计算出生日期的年龄 [英] Calculate age from birth date

问题描述

我从出生日期就无法找到年龄。我得到的是

I cant find age in from birth date. What I got is

fatal error: unexpectedly found nil while unwrapping an Optional value
(lldb) 

我的代码

override func viewDidLoad() {
        super.viewDidLoad()
var dateString = user.birthday
        var dateFormatter = NSDateFormatter()
        // this is imporant - we set our input date format to match our input string
        dateFormatter.dateFormat = "dd-MM-yyyy"
        // voila!
        var dateFromString = dateFormatter.dateFromString(dateString)

        let age = calculateAge(dateFromString!)
}

func calculateAge (birthday: NSDate) -> NSInteger {

        var userAge : NSInteger = 0
        var calendar : NSCalendar = NSCalendar.currentCalendar()
        var unitFlags : NSCalendarUnit = NSCalendarUnit.CalendarUnitYear | NSCalendarUnit.CalendarUnitMonth | NSCalendarUnit.CalendarUnitDay
        var dateComponentNow : NSDateComponents = calendar.components(unitFlags, fromDate: NSDate())
        var dateComponentBirth : NSDateComponents = calendar.components(unitFlags, fromDate: birthday)

        if ( (dateComponentNow.month < dateComponentBirth.month) ||
            ((dateComponentNow.month == dateComponentBirth.month) && (dateComponentNow.day < dateComponentBirth.day))
            )
        {
            return dateComponentNow.year - dateComponentBirth.year - 1
        }
        else {
            return dateComponentNow.year - dateComponentBirth.year
        }
    }

推荐答案

更新： Xcode 8.2.1 •Swift 3.0.2

extension Date {
    var age: Int {
        return Calendar.current.dateComponents([.year], from: self, to: Date()).year!
    }
}

let myDOB = Calendar.current.date(from: DateComponents(year: 1970, month: 9, day: 10))!

let myAge = myDOB.age      // 46

Xcode 7.2•Swift 2.1.1

您可以使用NSCalendar方法组件计算从特定日期到今天的年数，如下所示：

You can use the NSCalendar method components to calculate how many years from a specific date to today as follow:

extension NSDate {
    var age: Int {
        return NSCalendar.currentCalendar().components(.Year, fromDate: self, toDate: NSDate(), options: []).year
    }
}

let myDOB = NSCalendar.currentCalendar().dateWithEra(1, year: 1970, month: 09, day: 10, hour: 0, minute: 0, second: 0, nanosecond: 0)!
let myAge = myDOB.age      // 46

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