Swift async/await - 忽略“考虑使用异步替代函数”警告

Question

I have some objective c networking code with completion handler for which swift has automatically generated an async version. I'm calling it at the end of an async function, but in this case I don't need to wait for it. I'm just passing nil for the completion handler. The compiler is giving me a warning:

Consider using asynchronous alternative function

Is there a swifty way to avoid this error? Or is the only option wrapping it in another function?

So far the best I've found is to just use a closure:

{
  noNeedToWaitForThis(completion: nil)
}()

This is in Xcode 13.1.

[EDIT] Example objective c method with callback:

typedef void (^LQClientResponseBlock)(BOOL success, id _Nullable object);
- (void)get:(nonnull NSString*)url parameters:(nullable NSDictionary*)parameters completion:(nullable LQClientResponseBlock)completion;

Answer 1

but in this case I don't need to wait for it

If you don't say await , then if there were no completion handler alternative, the compiler would error, not warn — because you can't call an async method without saying await .

But there is a completion handler version, so when you don't say await , the compiler takes you to be calling the completion handler version, and warns you, rightly, that the async version exists. And indeed, that is exactly what it seems you want the compiler to think.

I'm a little unclear what you mean by "I don't need to wait". But if you are serious about not wanting to wait, then call the async version from inside a Task initializer:

Task {
    await callMyAsyncFunction()
}

The code after the right curly brace will execute immediately, without waiting for the Task to end — indeed, without even waiting for it to begin! — and if that means the surrounding method would end, it ends. Basically, Task{} here works, from a structural point of view, just like saying DispatchQueue.someQueue.async .