swift - 更新到 Swift 3 时，参数标签与任何可用的重载错误不匹配

Question

将 Swift 语法转换为最新版本时出现错误:

Argument labels '(_:, fromDate:)' do not match any available overloads

在以下行:

let components = calendar.components(componentOptions, fromDate: NSDate())

作为引用，这是其他常量/变量上下文中的行。

let calendar = NSCalendar.current
        let componentOptions:NSCalendar.Unit = .weekday
        let components = calendar.components(componentOptions, fromDate: NSDate())
        var weekday = components.weekday

        let days = ["S", "S", "M", "T", "W", "T", "F"]

我的错误到底是什么，我该如何解决？似乎是一个简单的修复，我就是想不通。

谢谢。

更新:

行内:

let components = calendar.components(componentOptions, fromDate: NSDate())

我将 fromDate 更改为 from 并且在一系列 Xcode 推荐的更改之后我得到了:

let components = calendar.dateComponents(componentOptions, from: NSDate() as Date)

但我现在收到错误:

Cannot convert value of type 'NSCalendar.Unit' to expected argument type 'Set<Calendar.Component>'

Answer 1

试试这些行:

let calendar = Calendar.current
let components = calendar.dateComponents([.weekday], from: Date())