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[英]How can I stop a for each loop iteration if I need to call break inside a switch in Swift?
[英]How can I make speech occur immediately for each iteration of a while loop in Swift?
这是我的游乐场代码:
import AVFoundation
var speechsynth: AVSpeechSynthesizer = AVSpeechSynthesizer()
let wordsToSpeak = ["word one","word two","word three","word four"]
let endTime = NSDate().dateByAddingTimeInterval(10)
while endTime.timeIntervalSinceNow > 0 {
//workaround for iOS8 Bug
var beforeSpeechString : String = " "
var beforeSpeech:AVSpeechUtterance = AVSpeechUtterance(string: beforeSpeechString)
speechsynth.speakUtterance(beforeSpeech)
//realstring to speak
var speechString: String = wordsToSpeak[0]
var nextSpeech:AVSpeechUtterance = AVSpeechUtterance(string: speechString)
nextSpeech.voice = AVSpeechSynthesisVoice(language: "en-US")
nextSpeech.rate = AVSpeechUtteranceMinimumSpeechRate
speechsynth.speakUtterance(nextSpeech)
}
目前,讲话在while循环完成后开始。
如何在每次迭代过程中说出并完成说话,然后再进行循环的下一次迭代?
将每个单词视为任务,在Delegate的didFinishSpeechUtterance方法中触发下一个任务。
import UIKit
import AVFoundation
class ViewController: UIViewController, AVSpeechSynthesizerDelegate {
var queue: dispatch_queue_t = dispatch_queue_create(
"com.test.whatever.queue", DISPATCH_QUEUE_SERIAL)
var index: Int = 0
let words: [String] = ["word one","word two","word three","word four"]
var speechsynth: AVSpeechSynthesizer = AVSpeechSynthesizer()
override func viewDidLoad() {
super.viewDidLoad()
// Do any additional setup after loading the view, typically from a nib.
speechsynth.delegate = self
self.speechCurrentWord()
}
func speechCurrentWord(){
dispatch_async(queue, { () -> Void in
var beforeSpeechString : String = " "
var beforeSpeech:AVSpeechUtterance = AVSpeechUtterance(string: beforeSpeechString)
self.speechsynth.speakUtterance(beforeSpeech)
var nextSpeech:AVSpeechUtterance = AVSpeechUtterance(string: self.words[self.index])
nextSpeech.voice = AVSpeechSynthesisVoice(language: "en-US")
nextSpeech.rate = AVSpeechUtteranceMinimumSpeechRate
self.speechsynth.speakUtterance(nextSpeech)
})
}
func speechSynthesizer(synthesizer: AVSpeechSynthesizer!, didFinishSpeechUtterance utterance: AVSpeechUtterance!) {
index++
if index < self.words.count {
self.speechCurrentWord()
}
}
}
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