在 Objective-C 中使用完成处理程序调用 Swift 函数

Question

我有一个 react 原生应用。我正在尝试将 react native 与 ios 联系起来：

RCT_EXPORT_METHOD(getUserProfile:(RCTResponseSenderBlock)callback) {
  Cosmote *cosmote = [[Cosmote alloc] init];
  NSString * x;
  NSString * str;
  x = [cosmote getUserProfileWithCompletionHandler:^(NSString* string){string}]
  callback(@[x]);
}

在 Cosmote.swift 中我有这个功能：

@objc
  open func getUserProfile(completionHandler: @escaping (_ s: String) -> ()) {
    let x = UserDetailsManager.self;
    x.getUserDetails(completionBlock: {data in
      print("got user Details")
      var json:String = "{\"data\": {\"guid\": \"\(data.guid)\", \"email\": \"\(data.email)\", \"username\": \"\(data.username)\", \"firstName\": \"\(data.firstname)\", \"lastName\": \"\(data.lastname)\", \"otePortalStatus\": \"\(data.otePortalStatus)\", \"otePortalisCorporate\": \"\(data.otePortalisCorporate)\", \"otePortalUserLevel\": \"\(data.otePortalUserLevel)\", \"otePortalAuthenticationLevel\": \"\(data.otePortalAuthenticationLevel)\", \"otePortalPIN\": \"\(data.otePortalPIN)\", \"otePortalEbppActivationDate\": \"\(data.otePortalEbppActivationDate)\", \"otePortalEbppEcareNumber\": \"\(data.otePortalEbppEcareNumber)\", \"otePortalEbppStatus\": \"\(data.otePortalEbppStatus)\", \"otegroupPasswordDate\": \"\(data.otegroupPasswordDate)\", \"otegroupStatus\": \"\(data.otegroupStatus)\", \"otegroupPasswordExpiration\": \"\(data.otegroupPasswordExpiration)\", \"otegroupPasswordReset\": \"\(data.otegroupPasswordReset)\", \"otegroupRegistrationDate\": \"\(data.otegroupRegistrationDate)\", \"otegroupAlternativeEmail\": \"\(data.otegroupAlternativeEmail)\", \"otegroupAlternativeMSISDN\": \"\(data.otegroupAlternativeMSISDN)\", \"imageURL\": \"\(data.imageURL)\"}}"
      completionHandler(json);
    }, onError: {_ in
      print("did not get user Details")
      completionHandler("{}");
    })
  }

第一个函数：

x = [cosmote getUserProfileWithCompletionHandler:^(NSString* string){string}]

我收到了错误：

从不兼容的类型'void'分配给'NSString *__strong'

不兼容的块指针类型发送 'void (^)(NSString *__strong)' 转换为 'NSString * _Nonnull (^ _Nonnull)(NSString * _Nonnull __strong)' 类型的参数

我该如何解决这个问题？

Answer 1

只需从方法completionHandler 中调用您的“回调”。 这应该适合你：

RCT_EXPORT_METHOD(getUserProfile:(RCTResponseSenderBlock)callback) {
   Cosmote *cosmote = [[Cosmote alloc] init];
   [cosmote getUserProfileWithCompletionHandler:^(NSString* string){
      callback(string)
   }];
}