如何在 AudioPlayerViewController 中显示图像？
[英]How to display image in AudioPlayerViewController?
问题描述
这是带有音频列表的 TableViewController。 它成功地从 firebase 中抓取所有数据并显示在表格中。 我包括一个截图
import UIKit
import AVKit
import AVFoundation
import FirebaseFirestore
import Combine
import SDWebImage
class ListOfAudioLessonsTableViewController: UIViewController, UITableViewDelegate, UITableViewDataSource {
@IBOutlet var table: UITableView!
let placeHolderImage = UIImage(named: "placeHolderImage")
private var viewModel = AudiosViewModel()
private var cancellable: AnyCancellable?
override func viewDidLoad() {
super.viewDidLoad()
self.viewModel.fetchData()
self.title = "Audio Lessons"
table.delegate = self
table.dataSource = self
cancellable = viewModel.$audios.sink { _ in
DispatchQueue.main.async{
self.table.reloadData()
}
} // Do any additional setup after loading the view.
}
// Table
func tableView(_ tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
print("audios count = ", viewModel.audios.count)
return viewModel.audios.count
}
func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {
let cell = tableView.dequeueReusableCell(withIdentifier: "Cell", for: indexPath)
let song = viewModel.audios[indexPath.row]
tableView.tableFooterView = UIView()
cell.textLabel?.text = song.albumName
cell.detailTextLabel?.text = song.name
cell.accessoryType = .disclosureIndicator
let imageURL = song.audioImageName
cell.imageView?.sd_imageIndicator = SDWebImageActivityIndicator.gray
cell.imageView?.sd_setImage(with: URL(string: imageURL),
placeholderImage: placeHolderImage,
options: SDWebImageOptions.highPriority,
context: nil,
progress: nil,
completed: { downloadedImage, downloadException, cacheType, downloadURL in
if let downloadException = downloadException {
print("error downloading the image: \(downloadException.localizedDescription)")
} else {
print("successfuly downloaded the image: \(String(describing: downloadURL?.absoluteString))")
}
})
cell.textLabel?.numberOfLines = 0
cell.detailTextLabel?.numberOfLines = 0
let backgroundView = UIView()
backgroundView.backgroundColor = UIColor(named: "AudioLessonsCellHighlighted")
cell.selectedBackgroundView = backgroundView
cell.textLabel?.font = UIFont(name: "Helvetica-Bold", size: 14)
cell.detailTextLabel?.font = UIFont(name: "Helvetica", size: 12)
return cell
}
func tableView(_ tableView: UITableView, heightForRowAt indexPath: IndexPath) -> CGFloat {
return 100
}
func tableView(_ tableView: UITableView, didSelectRowAt indexPath: IndexPath) {
tableView.deselectRow(at: indexPath, animated: true)
// present the player
let position = indexPath.row
//lessons
guard let vc = storyboard?.instantiateViewController(identifier: "AudioPlayer") as? AudioPlayerViewController else {
return
}
vc.paragraphs = viewModel.audios
vc.position = position
present(vc, animated: true)
}
func tableView(_ tableView: UITableView, didHighlightRowAt indexPath: IndexPath) {
if let cell = tableView.cellForRow(at: indexPath) {
cell.contentView.backgroundColor = UIColor(named: "AudioLessonsHighlighted")
cell.textLabel?.highlightedTextColor = UIColor(named: "textHighlighted")
cell.detailTextLabel?.highlightedTextColor = UIColor(named: "textHighlighted")
}
}
func tableView(_ tableView: UITableView, didUnhighlightRowAt indexPath: IndexPath) {
if let cell = tableView.cellForRow(at: indexPath) {
cell.contentView.backgroundColor = nil
}
}
}
这是 AudioPlayerViewController。 它成功地播放了从 firbase 抓取的链接中的音频。 它显示所有标签，但不显示图像。 图像也应根据用户选择的行从 firebase 下载。 我成功下载并在 tableviewcontroller 中显示图像，但无法显示 AudioPlayerViewController，我的问题是：如何在 AudioPlayerViewController 的 AlbumImageview 中显示来自 firebase 的图像？ 我包括一个截图
import UIKit
import AVFoundation
import MediaPlayer
import AVKit
import Combine
import SDWebImage
class AudioPlayerViewController: UIViewController {
private var viewModel = AudiosViewModel()
public var position: Int = 0
public var paragraphs: [Audio] = []
let placeHolderImage = UIImage(named: "placeHolderImage")
@IBOutlet var holder: UIView!
var player: AVPlayer?
var playerItem: AVPlayerItem?
var isSeekInProgress = false
var chaseTime = CMTime.zero
fileprivate let seekDuration: Float64 = 15
var playerCurrentItemStatus: AVPlayerItem.Status = .unknown
// User Interface elements
private let albumImageView: UIImageView = {
let imageView = UIImageView()
imageView.contentMode = .scaleAspectFill
return imageView
}()
private let paragraphNumberLabel: UILabel = {
let label = UILabel()
label.textAlignment = .left
label.font = .systemFont(ofSize: 16, weight: .light)
label.numberOfLines = 0 // allow line wrap
label.textColor = UIColor(named: "PlayerColors")
return label
}()
private let albumNameLabel: UILabel = {
let label = UILabel()
label.textAlignment = .left
label.font = .systemFont(ofSize: 18, weight: .bold)
label.numberOfLines = 0 // allow line wrap
label.textColor = UIColor(named: "PlayerColors")
return label
}()
private let songNameLabel: UILabel = {
let label = UILabel()
label.textAlignment = .left
label.font = .systemFont(ofSize: 16, weight: .ultraLight)
label.numberOfLines = 0 // allow line wrap
label.textColor = UIColor(named: "PlayerColors")
return label
}()
private let elapsedTimeLabel: UILabel = {
let label = UILabel()
label.textAlignment = .left
label.font = .systemFont(ofSize: 12, weight: .light)
label.textColor = UIColor(named: "PlayerColors")
label.text = "00:00"
label.numberOfLines = 0
return label
}()
private let remainingTimeLabel: UILabel = {
let label = UILabel()
label.textAlignment = .left
label.font = .systemFont(ofSize: 12, weight: .light)
label.textColor = UIColor(named: "PlayerColors")
label.text = "00:00"
label.numberOfLines = 0
return label
}()
private let playbackSlider: UISlider = {
let v = UISlider()
v.addTarget(AudioPlayerViewController.self, action: #selector(progressScrubbed(_:)), for: .valueChanged)
v.minimumTrackTintColor = UIColor.lightGray
v.maximumTrackTintColor = UIColor.darkGray
v.thumbTintColor = UIColor(named: "PlayerColors")
v.minimumValue = 0
v.isContinuous = true
return v
}()
let playPauseButton = UIButton()
override func viewDidLoad() {
super.viewDidLoad()
let panGesture = UIPanGestureRecognizer(target: self, action: #selector(panGesture(gesture:)))
self.playbackSlider.addGestureRecognizer(panGesture)
let audioSession = AVAudioSession.sharedInstance()
do {
try audioSession.setCategory(AVAudioSession.Category.playback)
}
catch{
print(error)
}
}
override func viewDidLayoutSubviews() {
super.viewDidLayoutSubviews()
if holder.subviews.count == 0 {
configure()
}
}
func configure() {
// set up player
let song = paragraphs[position]
let url = URL(string: song.trackURL)
let playerItem: AVPlayerItem = AVPlayerItem(url: url!)
do {
try AVAudioSession.sharedInstance().setMode(.default)
try AVAudioSession.sharedInstance().setActive(true, options: .notifyOthersOnDeactivation)
guard url != nil else {
print("urls string is nil")
return
}
player = AVPlayer(playerItem: playerItem)
let duration : CMTime = playerItem.asset.duration
let seconds : Float64 = CMTimeGetSeconds(duration)
remainingTimeLabel.text = self.stringFromTimeInterval(interval: seconds)
let currentDuration : CMTime = playerItem.currentTime()
let currentSeconds : Float64 = CMTimeGetSeconds(currentDuration)
elapsedTimeLabel.text = self.stringFromTimeInterval(interval: currentSeconds)
playbackSlider.maximumValue = Float(seconds)
player!.addPeriodicTimeObserver(forInterval: CMTimeMakeWithSeconds(1, preferredTimescale: 1), queue: DispatchQueue.main) { (CMTime) -> Void in
if self.player!.currentItem?.status == .readyToPlay {
let time : Float64 = CMTimeGetSeconds(self.player!.currentTime());
self.playbackSlider.value = Float(time)
self.elapsedTimeLabel.text = self.stringFromTimeInterval(interval: time)
}
let playbackLikelyToKeepUp = self.player?.currentItem?.isPlaybackLikelyToKeepUp
if playbackLikelyToKeepUp == false{
print("IsBuffering")
self.playPauseButton.isHidden = true
} else {
// stop the activity indicator
print("Buffering completed")
self.playPauseButton.isHidden = false
}
}
playbackSlider.addTarget(self, action: #selector(AudioPlayerViewController.progressScrubbed(_:)), for: .valueChanged)
self.view.addSubview(playbackSlider)
//subroutine used to keep track of current location of time in audio file
guard let player = player else {
print("player is nil")
return
}
player.play()
}
catch {
print("error accured")
}
// set up user interface elements
//album cover
albumImageView.frame = CGRect(x: 20,
y: 20,
width: holder.frame.size.width - 40,
height: holder.frame.size.width - 40)
albumImageView.image = UIImage(named: song.audioImageName)
holder.addSubview(albumImageView)
//Labels Song name, album, artist
albumNameLabel.frame = CGRect(x: 20,
y: holder.frame.size.height - 300,
width: holder.frame.size.width - 40,
height: 20)
paragraphNumberLabel.frame = CGRect(x: 20,
y: holder.frame.size.height - 280,
width: holder.frame.size.width-40,
height: 20)
songNameLabel.frame = CGRect(x: 20,
y: holder.frame.size.height - 260,
width: holder.frame.size.width-40,
height: 20)
playbackSlider.frame = CGRect(x: 20,
y: holder.frame.size.height - 235,
width: holder.frame.size.width-40,
height: 40)
elapsedTimeLabel.frame = CGRect(x: 25,
y: holder.frame.size.height - 200,
width: holder.frame.size.width-40,
height: 15)
remainingTimeLabel.frame = CGRect(x: holder.frame.size.width-60,
y: holder.frame.size.height - 200,
width: holder.frame.size.width-20,
height: 15)
songNameLabel.text = song.name
albumNameLabel.text = song.albumName
paragraphNumberLabel.text = song.paragraphNumber
holder.addSubview(songNameLabel)
holder.addSubview(albumNameLabel)
holder.addSubview(paragraphNumberLabel)
holder.addSubview(elapsedTimeLabel)
holder.addSubview(remainingTimeLabel)
//Player controls
let nextButton = UIButton()
let backButton = UIButton()
let seekForwardButton = UIButton()
let seekBackwardButton = UIButton()
//frames of buttons
playPauseButton.frame = CGRect(x: (holder.frame.size.width - 40) / 2.0,
y: holder.frame.size.height - 172.5,
width: 40,
height: 40)
nextButton.frame = CGRect(x: holder.frame.size.width - 70,
y: holder.frame.size.height - 162.5,
width: 30,
height: 20)
backButton.frame = CGRect(x: 70 - 30,
y: holder.frame.size.height - 162.5,
width: 30,
height: 20)
seekForwardButton.frame = CGRect(x: holder.frame.size.width - 140,
y: holder.frame.size.height - 167.5,
width: 30,
height: 30)
seekBackwardButton.frame = CGRect(x: 110,
y: holder.frame.size.height - 167.5,
width: 30,
height: 30)
let volumeView = MPVolumeView(frame: CGRect(x: 20,
y: holder.frame.size.height - 80,
width: holder.frame.size.width-40,
height: 30))
holder.addSubview(volumeView)
//actions of buttons
playPauseButton.addTarget(self, action: #selector(didTapPlayPauseButton), for: .touchUpInside)
backButton.addTarget(self, action: #selector(didTapBackButton), for: .touchUpInside)
nextButton.addTarget(self, action: #selector(didTapNextButton), for: .touchUpInside)
seekForwardButton.addTarget(self, action: #selector(seekForwardButtonTapped), for: .touchUpInside)
seekBackwardButton.addTarget(self, action: #selector(seekBackwardButtonTapped), for: .touchUpInside)
//styling of buttons
playPauseButton.setBackgroundImage(UIImage(systemName: "pause.fill"), for: .normal)
nextButton.setBackgroundImage(UIImage(systemName: "forward.fill"), for: .normal)
backButton.setBackgroundImage(UIImage(systemName: "backward.fill"), for: .normal)
seekForwardButton.setBackgroundImage(UIImage(systemName: "goforward.15"), for: .normal)
seekBackwardButton.setBackgroundImage(UIImage(systemName: "gobackward.15"), for: .normal)
playPauseButton.tintColor = UIColor(named: "PlayerColors")
nextButton.tintColor = UIColor(named: "PlayerColors")
backButton.tintColor = UIColor(named: "PlayerColors")
seekForwardButton.tintColor = UIColor(named: "PlayerColors")
seekBackwardButton.tintColor = UIColor(named: "PlayerColors")
holder.addSubview(playPauseButton)
holder.addSubview(nextButton)
holder.addSubview(backButton)
holder.addSubview(seekForwardButton)
holder.addSubview(seekBackwardButton)
}
@objc func panGesture(gesture: UIPanGestureRecognizer) {
let currentPoint = gesture.location(in: playbackSlider)
let percentage = currentPoint.x/playbackSlider.bounds.size.width;
let delta = Float(percentage) * (playbackSlider.maximumValue - playbackSlider.minimumValue)
let value = playbackSlider.minimumValue + delta
playbackSlider.setValue(value, animated: true)
}
@objc func progressScrubbed(_ playbackSlider: UISlider!) {
let seconds : Int64 = Int64(playbackSlider.value)
let targetTime:CMTime = CMTimeMake(value: seconds, timescale: 1)
player!.seek(to: targetTime)
if player!.rate == 0
{
player?.play()
}
}
func setupNowPlaying() {
// Define Now Playing Info
var nowPlayingInfo = [String : Any]()
nowPlayingInfo[MPMediaItemPropertyTitle] = "Unstoppable"
if let image = UIImage(named: "artist") {
nowPlayingInfo[MPMediaItemPropertyArtwork] = MPMediaItemArtwork(boundsSize: image.size) { size in
return image
}
}
nowPlayingInfo[MPNowPlayingInfoPropertyElapsedPlaybackTime] = player?.currentTime
nowPlayingInfo[MPMediaItemPropertyPlaybackDuration] = playerItem?.duration
nowPlayingInfo[MPNowPlayingInfoPropertyPlaybackRate] = player?.rate
// Set the metadata
MPNowPlayingInfoCenter.default().nowPlayingInfo = nowPlayingInfo
}
func updateNowPlaying(isPause: Bool) {
// Define Now Playing Info
var nowPlayingInfo = MPNowPlayingInfoCenter.default().nowPlayingInfo!
nowPlayingInfo[MPNowPlayingInfoPropertyElapsedPlaybackTime] = player?.currentTime
nowPlayingInfo[MPNowPlayingInfoPropertyPlaybackRate] = isPause ? 0 : 1
// Set the metadata
MPNowPlayingInfoCenter.default().nowPlayingInfo = nowPlayingInfo
}
func setupNotifications() {
let notificationCenter = NotificationCenter.default
notificationCenter.addObserver(self,
selector: #selector(handleInterruption),
name: AVAudioSession.interruptionNotification,
object: nil)
notificationCenter.addObserver(self,
selector: #selector(handleRouteChange),
name: AVAudioSession.routeChangeNotification,
object: nil)
}
@objc func handleRouteChange(notification: Notification) {
guard let userInfo = notification.userInfo,
let reasonValue = userInfo[AVAudioSessionRouteChangeReasonKey] as? UInt,
let reason = AVAudioSession.RouteChangeReason(rawValue:reasonValue) else {
return
}
switch reason {
case .newDeviceAvailable:
let session = AVAudioSession.sharedInstance()
for output in session.currentRoute.outputs where output.portType == AVAudioSession.Port.headphones {
print("headphones connected")
DispatchQueue.main.sync {
player?.play()
}
break
}
case .oldDeviceUnavailable:
if let previousRoute =
userInfo[AVAudioSessionRouteChangePreviousRouteKey] as? AVAudioSessionRouteDescription {
for output in previousRoute.outputs where output.portType == AVAudioSession.Port.headphones {
print("headphones disconnected")
DispatchQueue.main.sync {
player?.pause()
}
break
}
}
default: ()
}
}
@objc func handleInterruption(notification: Notification) {
guard let userInfo = notification.userInfo,
let typeValue = userInfo[AVAudioSessionInterruptionTypeKey] as? UInt,
let type = AVAudioSession.InterruptionType(rawValue: typeValue) else {
return
}
if type == .began {
print("Interruption began")
// Interruption began, take appropriate actions
}
else if type == .ended {
if let optionsValue = userInfo[AVAudioSessionInterruptionOptionKey] as? UInt {
let options = AVAudioSession.InterruptionOptions(rawValue: optionsValue)
if options.contains(.shouldResume) {
// Interruption Ended - playback should resume
print("Interruption Ended - playback should resume")
player?.play()
} else {
// Interruption Ended - playback should NOT resume
print("Interruption Ended - playback should NOT resume")
}
}
}
}
@objc func didTapPlayPauseButton() {
if player?.timeControlStatus == .playing {
//pause
player?.pause()
//show play button
playPauseButton.setBackgroundImage(UIImage(systemName: "play.fill"), for: .normal)
//shrink image
UIView.animate(withDuration: 0.2, animations: {
self.albumImageView.frame = CGRect(x: 50,
y: 50,
width: self.holder.frame.size.width - 100,
height: self.holder.frame.size.width - 100)
})
}
else {
//play
player?.play()
//show pause button
playPauseButton.setBackgroundImage(UIImage(systemName: "pause.fill"), for: .normal)
//increase image size
UIView.animate(withDuration: 0.4, animations: {
self.albumImageView.frame = CGRect(x: 20,
y: 20,
width: self.holder.frame.size.width - 40,
height: self.holder.frame.size.width - 40)
})
}
}
private func setupView() {
setupConstraints()
}
private func setupConstraints() {
NSLayoutConstraint.activate([
holder.leadingAnchor.constraint(equalTo: view.leadingAnchor),
holder.trailingAnchor.constraint(equalTo: view.trailingAnchor),
holder.topAnchor.constraint(equalTo: view.topAnchor),
holder.bottomAnchor.constraint(equalTo: view.bottomAnchor),
])
}
override func viewDidAppear(_ animated: Bool) {
super.viewDidAppear(animated)
player?.play()
UIApplication.shared.isIdleTimerDisabled = true
}
override func viewDidDisappear(_ animated: Bool) {
super.viewDidDisappear(animated)
player?.pause()
UIApplication.shared.isIdleTimerDisabled = false
}
}
这是Adio的结构
import Foundation
struct Audio {
let name: String
let albumName: String
let paragraphNumber: String
let audioImageName: String
let trackURL: String
}
这是 AudiosViewModel
import Foundation
import FirebaseFirestore
class AudiosViewModel: ObservableObject {
@Published var audios = [Audio]()
private var db = Firestore.firestore()
func fetchData() {
db.collection("audios").addSnapshotListener { [self] (querySnapshot, error) in
guard let documents = querySnapshot?.documents else {
print("No Documents")
return
}
self.audios = documents.map { (queryDocumentSnapshot) -> Audio in
let data = queryDocumentSnapshot.data()
let name = data["name"] as? String ?? ""
let albumName = data["albumName"] as? String ?? ""
let audioImageName = data["audioImageName"] as? String ?? ""
let paragraphNumber = data["paragraphNumber"] as? String ?? ""
let trackURL = data["trackURL"] as? String ?? ""
print(data)
return Audio(name: name, albumName: albumName, paragraphNumber: paragraphNumber, audioImageName: audioImageName, trackURL: trackURL)
}
}
}
}
1 个解决方案
解决方案1
0 2022-09-27 20:53:58
在使用数据填充单元格的视图 model 中，添加image属性。
var image: UIImage?
在获取图像的cellForRowAt中，除了将图像注入单元格之外，还将其保存到视图 model 中。
var song = viewModel.audios[indexPath.row]
song.image = fetchedImage
将图像属性添加到AudioPlayerViewController视图 controller。
var mainImage = UIImage(named: "placeHolderImage")
在didSelectRowAt中，在呈现之前使用来自 model 的图像注入详细视图 controller。
vc.mainImage = viewModel.image
present(vc, animated: true)
如果之前的视图controller刚刚下载的镜像就不需要重新下载了。 只需扩展您的视图 model 以包含此图像并在需要呈现时将其传递。
如何使用 flutter 和 firebase 在 Firestore 中使用 URL 作为字符串在 App 中显示图像
[英]How to display Image in App with flutter and firebase using URL as String in Firestore
如何使用 PHP 在我的网站上显示来自 AWS S3 存储桶的图像或视频文件
[英]How to display image or video file from AWS S3 bucket on my website using PHP
声明:本站的技术帖子网页，遵循CC BY-SA 4.0协议，如果您需要转载，请注明本站网址或者原文地址。任何问题请咨询:yoyou2525@163.com.
相关问题
如何显示来自 firebase 的图像？
如何将图像存储在 flutter 火库中并显示它
flutter中如何显示和更新多张图片
如何使用 flutter 和 firebase 在 Firestore 中使用 URL 作为字符串在 App 中显示图像
如何使用 PHP 显示来自 Amazon S3 的图像？
如何在刀片 laravel 5.2 中显示来自 aws s3 的图像
图像不显示
如何获取 Firebase 值并在 Android 应用程序上显示图像
如何使用 PHP 在我的网站上显示来自 AWS S3 存储桶的图像或视频文件
显示来自 imagepicker 和 firestore flutter 的图像
相关标签