xcode Swift 2.0 映射“实例成员不能用于类型”
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Swift 2.0 Map "Instance member cannot be used on type"
提问by Sole
I am trying to learn how to create a FFT using swift 2.0 however i am having trouble getting the .map function to compile.
我正在尝试学习如何使用 swift 2.0 创建 FFT，但是我无法编译 .map 函数。
The following code works in a playground but not inside xCode as a member of a swift class.
以下代码在操场上工作，但在 xCode 中作为 swift 类的成员不工作。
I get the following error "Instance member 'sineArraySize' cannot be used on type 'FFTAnalyser'
我收到以下错误“实例成员 'sineArraySize' 不能用于类型 'FFTAnalyser'
import Foundation
import Accelerate
class FFTAnalyser {
let sineArraySize = 64 // Should be power of two for the FFT
let frequency1 = 4.0
let phase1 = 0.0
let amplitude1 = 2.0
var sineWave = (0..<sineArraySize).map {
amplitude1 * sin(2.0 * M_PI / Double(sineArraySize) * Double(var sineWave : [Double] = []
init() {
sineWave = (0..<sineArraySize).map {
amplitude1 * sin(2.0 * M_PI / Double(sineArraySize) * Double(##代码##) * frequency1 + phase1)
}
}
) * frequency1 + phase1)
}
func plotArray<T>(arrayToPlot:Array<T>) {
for x in arrayToPlot {
print(x)
}
}
}
Any help would be much appreciated. Thanks
任何帮助将非常感激。谢谢
采纳答案by Kametrixom
The error is because sineWavetries to access the selfproperty sineArraySizeand others before selfwas initialized (initialization happens after defining the values for properties). To work around this, you can do this:
错误是因为在初始化之前sineWave尝试访问self属性sineArraySize和其他属性self（初始化发生在定义属性值之后）。要解决此问题，您可以执行以下操作：
