Thank you! I was looking for this last night and failed.
Why do you think {public} isn't included?
Sent from my iPad
> On Sep 3, 2016, at 2:06 PM, Ben Rimmington <[email protected]> wrote:
>
>
>> On 3 Sep 2016, at 04:24, Brandon Knope wrote:
>>
>> I am unsure where to post this…but iOS 10 is introducing a new API for
>> activity tracing and logging.
>>
>> The API has been “Swift-ified” a little, but it still is a little awkward to
>> use:
>>
>> os_log("Sender: %{public}@", log: ViewController.ui_log, type: .debug,
>> sender)
>>
>> (This is taken from:
>> https://developer.apple.com/library/prerelease/content/samplecode/Logging/Introduction/Intro.html#//apple_ref/doc/uid/TP40017510)
>>
>> Note: the {public} modifier above does not work in swift but does in
>> Objective-C. I have filed a radar for this.
>
> Activity Tracing (2014) and Unified Logging (2016) APIs are complex
> preprocessor macros, which are not imported into Swift.
>
> <https://developer.apple.com/videos/play/wwdc2014/714/>
>
> <https://developer.apple.com/videos/play/wwdc2016/721/>
>
> The os_log_with_type macro in <os/log.h> uses __builtin_os_log_format to
> encode its arguments into a byte array. The overlay for Swift instead uses
> its _os_log_encode C++ function, which only recognizes the {private} modifier.
>
>
> <https://github.com/apple/swift/blob/e06d676d756ce95bd7c32a3029d165c7be5fd4b4/stdlib/public/SDK/os/os.mm#L245-L255>
>
> <https://github.com/apple/swift/tree/master/stdlib/public/SDK/os>
>
>> A few things:
>> • This looks like how the Dispatch APIs use to look: very C-like which was
>> made to be much better in The Great Renaming
>> • Cannot use Swift’s string interpolation, resulting in the arguments being
>> passed in at the end
>>
>> For reference, this is what it looks like in Objective-C, showing that SOME
>> renaming has occurred:
>> os_log_debug(ui_log, "Sender: %{public}@", sender);
>>
>> This might look more Swift-like:
>> uiLog.log("Sender: %{public}\(sender)”, type: .debug)
>> * Makes “log” a method on an OSLog object
>> • Uses string interpolation
>
> The format string of os_log APIs is required to be constant. The overlay uses
> a StaticString, which isn't ExpressibleByStringInterpolation. SE-0137 also
> deprecated the protocol, so that it can be redesigned.
>
>
> <https://github.com/apple/swift-evolution/blob/master/proposals/0137-avoiding-lock-in.md>
>
> An instance method of OSLog might be better, except when using the `default`
> object.
>
> OSLog.default.log("message")
>
> Similarly, the Swift.print(_:separator:terminator:to:) function might be
> better as a TextOutputStream method.
>
> -- Ben
>
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