ios - How to make speech synthesiser speak a bunch of utterances, one after another? -


i building app speak sentences/words stored in playlist 1 one. both playlists , items in them stored inside core data.

i added play/stop button in storyboard. here event handler it:

@ibaction func playclick(sender: uibarbuttonitem) {     if isplaying {         synthesizer.stopspeakingatboundary(.immediate)         isplaying = false         sender.image = uiimage(named: "play")     } else {         sender.image = uiimage(named: "stop")         isplaying = true         string in playlist.utterrances! {             let utterance = usersettings.getprefutterance((string as! utterance).string!)             utterance.postutterancedelay = 2             synthesizer.speakutterance(utterance)         }         isplaying = false         sender.image = uiimage(named: "play")     } }

isplaying (type bool), synthesizer (type avspeechsynthesizer) , playlist (type playlists, entity description) class-level variables.

i think code here pretty clear. first decide whether button should stop or start synthesizer. if latter, loop through items in playlist , synthesise them. switch images , mutate isplaying

but when run app , press button, nothing @ happens. no sound, no image change, no nothing. think because of last 2 lines in method, deleted them. time, image of button changes still no sound.

i think must because telling synthesiser start speaking before last utterance finished. or need know when synthesiser stops speaking , start utterance.

"but why don't join strings , synthesise once?", asked. because want have two-second delay between each item in playlist!

question:

how can play contents of playlist 1 after another? (with noticeable amount of delay in between)

or

what characters need use create avspeechutterance can pause noticeable amount of time?

the best way using avspeechsynthesizerdelegate.

it has method... speechsynthesizer(_:didfinishspeechutterance:) called when utterance finishes.

you can keep track of utterance being spoken , when delegate gets informed of being finished start next one.

if want them play when button clicked disable button when delegate gets informed of didstartspeechutterance , enable button on didfinish....


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