App crashes when it use a mixed objc/swift framework that contains async call

Question

MahAlleinir OP

Created Nov ’22

Replies 1

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Views 1.3k

Participants 1

Hi everyone ;-)

I work on an objc framework and we will modernize it by starting to implement new features in Swift. To do so, I'm currently writing a POC, but I encountered a weird crash.

If I just add some basic swift files and call them from my objc code, I can use my xcframework easily (from a swift app for the record). But, if the swift code contains Async/Await calls (even wrapped in a completion method), it does not work.

This code leads to a crash right away :

 @objcMembers public class SwiftChecker: NSObject {
  @available(iOS 13.0.0, *)
  func check() async {
    let data = try? await URLSession().data(for: URLRequest(url: URL(string: "http://www.google.fr")!))
    if let data {
      print("Yay! ❤️ \(data.0.count)")
    } else {
      print("Nay 😡")
    }
  }
   
  public func check(completion: @escaping (() -> Void)) {
    if #available(iOS 13.0.0, *) {
      Task {
        await check()
        completion()
      }
    } else {
      completion()
    }
  }
}

And I call it like that (inside the framework fyi) :

 if (@available(iOS 13.0, *)) {
      SwiftChecker* checker = [[SwiftChecker alloc] init];
      [checker checkWithCompletion:^{
         
      }];
    }

I even tried a more simpler code with

 @objcMembers public class SwiftChecker: NSObject {
  @available(iOS 13.0.0, *)
  func check() {
    Task {
      let data = try? await URLSession().data(for: URLRequest(url: URL(string: "http://www.google.fr")!))
      if let data {
        print("Yay! ❤️ \(data.0.count)")
      } else {
        print("Nay 😡")
      }
    }
  }
}

but the result is the same.

I f I don't use Task, then it works :-/ I can't find any reason or literature that indicates not to use modern concurrency with objC, especially when it's wrapped into a completion block like signature.

I just can't give you the crash log as it has nothing to do with the actual crash. It's just a exit with signal 6

Any help would be appreciated. Thanks!

Answered by MahAlleinir in 737357022

Don't bother, I'm an *****, it's just URLSession instead of URLSession.shared :D

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Answer 1

MahAlleinir OP

Nov ’22

Accepted Answer

Don't bother, I'm an *****, it's just URLSession instead of URLSession.shared :D

0

	@objcMembers public class SwiftChecker: NSObject {
	@available(iOS 13.0.0, *)
	func check() async {
	let data = try? await URLSession().data(for: URLRequest(url: URL(string: "http://www.google.fr")!))
	if let data {
	print("Yay! ❤️ \(data.0.count)")
	} else {
	print("Nay 😡")
	}
	}

	public func check(completion: @escaping (() -> Void)) {
	if #available(iOS 13.0.0, *) {
	Task {
	await check()
	completion()
	}
	} else {
	completion()
	}
	}
	}

	if (@available(iOS 13.0, *)) {
	SwiftChecker* checker = [[SwiftChecker alloc] init];
	[checker checkWithCompletion:^{

	}];
	}

	@objcMembers public class SwiftChecker: NSObject {
	@available(iOS 13.0.0, *)
	func check() {
	Task {
	let data = try? await URLSession().data(for: URLRequest(url: URL(string: "http://www.google.fr")!))
	if let data {
	print("Yay! ❤️ \(data.0.count)")
	} else {
	print("Nay 😡")
	}
	}
	}
	}