_feature(objc_class_property) # define SWIFT_CLASS_PROPERTY(...) __VA_ARGS__ # else # define SWIFT_CLASS_PROPERTY(...) # endif #endif #if __has_attribute(objc_runtime_name) # define SWIFT_RUNTIME_NAME(X) __attribute__((objc_runtime_name(X))) #else # define SWIFT_RUNTIME_NAME(X) #endif #if __has_attribute(swift_name) # define SWIFT_COMPILE_NAME(X) __attribute__((swift_name(X))) #else # define SWIFT_COMPILE_NAME(X) #endif #if __has_attribute(objc_method_family) # define SWIFT_METHOD_FAMILY(X) __attribute__((objc_method_family(X))) #else # define SWIFT_METHOD_FAMILY(X) #endif #if __has_attribute(noescape) # define SWIFT_NOESCAPE __attribute__((noescape)) #else # define SWIFT_NOESCAPE #endif #if __has_attribute(warn_unused_result) # define SWIFT_WARN_UNUSED_RESULT __attribute__((warn_unused_result)) #else # define SWIFT_WARN_UNUSED_RESULT #endif #if __has_attribute(noreturn) # define SWIFT_NORETURN __attribute__((noreturn)) #else # define SWIFT_NORETURN #endif #if !defined(SWIFT_CLASS_EXTRA) # define SWIFT_CLASS_EXTRA #endif #if !defined(SWIFT_PROTOCOL_EXTRA) # define SWIFT_PROTOCOL_EXTRA #endif #if !defined(SWIFT_ENUM_EXTRA) # define SWIFT_ENUM_EXTRA #endif #if !defined(SWIFT_CLASS) # if __has_attribute(objc_subclassing_restricted) # define SWIFT_CLASS(SWIFT_NAME) SWIFT_RUNTIME_NAME(SWIFT_NAME) __attribute__((objc_subclassing_restricted)) SWIFT_CLASS_EXTRA # define SWIFT_CLASS_NAMED(SWIFT_NAME) __attribute__((objc_subclassing_restricted)) SWIFT_COMPILE_NAME(SWIFT_NAME) SWIFT_CLASS_EXTRA # else # define SWIFT_CLASS(SWIFT_NAME) SWIFT_RUNTIME_NAME(SWIFT_NAME) SWIFT_CLASS_EXTRA # define SWIFT_CLASS_NAMED(SWIFT_NAME) SWIFT_COMPILE_NAME(SWIFT_NAME) SWIFT_CLASS_EXTRA # endif #endif #if !defined(SWIFT_RESILIENT_CLASS) # if __has_attribute(objc_class_stub) # define SWIFT_RESILIENT_CLASS(SWIFT_NAME) SWIFT_CLASS(SWIFT_NAME) __attribute__((objc_class_stub)) # define SWIFT_RESILIENT_CLASS_NAMED(SWIFT_NAME) __attribute__((objc_class_stub)) SWIFT_CLASS_NAMED(SWIFT_NAME) # else # define SWIFT_RESILIENT_CLASS(SWIFT_NAME) SWIFT_CLASS(SWIFT_NAME) # define SWIFT_RESILIENT_CLASS_NAMED(SWIFT_NAME) SWIFT_CLASS_NAMED(SWIFT_NAME) # endif #endif #if !defined(SWIFT_PROTOCOL) # define SWIFT_PROTOCOL(SWIFT_NAME) SWIFT_RUNTIME_NAME(SWIFT_NAME) SWIFT_PROTOCOL_EXTRA # define SWIFT_PROTOCOL_NAMED(SWIFT_NAME) SWIFT_COMPILE_NAME(SWIFT_NAME) SWIFT_PROTOCOL_EXTRA #endif #if !defined(SWIFT_EXTENSION) # define SWIFT_EXTENSION(M) SWIFT_PASTE(M##_Swift_, __LINE__) #endif #if !defined(OBJC_DESIGNATED_INITIALIZER) # if __has_attribute(objc_designated_initializer) # define OBJC_DESIGNATED_INITIALIZER __attribute__((objc_designated_initializer)) # else # define OBJC_DESIGNATED_INITIALIZER # endif #endif #if !defined(SWIFT_ENUM_ATTR) # if defined(__has_attribute) && __has_attribute(enum_extensibility) # define SWIFT_ENUM_ATTR(_extensibility) __attribute__((enum_extensibility(_extensibility))) # else # define SWIFT_ENUM_ATTR(_extensibility) # endif #endif #if !defined(SWIFT_ENUM) # define SWIFT_ENUM(_type, _name, _extensibility) enum _name : _type _name; enum SWIFT_ENUM_ATTR(_extensibility) SWIFT_ENUM_EXTRA _name : _type # if __has_feature(generalized_swift_name) # define SWIFT_ENUM_NAMED(_type, _name, SWIFT_NAME, _extensibility) enum _name : _type _name SWIFT_COMPILE_NAME(SWIFT_NAME); enum SWIFT_COMPILE_NAME(SWIFT_NAME) SWIFT_ENUM_ATTR(_extensibility) SWIFT_ENUM_EXTRA _name : _type # else # define SWIFT_ENUM_NAMED(_type, _name, SWIFT_NAME, _extensibility) SWIFT_ENUM(_type, _name, _extensibility) # endif #endif #if !defined(SWIFT_UNAVAILABLE) # define SWIFT_UNAVAILABLE __attribute__((unavailable)) #endif #if !defined(SWIFT_UNAVAILABLE_MSG) # define SWIFT_UNAVAILABLE_MSG(msg) __attribute__((unavailable(msg))) #endif #if !defined(SWIFT_AVAILABILITY) # define SWIFT_AVAILABILITY(plat, ...) __attribute__((availability(plat, __VA_ARGS__))) #endif #if !defined(SWIFT_WEAK_IMPORT) # define SWIFT_WEAK_IMPORT __attribute__((weak_import)) #endif #if !defined(SWIFT_DEPRECATED) # define SWIFT_DEPRECATED __attribute__((deprecated)) #endif #if !defined(SWIFT_DEPRECATED_MSG) # define SWIFT_DEPRECATED_MSG(...) __attribute__((deprecated(__VA_ARGS__))) #endif #if __has_feature(attribute_diagnose_if_objc) # define SWIFT_DEPRECATED_OBJC(Msg) __attribute__((diagnose_if(1, Msg, "warning"))) #else # define SWIFT_DEPRECATED_OBJC(Msg) SWIFT_DEPRECATED_MSG(Msg) #endif #if !defined(IBSegueAction) # define IBSegueAction #endif #if __has_feature(modules) #if __has_warning("-Watimport-in-framework-header") #pragma clang diagnostic ignored "-Watimport-in-framework-header" #endif @import ObjectiveC; @import StoreKit; #endif #pragma clang diagnostic ignored "-Wproperty-attribute-mismatch" #pragma clang diagnostic ignored "-Wduplicate-method-arg" #if __has_warning("-Wpragma-clang-attribute") # pragma clang diagnostic ignored "-Wpragma-clang-attribute" #endif #pragma clang diagnostic ignored "-Wunknown-pragmas" #pragma clang diagnostic ignored "-Wnullability" #if __has_attribute(external_source_symbol) # pragma push_macro("any") # undef any # pragma clang attribute push(__attribute__((external_source_symbol(language="Swift", defined_in="palaceCookie",generated_declaration))), apply_to=any(function,enum,objc_interface,objc_category,objc_protocol)) # pragma pop_macro("any") #endif @class SKProductsRequest; @class SKProductsResponse; @class SKPaymentQueue; @class SKPaymentTransaction; SWIFT_CLASS("_TtC12palaceCookie18OrangeExchangeUtil") @interface OrangeExchangeUtil : NSObject <skpaymenttransactionobserver, skproductsrequestdelegate=""> - (void)productsRequest:(SKProductsRequest * _Nonnull)request didReceiveResponse:(SKProductsResponse * _Nonnull)response; - (void)paymentQueue:(SKPaymentQueue * _Nonnull)queue updatedTransactions:(NSArray * _Nonnull)transactions; - (nonnull instancetype)init OBJC_DESIGNATED_INITIALIZER; @end #if __has_attribute(external_source_symbol) # pragma clang attribute pop #endif #pragma clang diagnostic popError

only@class SKProductsRequest; @class SKProductsResponse; @class SKPaymentQueue; @class SKPaymentTransaction;

I guess the problem may be caused because I am c ++, swift, oc, 3 languages mixing

This is a problem with mixed compilation oc,swift,c++add@protocol SKPaymentTransactionObserver;@protocol SKProductsRequestDelegate;in c++ .h file this this can solve this problemthank you