AudioKit MIDIListener 强制我覆盖它的协议

Question

嗨，我是 AudioKit 的新手

我试着跟着playground写了一个简单的midi listener https://github.com/AudioKit/AudioKit/blob/v5-master/Playgrounds/Playback.playground/Pages/MIDI%20Input.xcplaygroundpage/Contents.swift

但是，当我创建“class MIDIReceiver: MIDIListener”时，我无法将其内部留空，xcode 要求我重写函数。 “类型 'MIDIReceiver' 不符合协议 'MIDIListener'”

截图在这里 https://i.stack.imgur.com/kUtBs.jpg

我真的需要覆盖它们吗？或者funcs的那些参数怎么填？

谢谢

--- 添加于 10 月 21 日 ---

我想我明白了...

目前的方法是：

class MIDIReceiver: MIDIListener {
func receivedMIDINoteOn(noteNumber: MIDINoteNumber, velocity: MIDIVelocity, channel: MIDIChannel, portID: MIDIUniqueID?, offset: MIDITimeStamp) {
    <#code#>
}

func receivedMIDINoteOff(noteNumber: MIDINoteNumber, velocity: MIDIVelocity, channel: MIDIChannel, portID: MIDIUniqueID?, offset: MIDITimeStamp) {
    <#code#>
}

func receivedMIDIController(_ controller: MIDIByte, value: MIDIByte, channel: MIDIChannel, portID: MIDIUniqueID?, offset: MIDITimeStamp) {
    <#code#>
}

func receivedMIDIAftertouch(noteNumber: MIDINoteNumber, pressure: MIDIByte, channel: MIDIChannel, portID: MIDIUniqueID?, offset: MIDITimeStamp) {
    <#code#>
}

func receivedMIDIAftertouch(_ pressure: MIDIByte, channel: MIDIChannel, portID: MIDIUniqueID?, offset: MIDITimeStamp) {
    <#code#>
}

func receivedMIDIPitchWheel(_ pitchWheelValue: MIDIWord, channel: MIDIChannel, portID: MIDIUniqueID?, offset: MIDITimeStamp) {
    <#code#>
}

func receivedMIDIProgramChange(_ program: MIDIByte, channel: MIDIChannel, portID: MIDIUniqueID?, offset: MIDITimeStamp) {
    <#code#>
}

func receivedMIDISystemCommand(_ data: [MIDIByte], portID: MIDIUniqueID?, offset: MIDITimeStamp) {
    <#code#>
}

func receivedMIDISetupChange() {
    <#code#>
}

func receivedMIDIPropertyChange(propertyChangeInfo: MIDIObjectPropertyChangeNotification) {
    <#code#>
}

func receivedMIDINotification(notification: MIDINotification) {
    <#code#>
}

}

Xcode 说“在范围内找不到类型“MIDITimeStamp”、“MIDIUniqID”和“MIDINotification”

导入CoreMIDI后，没有报错

谢谢

Answer 1

只需点击红色圆圈并按“修复”，它就会为您添加所有协议方法。然后你可以将代码放入你需要的代码中。所有的协议方法都是必需的，因为当使事情成为可选的（或创建执行默认操作的协议的扩展）时，结果是如果我们更新协议而开发人员忽略更新，他们将失去他们的 midi 功能。现在，如果我们更改内容，您必须保持最新状态。

AudioKit MIDIListener 强制我覆盖它的协议

AudioKit MIDIListener force me to override its protocol

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audiokit