在 Swift 中设置当前年份的变量

Question

如何在 Swift 中将变量year设置为当前年份？

let year = ...

Answer 1

使用Calendar和Date ：

let year = Calendar.current.component(.year, from: Date())

Answer 2

let date = Date()
let calendar = Calendar.current

let year = calendar.component(.year, from: date)
let month = calendar.component(.month, from: date)
let day = calendar.component(.day, from: date)

Answer 3

斯威夫特 5 更新：

let year = Calendar.current.dateComponents([.year], from: Date()).year