如何以整数格式获取NSDate日,月和年？

Question

我想得到NSDate整数形式的日,月和年组件,即如果日期是1/2/1988那么我应该分别得到1,2和1988作为整数.我怎么能在iOS中这样做？我发现了类似的问题,但方法是descriptionWithCalendarFormat:给出警告,现在似乎已被弃用了.

Answer 1

这个给你,

NSDate *currentDate = [NSDate date];
NSCalendar* calendar = [NSCalendar currentCalendar];
NSDateComponents* components = [calendar components:NSCalendarUnitYear|NSCalendarUnitMonth|NSCalendarUnitDay fromDate:currentDate]; // Get necessary date components

 [components month]; //gives you month
 [components day]; //gives you day
 [components year]; // gives you year

您可以像上面那样使用NSDateComponents.

请访问此页面了解详情.

希望能帮助到你.

Answer 2

是的,通过使用NSCalendar,我认为这将使你的工作.

NSDateComponents *components = [[NSCalendar currentCalendar] components:NSDayCalendarUnit | NSMonthCalendarUnit | NSYearCalendarUnit fromDate:[NSDate date]];
NSInteger day = [components day];    
NSInteger month = [components month];
NSInteger year = [components year];

Answer 3

迅速

let components = NSCalendar.currentCalendar().components([.Day, .Month, .Year], fromDate: self)
let day = components.day
let month = components.month
let year = components.year

为方便起见,您可以将其放在NSDate扩展名中并使其返回元组:

extension NSDate: Comparable {

    var dayMonthYear: (Int, Int, Int) {
        let components = NSCalendar.currentCalendar().components([.Day, .Month, .Year], fromDate: self)
        return (components.day, components.month, components.year)
    }
}

现在你只需要写:

let (day, month, year) = date.dayMonthYear

如果你想例如只获得你可以写的年份:

let (_, _, year) = date.dayMonthYear

Answer 4

您可以使用NSDateComponents来实现此目的,

NSCalendar *calendar = [NSCalendar autoupdatingCurrentCalendar];
NSDate *currDate = [NSDate date];
NSDateComponents *dComp = [calendar components:( NSYearCalendarUnit | NSMonthCalendarUnit |  NSDayCalendarUnit ) 
                                      fromDate:currDate];

int day = [dComp day];
int month = [dComp month];
int year = [dComp year];

Answer 5

对于那些只是直接从网上复制和粘贴的人,就像我一样,这是iOS 8的一个小更新

NSCalendar* calendar = [NSCalendar currentCalendar];
NSDateComponents* components = [calendar components:NSCalendarUnitYear|NSCalendarUnitMonth|NSCalendarUnitDay fromDate:[NSDate date]];
[components day]; //Day
[components month];//Month
[components year];//Year

差异NSCalendarUnitYear|NSCalendarUnitMonth|NSCalendarUnitDay NSMonthCalendarUnit | NSDayCalendarUnit | NSYearCalendarUnit | NSWeekdayCalendarUnit已被弃用

Answer 6

把它放在一个扩展中,过你的生活

extension Date{
    var day:Int {return Calendar.current.component(.day, from:self)}
    var month:Int {return Calendar.current.component(.month, from:self)}
    var year:Int {return Calendar.current.component(.year, from:self)}
}
Date().day//22
Date().month//4
Date().year//2017

Swift 3.0(它是以前答案的迭代,但是为所有未来的应用程序项目解决了它)