Arrays 表达式类型不明确，没有typealias数组的更多上下文

我试图创建一个typealias对象的数组数组，但得到了一个“表达式类型不明确，没有更多上下文”编译错误。 这是我的密码：

typealias TestClosure = ((message: String)->())
var testArray = [[TestClosure]](count: 4, repeatedValue: nil)

我错过了什么

更新：

typealias TestClosure = (String) -> ()
var testArray = [[TestClosure]](repeating: [], count: 4)

typealias TestClosure = ((message: String) -> ())
var testArray = [[TestClosure]](count: 4, repeatedValue: [])

结果表明，当数组数组是optionals数组时，它会编译：

var testArray = [[TestClosure]?](count: 4, repeatedValue: nil)

但是-我想确保初始数组将包含实际的空数组。

---

我该怎么做呢？

Swift 2

使用

repeatedValue

创建空数组：

var testArray = Array(count: 4, repeatedValue: [TestClosure]())

Swift 3

语法发生了变化，但想法是一样的：

var testArray = Array(repeating: [TestClosure](), count: 4)

---

Swift 2

使用

repeatedValue

创建空数组：

var testArray = Array(count: 4, repeatedValue: [TestClosure]())

Swift 3

语法发生了变化，但想法是一样的：

var testArray = Array(repeating: [TestClosure](), count: 4)

---

使用

[]

创建空数组，而不是

nil

：

Swift 3:

typealias TestClosure = (String) -> ()
var testArray = [[TestClosure]](repeating: [], count: 4)

typealias TestClosure = ((message: String) -> ())
var testArray = [[TestClosure]](count: 4, repeatedValue: [])

Swift 2:

typealias TestClosure = (String) -> ()
var testArray = [[TestClosure]](repeating: [], count: 4)

typealias TestClosure = ((message: String) -> ())
var testArray = [[TestClosure]](count: 4, repeatedValue: [])

---

使用

[]

创建空数组，而不是

nil

：

Swift 3:

typealias TestClosure = (String) -> ()
var testArray = [[TestClosure]](repeating: [], count: 4)

typealias TestClosure = ((message: String) -> ())
var testArray = [[TestClosure]](count: 4, repeatedValue: [])

Swift 2:

typealias TestClosure = (String) -> ()
var testArray = [[TestClosure]](repeating: [], count: 4)

typealias TestClosure = ((message: String) -> ())
var testArray = [[TestClosure]](count: 4, repeatedValue: [])