我有一个UIScrollView设置但是当我改变视图时音乐不会停止。如何更改视图时音乐会停止？
override func viewDidAppear(_ animated: Bool) {
super.viewDidAppear( animated)
meditationState = .on
setTrackForPlayerWith(trackName: "Bigsur")
player.play()
player.numberOfLoops = -1
}
这是来自viewcontroller.swift的整个类。我添加了func scrollViewDidScroll和你提到的自我部分，但它仍然没有工作。
import UIKit
class ViewController: UIViewController, UIScrollViewDelegate {
@IBOutlet weak var scrollView: UIScrollView!
override func viewDidLoad() {
super.viewDidLoad()
let vc0 = ViewController0(nibName: "ViewController0", bundle: nil)
var frame0 = vc0.view.frame
frame0.origin.x = self.view.frame.size.width
vc0.view.frame = frame0
self.addChildViewController(vc0)
self.scrollView.addSubview(vc0.view)
vc0.didMove(toParentViewController: self)
let vc1 = ViewController1(nibName: "ViewController1", bundle: nil)
var frame1 = vc1.view.frame
frame1.origin.x = self.view.frame.size.width
vc1.view.frame = frame1
self.addChildViewController(vc1)
self.scrollView.addSubview(vc1.view)
vc1.didMove(toParentViewController: self)
let vc2 = ViewController2(nibName: "ViewController2", bundle: nil)
var frame2 = vc2.view.frame
frame2.origin.x = self.view.frame.size.width * 2
vc2.view.frame = frame2
self.addChildViewController(vc2)
self.scrollView.addSubview(vc2.view)
vc2.didMove(toParentViewController: self)
let vc3 = ViewController3(nibName: "ViewController3", bundle: nil)
var frame3 = vc3.view.frame
frame3.origin.x = self.view.frame.size.width * 3
vc1.view.frame = frame3
self.addChildViewController(vc3)
self.scrollView.addSubview(vc3.view)
vc3.didMove(toParentViewController: self)
self.scrollView.contentSize = CGSize(width: Double(self.view.frame.size.width * 4), height: Double(self.view.frame.size.height - 66))
self.scrollView.delegate = self
}
func scrollViewDidScroll(_ scrollView: UIScrollView) {
if scrollView.contentOffset.x > self.view.frame.size.x {
player.stop()
}
}
}
override func didReceiveMemoryWarning() {
super.didReceiveMemoryWarning()
// Dispose of any resources that can be recreated.
}
}
ViewController3声明'player'：
import UIKit
import AVFoundation
enum MeditationState {
case on
case off
}
class ViewController3: UIViewController {
var player:AVAudioPlayer = AVAudioPlayer()
var player1:AVAudioPlayer = AVAudioPlayer()
var meditationState: MeditationState?
var replicatorLayer = CAReplicatorLayer()
var dot = CALayer()
func updateTimer(){
seconds += 1
timerclock.text = "\(seconds)"
}
// Animation starts running
func animation2() {
// A layer that creates a specified number of copies of its sublayers (the source layer), each copy potentially having geometric, temporal, and color transformations applied to it.
replicatorLayer = CAReplicatorLayer()
// The layer’s bounds rectangle. Animatable.
replicatorLayer.bounds = CGRect(x: 0.0, y: 0.0, width: 300.0, height: 300.0)
// The radius to use when drawing rounded corners for the layer’s background. Animatable.
replicatorLayer.cornerRadius = 10.0
// The background color of the receiver. Animatable.
replicatorLayer.backgroundColor = UIColor(white: 0.0, alpha: 0.0).cgColor
// The layer’s position in its superlayer’s coordinate space. Animatable.
replicatorLayer.position = view.center
// calling this method creates an array for that property and adds the specified layer to it.
view.layer.addSublayer(replicatorLayer)
// connectng the animation to the content
// An object that manages image-based content and allows you to perform animations on that content
dot = CALayer()
// The layer’s bounds rectangle. Animatable.
dot.bounds = CGRect(x: 0.0, y: 0.0, width: 12.0, height: 12.0)
//The layer’s position in its superlayer’s coordinate space. Animatable.
dot.position = CGPoint(x: 150.0, y: 40.0)
//The background color of the receiver. Animatable.
dot.backgroundColor = UIColor(white: 0.2, alpha: 1.0).cgColor
// The color of the layer’s border. Animatable.
dot.borderColor = UIColor(white: 1.0, alpha: 1.0).cgColor
// The width of the layer’s border. Animatable.
dot.borderWidth = 1.0
//The radius to use when drawing rounded corners for the layer’s background. Animatable.
dot.cornerRadius = 5.0
//Appends the layer to the layer’s list of sublayers.
replicatorLayer.addSublayer(dot)
// number of copies of layer is instanceCount
let nrDots: Int = 1000
//The number of copies to create, including the source layers.
replicatorLayer.instanceCount = nrDots
// The basic type for floating-point scalar values in Core Graphics and related frameworks.
let angle = CGFloat(2*M_PI) / CGFloat(nrDots)
// The transform matrix applied to the previous instance to produce the current instance. Animatable.
replicatorLayer.instanceTransform = CATransform3DMakeRotation(angle, 0.0, 0.0, 1.0)
// Type used to represent elapsed time in seconds.
let duration: CFTimeInterval = 10.0
// animation capabilities for a layer property.
// An object that provides basic, single-keyframe animation capabilities for a layer property.
let shrink = CABasicAnimation(keyPath: "transform.scale")
// Defines the value the receiver uses to start interpolation.
shrink.fromValue = 1.0
// Defines the value the receiver uses to end interpolation.
shrink.toValue = 0.1
// Specifies the basic duration of the animation, in seconds.
shrink.duration = duration
// Determines the number of times the animation will repeat.
shrink.repeatCount = Float.infinity
// Add the specified animation object to the layer’s render tree.
dot.add(shrink, forKey: "shrink")
// Specifies the delay, in seconds, between replicated copies. Animatable.
replicatorLayer.instanceDelay = duration/Double(nrDots)
// The transform applied to the layer’s contents. Animatable.
dot.transform = CATransform3DMakeScale(0.01, 0.01, 0.01)
}
// connecting the breathe in label
@IBOutlet weak var label: UILabel!
// instant delay
@IBOutlet weak var instantDelay: UIButton!
@IBAction func delayBtn(_ sender: Any) {
dot.removeAnimation(forKey: "shrink")
timer1.invalidate()
seconds = 0
timer2.invalidate()
timerclock.text = "\(seconds)"
time = 0
timerLabel.text = "Breathe in"
timerisOn = false
pauseBtn.isHidden = true
playBtn.isHidden = false
label.isHidden = true
replicatorLayer.isHidden = true
instantDelay.isHidden = true
instantDelay1.isHidden = false
slider.isHidden = false
}
// Delay 1
@IBOutlet weak var instantDelay1: UIButton!
@IBAction func delayBtn1(_ sender: Any) {
instantDelay1.isHidden = true
instantDelay.isHidden = false
label.isHidden = false
slider.isHidden = true
}
//Slider for changing animation speed
@IBOutlet weak var slider: UISlider!
@IBAction func slider(_ sender: Any) {
}
@IBAction func speed(_ sender: UISlider) {
view.layer.speed = sender.value
}
//Sound On button
@IBOutlet weak var soundOn: UIButton!
@IBAction func SoundOn(_ sender: Any) {
meditationState = .on
setTrackForPlayerWith(trackName: "Mute")
player.play()
soundoff.isHidden = false
soundOn.isHidden = true
}
//Sound Off button
@IBOutlet weak var soundoff: UIButton!
@IBAction func SoundOff(_ sender: Any) {
meditationState = .off
setTrackForPlayerWith(trackName: "Bigsur")
player.play()
soundoff.isHidden = true
soundOn.isHidden = false
}
//Timerclock at top of screen label
@IBOutlet weak var timerclock: UILabel!
// creating vars to set things
var animation = CFTimeInterval()
var timer1 = Timer()
var timer2 = Timer()
var time = 0
var seconds = 0
var timerisOn = false
// connecting breathe in label
@IBOutlet var question: UILabel!
var arrayOfStrings: [String] = [""]
// connecting timerclick and starting it
@IBOutlet var timerLabel: UILabel!
// changes the amount of time on the label of different labels
func increaseTimer() {
time += 1
switch time {
case 0 ... 7:
timerLabel.text = "Hold"
case 8 ... 10:
timerLabel.text = "Breathe Out"
case 11 ... 12:
timerLabel.text = "Breathe in"
default:
time = 0
}
}
// connecting the play button and vars
@IBOutlet weak var playBtn: UIButton!
@IBAction func play(sender: AnyObject) {
bell(trackName: "Bell")
player1.play()
timer1 = Timer.scheduledTimer(timeInterval: 1, target: self, selector: #selector(ViewController3.increaseTimer), userInfo: nil, repeats: true)
pauseBtn.isHidden = false
playBtn.isHidden = true
if timerisOn == false {
timer2 = Timer.scheduledTimer(timeInterval: 1, target: self, selector: #selector(updateTimer), userInfo: nil, repeats: true)
timerisOn = true
}
animation2()
}
// pausing the timer with the vars
@IBOutlet weak var pauseBtn: UIButton!
@IBAction func pause(sender: AnyObject) {
dot.removeAnimation(forKey: "shrink")
timer1.invalidate()
seconds = 0
timer2.invalidate()
timerclock.text = "\(seconds)"
time = 0
timerLabel.text = "Breathe in"
timerisOn = false
pauseBtn.isHidden = true
playBtn.isHidden = false
}
override func viewDidAppear(_ animated: Bool) {
super.viewDidAppear( animated)
meditationState = .on
setTrackForPlayerWith(trackName: "Bigsur")
player.play()
player.numberOfLoops = -1
}
override func viewDidLoad() {
super.viewDidLoad()
time += 1
do {
try AVAudioSession.sharedInstance().setCategory(AVAudioSessionCategoryAmbient)
print("AVAudioSession Category Playback OK")
do {
try AVAudioSession.sharedInstance().setActive(true)
print("AVAudioSession is Active")
} catch let error as NSError {
print(error.localizedDescription)
}
} catch let error as NSError {
print(error.localizedDescription)
}
}
func setTrackForPlayerWith(trackName: String) {
do
{
let audioPath = Bundle.main.path(forResource: trackName, ofType: "mp3")
try player = AVAudioPlayer(contentsOf: NSURL(fileURLWithPath: audioPath!) as URL)
}
catch
{
//ERROR
}
}
func bell(trackName: String) {
do
{
let audioPath = Bundle.main.path(forResource: trackName, ofType: "mp3")
try player1 = AVAudioPlayer(contentsOf: NSURL(fileURLWithPath: audioPath!) as URL)
}
catch
{
//ERROR
}
}
override func didReceiveMemoryWarning() {
super.didReceiveMemoryWarning()
// Dispose of any resources that can be recreated.
}
}
答案 0 :(得分：1)
您在寻找viewWillDisappear(_:)吗？在该方法中，您只需添加player.stop()即可在更改视图时停止播放音乐。
答案 1 :(得分：1)
聪明的做法就是....
让我们说这是一张垂直的桌子。
1。每个表格视图单元格都有一个与之关联的音轨。想想一个特定的单元格 - C - 它有一个音轨A。
2. 当视图滚动时（即，无论何时移动），只需获取C的框架
3。只需走高度。然后取屏幕SH的高度。然后从屏幕中心得到C的距离..所以Abs（SH - H）。然后将该数字作为SH的一小部分（零到一）。所以，Abs（SH - H）/ H
（根据您的情况，如果将其除以单元格的高度而不是屏幕高度，可能会更好。）
4. 现在......只需将所有音轨A的音量设置为该分数即可。事实上，只需为每个细胞做到这一点。
滚动时，音频将在各种音轨之间混音。
“魔术”：）
答案 2 :(得分：0)
您可以在各种委托方法中观察UIScrollView子类中所做的更改。
首先，让我们确保将scrollView的委托分配给viewController。为此，可以选择将以下内容添加到viewDidLoad()
// `scrollView` should be whatever is your scrollView called in your VC
self.scrollView.delegate = self
完成此操作后，让我们的UIViewController子类符合UIScrollViewDelegate
class ViewController: UIViewController, UIScrollViewDelegate {
func scrollViewDidScroll(_ scrollView: UIScrollView) {
if scrollView.contentOffset.x > self.view.frame.size.x {
player.stop()
}
}
}
UIScrollViewDelegate有许多方法可以观察scrollView中的更改。每次与scrollView进行交互时都会调用scrollViewDidScroll(_:)，因此只要contentOffset大于视图宽度，就可以停止播放音乐。