NSDateFormatter有一个简单的方法来获得"今天","明天","星期五"的日期吗？

import Foundation

func getFormattedDate(_ date: Date) -> String {
    let dateFormatter = DateFormatter()
    dateFormatter.dateFormat = "yyyy年MM月dd日"
    return dateFormatter.string(from: date)
}

func getToday() -> String {
    let today = Date()
    return getFormattedDate(today)
}

func getTomorrow() -> String {
    let tomorrow = Calendar.current.date(byAdding: .day, value: 1, to: Date())!
    return getFormattedDate(tomorrow)
}

func getFriday() -> String {
    let friday = Calendar.current.date(byAdding: .day, value: 5, to: Date())!
    return getFormattedDate(friday)
}

print("今天是：\(getToday())")
print("明天是：\(getTomorrow())")
print("星期五是：\(getFriday())")