如何在第一次从定时器完成后调用下面函数中的函数

Question

这是我的简单形式的流程。我仍然需要调用decisionMaker（），当＃2完成后运行完成时间为up并将测量的全局变量带到决策者（）进行案例测试

TestButtonTAPPED（）并调用：

1. recordTimer（）

2. gatherInput（）

3. selector：levelTimerCallback（）

4. 决策者（）

   // 1.
   func recordTimer() {
       /* After 10 seconds, let's stop the recording process */
       let delayInSeconds = 10.0
       let delayInNanoSeconds = DispatchTime.now() + Double(Int64(delayInSeconds * Double(NSEC_PER_SEC))) / Double(NSEC_PER_SEC)
   
       DispatchQueue.main.after(when: delayInNanoSeconds, execute: {
           self.soundRecorder!.stop()
           self.handBtn.isHidden = false
       })
   
   }
   
   // 2.
   func gatherInput() {
       levelTimer = Timer.scheduledTimer(timeInterval: 0.9, target: self, selector: #selector(DBListener.levelTimerCallback), userInfo:nil, repeats: true)
   }
   
   //3.
   func levelTimerCallback() {
       if soundRecorder.averagePower(forChannel: 0) > -30
       {
           // Do gathering for vaiables
       }
   }
   
   
   // 4.
   func decisionMaker() {
       // case statments here for final measurement
   }
   
   
   
   @IBAction func handTapped(_ sender: UIButton) {
   
       clearGlobalVariablesOnTap()
       listner()
       soundRecorder.record()
       recordTimer()
       dbListener.gatherInput()
   
   }
   

Answer 1

@IBAction func handTapped(_ sender: UIButton) {
    clearGlobalVariablesOnTap()
    listner()
    soundRecorder.record()
    recordTimer()
}

func recordTimer() {

    //As soon as this method is called this portion will get executed
    dbListener.gatherInput()

    /* After 10 seconds, let's stop the recording process */
    let delay = 10.0
    let delayInSeconds = DispatchTime.now() + DispatchTimeInterval.seconds(delay)


    //After 10 seconds this block will execute
    DispatchQueue.main.after(when: delayInSeconds, execute: {
        self.soundRecorder!.stop()
        self.handBtn.isHidden = false
        self.levelTimer.invalidate = true
        self.decisionMaker()
    })

}

func gatherInput() {
    levelTimer = Timer.scheduledTimer(timeInterval: 0.9, target: self, selector: #selector(DBListener.levelTimerCallback), userInfo:nil, repeats: true)
}

func levelTimerCallback() {
    if soundRecorder.averagePower(forChannel: 0) > -30
    {
        // Do gathering for vaiables
    }
}


func decisionMaker() {
    // case statments here for final measurement
}