我如何计算两个日期之间的天数？

Question

希望有人能帮助我。我需要计算日期之间的天数。流程是：

• 选择日期
• 按年计算的新日期（例如2年）
• 获取＆＃34;选择日期＆＃34;之间的日子。和＃34;新约会＆＃34;

Answer 1

试用此代码，针对Swift 2.0进行了更新

let dateFormatter = NSDateFormatter()
dateFormatter.dateFormat = "yyyy-MM-dd"

let first = "2010-09-01"
let firstDate = dateFormatter.dateFromString(first)!
let last = "2010-09-05"
let lastDate = dateFormatter.dateFromString(last)!

let currentCalendar = NSCalendar.currentCalendar()
let timeUnitDay = NSCalendarUnit.Day

let daysBetween = currentCalendar.components(timeUnitDay, fromDate: firstDate, toDate: lastDate, options: NSCalendarOptions.MatchStrictly)

print(daysBetween.day)