Strange error message when assigning Swift function with arguments to Objective-C property

I would like to set some properties of an Objective-C class instance to some Swift functions and I am getting an error that I do not understand, maybe something with the types is wrong:

Objective-C:

@interface MyWrapper : NSObject  @property (nonatomic) void(*f1)();  @property (nonatomic) void(*f2)(void*);  @end  

Swift:

func saySomething1() {      print("Something 1")  }    func saySomething2(buf:UnsafeRawPointer) {      print("Something 2")  }    let x = MyWrapper()  x.f1 = saySomething1 // OK  x.f2 = saySomething2 // error: Cannot assign to property: 'x' is a 'let' constant  

Changing let to var does not help (same error message).

https://stackoverflow.com/questions/66975335/strange-error-message-when-assigning-swift-function-with-arguments-to-objective April 07, 2021 at 03:31AM