线程1：致命错误：索引超出范围spritekit

Question

我正在游戏中制作动画。但是，我不断得到：

  

线程1：致命错误：索引超出范围

上：

mIndex.advanced(by: Double(Splits[state.hashValue]))

代码：

  enum States:Int {
        case idle = 0
        case running = 1
        case stopping = 2
        case jumping = 3
        case falling = 4
        case holding = 5
     }

var state: States
var Splits: [Int]
var mIndex = Double()

func animate() {
    if self.body != nil {
        if(state == .running) {
            mIndex = max(mIndex, Double(Splits[1]))
            mIndex += 0.2

            if (mIndex >= Double(Splits[2])) {
                mIndex = Double(Splits[1])
            }
        } else {
            mIndex.advanced(by: Double(Splits[state.hashValue]))                
            //Thread 1: Fatal error: Index out of range
            // mIndex = Double(Splits[state.hashValue]) //also tried but still same error 
        }
    }

起初我做到了：

mIndex = Double(Splits[state.hashValue])

但我仍然得到：

  

线程1致命错误索引超出范围

然后，我研究了该错误，并建议使用advanced(by:)。但是，它没有帮助。

我也做了：

mIndex.advanced(by: Double(Splits[state.rawValue]))