swift - 如何从日期类型中获取日期和月份 - swift 4

Question

我有数据类型为日期的变量，我以这种格式存储日期

2018-12-24 18:00:00 UTC

我怎样才能从这一天或这个月得到？

Answer 1

细节

Xcode 版本 11.0 (11A420a)，Swift 5

链接

How to convert string to Date

解决方案

extension Date {
    func get(_ components: Calendar.Component..., calendar: Calendar = Calendar.current) -> DateComponents {
        return calendar.dateComponents(Set(components), from: self)
    }

    func get(_ component: Calendar.Component, calendar: Calendar = Calendar.current) -> Int {
        return calendar.component(component, from: self)
    }
}

用法

let date = Date()

// MARK: Way 1

let components = date.get(.day, .month, .year)
if let day = components.day, let month = components.month, let year = components.year {
    print("day: \(day), month: \(month), year: \(year)")
}

// MARK: Way 2

print("day: \(date.get(.day)), month: \(date.get(.month)), year: \(date.get(.year))")