相关疑难解决方法(0)

我想在此方法中的块中重新加载我的表数据:

import UIKit
import AssetsLibrary

class AlbumsTableViewController: UITableViewController {

    var albums:ALAssetsGroup[] = []

    func loadAlbums(){
        let library = IAAssetsLibraryDefaultInstance

        library.enumerateGroupsWithTypes(ALAssetsGroupType(ALAssetsGroupAll),
            usingBlock: {(group, stop) in
                if group {
                    self.albums.append(group)
                }
                else {
                    dispatch_async(dispatch_get_main_queue(), {

                        self.tableView.reloadData()

                    })
                }
            }, failureBlock: { (error:NSError!) in println("Problem loading albums: \(error)") })

    }

    override func viewDidLoad() {
        super.viewDidLoad()
        loadAlbums()

        // Uncomment the following line to preserve selection between presentations
        // self.clearsSelectionOnViewWillAppear = false

        // Uncomment the following line to display an Edit button in the navigation …

这是我在日志中看到的内容:

16:33:20.236: Call is Dialing
16:33:21.088: AVAudioSessionInterruptionNotification
16:33:21.450: AVAudioSessionRouteChangeNotification
16:33:21.450: ....change reason CategoryChange
16:33:21.539: AVAudioEngineConfigurationChangeNotification
16:33:21.542: Starting Audio Engine
16:33:23.863: AVAudioSessionRouteChangeNotification
16:33:23.863: ....change reason OldDeviceUnavailable
16:33:23.860 ERROR:     [0x100a70000] AVAudioIONodeImpl.mm:317: ___ZN13AVAudioIOUnit11GetHWFormatEjPj_block_invoke: required condition is false: hwFormat
*** Terminating app due to uncaught exception 'com.apple.coreaudio.avfaudio', reason: 'required condition is false: hwFormat'

我订阅了两个AVAudioEngineConfigurationChangeNotification,AVAudioSessionInterruptionNotification:

@objc private func handleAudioEngineConfigurationChangeNotification(notification: NSNotification) {
    println2(notification.name)
    makeEngineConnections()
    startEngine()
}

@objc private func handleAudioSessionInterruptionNotification(notification: NSNotification) {
    println2(notification.name)
    if let interruptionType = AVAudioSessionInterruptionType(rawValue: notification.userInfo?[AVAudioSessionInterruptionTypeKey] as! UInt) { …

我正在使用一个SKAudioNode()在我的游戏中播放背景音乐.我有一个播放/暂停功能,一切正常,直到我插入耳机.根本没有声音,当我调用暂停/播放功能时,我收到此错误

AVAudioPlayerNode.mm:333:开始:必需条件为false:_engine-> IsRunning()com.apple.coreaudio.avfaudio',原因:'必需条件为false:_engine-> IsRunning()

有谁知道这意味着什么？

码:

import SpriteKit

class GameScene: SKScene {

let loop = SKAudioNode(fileNamed: "gameloop.mp3")
let play = SKAction.play()
let pause = SKAction.pause()
var isPlaying = Bool()

override func didMoveToView(view: SKView) {  
    loop.runAction(play)
    isPlaying = true
    self.addChild(loop)
}

override func touchesBegan(touches: Set<UITouch>, withEvent event: UIEvent?) {
    _ = touches.first as UITouch!

    for _ in touches {
        if isPlaying {
            loop.runAction(pause)
            isPlaying = false
        } else {
            loop.runAction(play)
            isPlaying = true
        } 
    }
}
}

我有一副带麦克风输入的蓝牙耳机。不使用麦克风，但使用时，输入和输出都强制为 8000kHz。

我的 AVAudioEngine 实例以 8000kHz 模式连接到耳机，除非我进入系统设置并指定我不想使用耳机进行输入（每次连接耳机时都必须执行此操作）。

我注意到其他应用程序可以以预期的 44100kHz 播放，没有任何问题。我的 AVAudioEngine 图中没有输入节点。

如何使 AVAudioEngine 更喜欢以合理的采样率进行连接？