ios - How to write this void objective-c function in swift -

ios - How to write this void objective-c function in swift -

i've found code want utilize in swift ios app i'm having problem writing swift way.

-(void) captureoutput:(avcaptureoutput*)captureoutput didoutputsamplebuffer:(cmsamplebufferref)samplebuffer fromconnection:(avcaptureconnection*)connection { cvimagebufferref imagebuffer = cmsamplebuffergetimagebuffer( samplebuffer ); cgsize imagesize = cvimagebuffergetencodedsize( imagebuffer ); // in 'mediaspecific' dict of samplebuffer nslog( @"frame captured @ %.fx%.f", imagesize.width, imagesize.height ); }

it's function declaration i'm having problem with, contents of function should easier. i'm not used syntax of:

-(void) captureoutput:(avcaptureoutput*)captureoutput didoutputsamplebuffer:(cmsamplebufferref)samplebuffer fromconnection:(avcaptureconnection*)connection

my attempt:

i started trying write when nil autocomplete within () realised wrong:

func captureoutput(avcaptureoutput(didoutputsamplebuffer:)) { }

you can find right declaration in avcapturevideodataoutputsamplebufferdelegate protocol reference, declared this:

optional func captureoutput(_ captureoutput: avcaptureoutput!, didoutputsamplebuffer samplebuffer: cmsamplebuffer!, fromconnection connection: avcaptureconnection!)

you wouldn't write optional in method definition, though:

class mydelegate: nsobject, avcapturevideodataoutputsamplebufferdelegate { func captureoutput(captureoutput:avcaptureoutput, didoutputsamplebuffer samplebuffer:cmsamplebuffer, fromconnection connection:avcaptureconnection) { allow imagebuffer = cmsamplebuffergetimagebuffer(samplebuffer) allow imagesize = cvimagebuffergetencodedsize(imagebuffer) nslog("frame captured @ %.fx%.f", imagesize.width, imagesize.height) } }

ios objective-c function swift