Swift 错误：无法将“ArraySlice”类型的值转换为预期的参数类型

我收到此错误并且是 Swift 新手。我想获取数组 >= 5 的最后 5 个点，并将这 5 个点作为数组参数传递给函数。我怎样才能实现这一点并克服这个错误？

无法将类型“ArraySlice”的值转换为预期参数类型“[CGPoint]”

if (self.points?.count >= 5) {
    let lastFivePoints = self.points![(self.points!.count-5)..<self.points!.count]
    let angle = VectorCalculator.angleWithArrayOfPoints(lastFivePoints)
}

你需要转换ArraySlice to Array使用方法Array(Slice<Type>)

if (self.points?.count >= 5) {
    let lastFivePoints = Array(self.points![(self.points!.count-5)..<self.points!.count])
    let angle = VectorCalculator.angleWithArrayOfPoints(lastFivePoints)
}