How to declare and initialise an array in Swift

问题

I have a class in Swift that I'm trying to write that has a variable of an array of objects. Is there a better way to write this?

var myvar: Array<MyClass> = Array<MyClass>()

Without the bit after the = sign, the compiler complains about my AppDelegate having no initializers. The above way seems a bit lengthy (though it's no more terse than the c# equivalent, I guess). I'd just like to know if there's a shortcut. Thanks.

回答1:

You can initialize the variable with an empty array:

var myvar: Array<MyClass> = []

or use automatic type inference:

var myvar = Array<MyClass>()

In addition, you can write Array<MyClass> as [MyClass].

回答2:

To create an empty array or dictionary, use the initialiser syntax.

let emptyArray = [String]()
let emptyDictionary = [String: Float]()

let individualScores = [75, 43, 103, 87, 12]

let interestingNumbers = [
    "Prime": [2, 3, 5, 7, 11, 13],
    "Fibonacci": [1, 1, 2, 3, 5, 8],
    "Square": [1, 4, 9, 16, 25],
]

来源：https://stackoverflow.com/questions/25718596/how-to-declare-and-initialise-an-array-in-swift