AVPlayer Seek Smoothly

AVPlayerSeekSmoothly.swift

var isSeekInProgress = false
var chasingTime = CMTime.zero

func seekActually(time: CMTime) {
    isSeekInProgress = true
    playerView?.player.seek(to: time, toleranceBefore: CMTime.zero, toleranceAfter: CMTime.zero) { success in
        if time == self.chasingTime {
            self.isSeekInProgress = false
        } else {
            self.trySeekToChaseTime()
        }
    }
}

func trySeekToChaseTime() {
    guard let status = playerView.player.currentItem?.status, status != .readyToPlay else { return }
    seekActually(time: chasingTime)
}

func seekSmoothly(to time: CMTime) {
    if chasingTime != time {
        chasingTime = time
        if !isSeekInProgress {
            trySeekToChaseTime()
        }
    }
}