SwiftUI视频播放器如何设置url
SwiftUI视频播放器如何设置url
提问于 2021-03-22 20:36:52
我正在尝试创建一个视图，允许我发送我想播放的视频的URL。我的看法如下：
import SwiftUI
import AVKit
struct PlayerView: View {
var videoURL : String
private let player = AVPlayer(url: URL(string: "https://bitdash-a.akamaihd.net/content/sintel/hls/playlist.m3u8")!)
var body: some View {
VideoPlayer(player: player)
.onAppear() {
// Start the player going, otherwise controls don't appear
player.play()
}
.onDisappear() {
// Stop the player when the view disappears
player.pause()
}
}
}如果尝试将URL设置为传递的参数，则会得到以下错误：
Cannot use instance member 'videoURL' within property initializer; property initializers run before 'self' is available如何将aURL传递到视图以播放不同的电影？
我按建议修改了代码，视频没有播放：
import SwiftUI
import AVKit
struct PlayerView: View {
var videoURL : String
@State private var player : AVPlayer?
var body: some View {
VideoPlayer(player: player)
.onAppear() {
// Start the player going, otherwise controls don't appear
guard let url = URL(string: videoURL) else {
return
}
print(url)
let player = AVPlayer(url: url)
self.player = player
self.player?.seek(to: CMTime.zero)
self.player!.play()
}
.onDisappear() {
// Stop the player when the view disappears
player?.pause()
}
}
}我在试着改变计时器上的视频。我试过这个：
} else {
VideoPlayer(player: viewModel.player)
.onAppear {
viewModel.urlString = "https://testsite.neumont.edu/images/green.mp4"
}
.onReceive(movieSwitchTimer) { _ in
DispatchQueue.main.asyncAfter(deadline: .now() + 5) {
viewModel.urlString = "https://testsite.neumont.edu/images/earth.mp4"
}
self.activeImageIndex = (self.activeImageIndex + 1) % slideStore.images.count
}
}回答 1
Stack Overflow用户
回答已采纳
发布于 2021-03-22 21:07:33
实现这一目标的方法有很多种，但是由于您已经在使用onAppear，这似乎是实现这一目标的好地方：
struct PlayerView: View {
var videoURL : String
@State private var player : AVPlayer?
var body: some View {
VideoPlayer(player: player)
.onAppear() {
// Start the player going, otherwise controls don't appear
guard let url = URL(string: videoURL) else {
return
}
let player = AVPlayer(url: url)
self.player = player
player.play()
}
.onDisappear() {
// Stop the player when the view disappears
player?.pause()
}
}
}您希望player是@State，因为它应该在视图的呈现之间持久化。
基于注释的更新，处理可能更改的场景
class VideoViewModel : ObservableObject {
@Published var urlString : String? {
didSet {
guard let urlString = urlString, let url = URL(string: urlString) else {
return
}
player = AVPlayer(url: url)
player.seek(to: .zero)
player.play()
}
}
var player = AVPlayer()
}
struct ContentView : View {
@StateObject var viewModel = VideoViewModel()
var body: some View {
VideoPlayer(player: viewModel.player)
.onAppear {
viewModel.urlString = "https://bitdash-a.akamaihd.net/content/sintel/hls/playlist.m3u8"
DispatchQueue.main.asyncAfter(deadline: .now() + 5) {
viewModel.urlString = Bundle.main.url(forResource: "IMG_0226", withExtension: "mp4")!.absoluteString
}
}
}
}在更新中，您可以看到我将播放机存储在ObservableObject中。当url字符串被更改时，它会重新加载播放机。onAppear在您的代码中是不必要的--它只是在不同时间显示加载不同视频的一种方式(第一个是您提供的URL，第二个是来自我包的URL )。
页面原文内容由Stack Overflow提供。腾讯云小微IT领域专用引擎提供翻译支持
原文链接：
https://stackoverflow.com/questions/66753505
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