在 Swift 中使用 NSDateComponents 从出生日期计算年龄

Question

我正在尝试使用这个函数从 Swift 中的生日日期计算年龄：

var calendar : NSCalendar = NSCalendar.currentCalendar()

var dateComponentNow : NSDateComponents = calendar.components(
             NSCalendarUnit.CalendarUnitYear, 
             fromDate: birthday, 
             toDate: age, 
             options: 0)

但我收到一个错误Extra argument toDate in call

在目标 c 中这是代码，但我不知道为什么会出现此错误：

NSDate* birthday = ...;

NSDate* now = [NSDate date];
NSDateComponents* ageComponents = [[NSCalendar currentCalendar] 
                               components:NSYearCalendarUnit 
                               fromDate:birthday
                               toDate:now
                               options:0];
NSInteger age = [ageComponents year]; 

还有比这更好的正确形式吗？

Answer 1

您收到一条错误消息，因为0 不是NSCalendarOptions 的有效值。 对于“无选项”，请使用NSCalendarOptions(0) 或直接使用nil：

let ageComponents = calendar.components(.CalendarUnitYear,
                              fromDate: birthday,
                                toDate: now,
                               options: nil)
let age = ageComponents.year

(指定nil 是可能的，因为NSCalendarOptions 符合RawOptionSetType 协议，该协议又继承 来自NilLiteralConvertible。）

Swift 2 更新：

let ageComponents = calendar.components(.Year,
    fromDate: birthday,
    toDate: now,
    options: [])

Swift 3 更新：

假设使用了 Swift 3 类型 Date 和 Calendar：

let now = Date()
let birthday: Date = ...
let calendar = Calendar.current

let ageComponents = calendar.dateComponents([.year], from: birthday, to: now)
let age = ageComponents.year!

Answer 2

我创建这个方法非常简单，只需将生日日期放入方法中，这将返回年龄作为 Int

斯威夫特 3

func calcAge(birthday: String) -> Int {
    let dateFormater = DateFormatter()
    dateFormater.dateFormat = "MM/dd/yyyy"
    let birthdayDate = dateFormater.date(from: birthday)
    let calendar: NSCalendar! = NSCalendar(calendarIdentifier: .gregorian)
    let now = Date()
    let calcAge = calendar.components(.year, from: birthdayDate!, to: now, options: [])
    let age = calcAge.year
    return age!
}

斯威夫特 2

func calcAge(birthday: String) -> Int{
    let dateFormater = NSDateFormatter()
    dateFormater.dateFormat = "MM/dd/yyyy"
    let birthdayDate = dateFormater.dateFromString(birthday)
    let calendar: NSCalendar! = NSCalendar(calendarIdentifier: NSCalendarIdentifierGregorian)
    let now: NSDate! = NSDate()
    let calcAge = calendar.components(.Year, fromDate: birthdayDate!, toDate: now, options: [])
    let age = calcAge.year
    return age
}

用法

print(calcAge("06/29/1988"))

Answer 3

对于 swift 4 工作正常

func getAgeFromDOF(date: String) -> (Int,Int,Int) {

    let dateFormater = DateFormatter()
    dateFormater.dateFormat = "YYYY-MM-dd"
    let dateOfBirth = dateFormater.date(from: date)

    let calender = Calendar.current

    let dateComponent = calender.dateComponents([.year, .month, .day], from: 
    dateOfBirth!, to: Date())

    return (dateComponent.year!, dateComponent.month!, dateComponent.day!)
}

let age  = getAgeFromDOF(date: "2000-12-01")

print("\(age.0) Year, \(age.1) Month, \(age.2) Day")

Answer 4

这适用于 Swift 3

let myDOB = Calendar.current.date(from: DateComponents(year: 1994, month: 9, day: 10))!
let myAge = Calendar.current.dateComponents([.month], from: myDOB, to: Date()).month!
let years = myAge / 12
let months = myAge % 12
print("Age : \(years).\(months)")

Answer 5

这对我来说适用于 swift 3..

let now = NSDate()
    let calendar : NSCalendar = NSCalendar.current as NSCalendar
    let ageComponents = calendar.components(.year, from: datePickerView.date, to: now as Date, options: [])
    let age = ageComponents.year!
    ageCalculated.text = String(age)

感谢@Martin R

Answer 6

这是 swift 5 上最好的方法

lazy var dateFormatter : DateFormatter = {
        let formatter = DateFormatter()
        formatter.dateFormat = "yyyy-MM-dd"
        formatter.locale = Locale(identifier: "en_US_POSIX")
        return formatter
    }()

let birthday = dateFormatter.date(from: "1980-04-25")
let timeInterval = birthday?.timeIntervalSinceNow
let age = abs(Int(timeInterval! / 31556926.0))

Answer 7

//创建字符串扩展名更容易

extension String {
            func getDate(format: String) -> Date {
                let dateFormatter = DateFormatter()
                dateFormatter.dateFormat = format
                dateFormatter.locale = Locale(identifier: "en_US_POSIX")
                return dateFormatter.date(from: self) ?? Date()
            } 
        }

1. 获取今天的日期和您的生日日期

let today = Date()

let birthDate = "1990-01-01".getDate(format: "yyyy-MM-dd")

1. 创建用户当前日历的实例

let calendar = Calendar.current

1. 使用日历获取两个日期之间的差异

let components = calendar.dateComponents([.year, .month, .day], from: birthDate, to: today)

let ageYears = components.year //得到多少岁

let ageMonths = components.month //额外的几个月

let ageDays = components.day // 额外天数