如何在 swift 3 上使用 MPMediaPickerController？

Posted 2023-03-14

【中文标题】如何在 swift 3 上使用 MPMediaPickerController？

【英文标题】：How to use MPMedaPickerController on swift 3?

【发布时间】：2017-02-12 16:26:27

【问题描述】：

我只是想得到它，以便当您按下按钮时，您会显示用户的音乐库，然后您可以选择一首歌曲。我发现做到这一点的方法是通过MPMediaPickerController，但我一直在努力让它发挥作用。这是我的程序到目前为止的样子：

import MediaPlayer
import UIKit

class ViewController: UIViewController, MPMediaPickerControllerDelegate 
 var mediaPicker: MPMediaPickerController?


override func viewDidLoad() 
     super.viewDidLoad()



@IBAction func showSongs(_ sender: Any) 
    displayMediaPicker()

func displayMediaPicker() 
    mediaPicker = MPMediaPickerController(mediaTypes: .music)
    if let picker = mediaPicker 
        picker.delegate = self
        picker.allowsPickingMultipleItems = false
        picker.showsCloudItems = false
        picker.prompt = "Please Pick a Song" 
        view.addSubview(picker.view)
        

我知道view.addSubview(picker.view) 之后应该有一个属性[self presentViewController:picker animated: true completion:nil]，但是当我输入它时，我有presentingViewController 和presentedViewContoller 选项，但没有presentViewController

任何帮助将不胜感激

【参考方案1】：

函数 presentViewController: animated: completion: 函数在 Swift 3 中被重命名，所以现在看起来像这样：

present(viewControllerToPresent: UIViewController, animated: Bool, completion: (() -> Void)?)

所以，在你的情况下，你最终会得到一个看起来像这样的 presentPicker 函数（注意最后一行）：

func presentPicker() 
    mediaPicker = MPMediaPickerController(mediaTypes: .music)
    if let picker = mediaPicker 
        picker.delegate = self
        picker.allowsPickingMultipleItems = false
        picker.showsCloudItems = false
        picker.prompt = "Please Pick a Song"
        present(picker, animated: false, completion: nil)
    

希望对你有所帮助。

【参考方案2】：

Swift 5、Swift 4 非常简单的解决方案

//MARK:- add it in your info.plist file
<key>NSAppleMusicUsageDescription</key> 
<string>$(app Name) uses music</string>

//MARK:- Import in your file
import MediaPlayer

//MARK:- Import as your Delegates
MPMediaPickerControllerDelegate


//MARK:- Just call this function 
func openAudio()

    let audiopicker = MPMediaPickerController(mediaTypes: .anyAudio)
    audiopicker.prompt = "Audio"
    audiopicker.delegate = self
    audiopicker.allowsPickingMultipleItems = false
    self.present(audiopicker, animated: true, completion: nil)