我如何在swift2中创建[String:AnyObject]数组 [英] How can i create a [String : AnyObject] array in swift2

问题描述

此代码段可与swift一起使用，但不能与swift2一起编译.

This code snippet worked with swift but does not compile with swift2.

let settings = [
    AVFormatIDKey: kAudioFormatLinearPCM,
    AVSampleRateKey: 44100.0,
    AVNumberOfChannelsKey: 1,
    AVLinearPCMBitDepthKey: 16,
    AVLinearPCMIsBigEndianKey: true
]

let audioFile = AVAudioFile(forWriting:url, settings:settings, error:&error)

我收到没有更多上下文的表达式类型不明确"错误.如果我将分配更改为[String:Any]，则会在AVAudioFile上收到错误消息，因为它期望使用[String:AnyObject]数组.

I get a "Type of expression is ambiguous without more context" error. If i change the assignment to [String : Any] i get a error at AVAudioFile because it expects a [String : AnyObject] array.

let settings:[String : Any] = [
   AVFormatIDKey: kAudioFormatLinearPCM,
    AVSampleRateKey: 44100.0,
    AVNumberOfChannelsKey: 1,
    AVLinearPCMBitDepthKey: 16,
    AVLinearPCMIsBigEndianKey: true
]

let audioFile = try! AVAudioFile(forWriting:url, settings:settings)

有人知道如何在swift2中创建[String:AnyObject]数组吗?

Does anyone know how to create [String : AnyObject] array in swift2?

推荐答案

kAudioFormatLinearPCM是一个UInt32，但是Swift 2想要一个Int来代替:

kAudioFormatLinearPCM was an UInt32 but Swift 2 wants an Int instead:

let settings: [String:AnyObject] = [
    AVFormatIDKey: Int(kAudioFormatLinearPCM),
    AVSampleRateKey: 44100.0,
    AVNumberOfChannelsKey: 1,
    AVLinearPCMBitDepthKey: 16,
    AVLinearPCMIsBigEndianKey: true
]

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