Swift 如何将数组位置数组与零位置联接？

这就是我努力实现的目标：

let a = CLLocation(latitude: 10, longitude: 20)
let b = CLLocation(latitude: 10, longitude: 40)
let c = CLLocation(latitude: 10, longitude: 60)
let d = CLLocation(latitude: 10, longitude: 80)

let aa = [a, b]
let bb = [c, d]

let zero = CLLocation(latitude: 0, longitude: 0)

let cc = [aa, bb].joined(separator: zero)

我需要这样的东西：

let output = [a, b, zero, c, d]

传递给不带参数的调用的参数

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分隔符也必须是数组：

let cc = [aa, bb].joined(separator: [zero])
print(Array(cc))

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更具体地说，传递给joined的值必须与数组中的类型相同，在本例中为[CLLocation]。是否尝试：让cc=[aa，bb]。joinedseparator:[zero]