How to close / cancel a NetworkConnection

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Created 2d

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Hello,

I have an app that was using the iOS 18 Network Framework APIs. It used Peer to Peer, QUIC and Bonjour. It was all working as expected. I wanted to upgrade to the new iOS 26 Network Framework APIs (NetworkBrowser, NetworkListener, NetworkConnection...).

I have things working (multiple devices can discover each other, connection to each other and send messages to each other) but my app crashes when I go to toggle of all the networking stuff.

In the iOS 18 Network Framework API NWConnection had a .cancel() function I could use to tell the other side the connection was done.

I dont see a cancel function for NetworkConnection.

My question is - how do I properly close down a NetworkConnection and also properly tell the other side the connection is done.

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Answer 1

DTS Engineer OP

Apple

2d

There’s no explicit cancel method in the new API. Rather, our expectation is that you’d use structure concurrency, meaning that:

All the use of a given connection would be within one scope.
When you exit that scope, that drops the last reference to the connection.
Which then cancels it.

There’s a similar setup for listeners and browser, except those enforce the rules by means of their run(…) methods.

my app crashes when I go to toggle of all the networking stuff.

Can you share an example crash report? See Posting a Crash Report for advice on how to do that.

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Quinn “The Eskimo!” @ Developer Technical Support @ Apple
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