将元组追加到元组数组 [英] Appending tuples to an array of tuples

问题描述

我的课宣告了一个数组

var laps: (start: NSDate!, end: NSDate!)[] = []

将元组添加到此数组后，我希望能够执行类似的操作

When a tuple is added to this array I'd like to be able to do something like

let now = NSDate()
var lap = (now, nil)
laps.append(lap)

但是在append处出现错误Missing argument for parameter 'end' in call.

推荐答案

我尝试遵循，但从语法上看它是正确的:

I've tried to following, and it looked correct syntactically:

typealias MyTuple = (start: NSDate!, end: NSDate?)

然后在该方法中，我做到了:

then in the method, I did:

var laps: Array<MyTuple> = Array()
laps.append((NSDate.date(), nil))

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