我如何得到基金会的一天?

NSDateFormatter *dateFormatter = [[[NSDateFormatter alloc] init] autorelease];  
[dateFormatter setDateFormat:@"EEEE"];
NSLog(@"%@", [dateFormatter stringFromDate:[NSDate date]]);

根据当前区域设置,在区域设置中将当前星期几输出为字符串。

要获得一周的日数,您必须使用nscalendar类:

NSCalendar *gregorian = [[[NSCalendar alloc] initWithCalendarIdentifier:NSGregorianCalendar] autorelease];
NSDateComponents *comps = [gregorian components:NSWeekdayCalendarUnit fromDate:[NSDate date]];
int weekday = [comps weekday];

只需使用这三行:

CFAbsoluteTime at = CFAbsoluteTimeGetCurrent();
CFTimeZoneRef tz = CFTimeZoneCopySystem();
SInt32 WeekdayNumber = CFAbsoluteTimeGetDayOfWeek(at, tz);

这里的许多答案都被否决了。从iOS 8.4开始,它将一周中的某一天作为一个字符串和数字。

NSDateFormatter *dateFormatter = [[NSDateFormatter alloc] init];
[dateFormatter setDateFormat:@"EEEE"];
NSLog(@"The day of the week: %@", [dateFormatter stringFromDate:[NSDate date]]);

NSCalendar *gregorian = [[NSCalendar alloc] initWithCalendarIdentifier:NSCalendarIdentifierGregorian];
NSDateComponents *comps = [gregorian components:NSCalendarUnitWeekday fromDate:[NSDate date]];
int weekday = [comps weekday];
NSLog(@"The week day number: %d", weekday);

以下是您在Swift 3中的操作方法,并获得一个本地化的日名_

let dayNumber = Calendar.current.component(.weekday, from: Date()) // 1 - 7
let dayName = DateFormatter().weekdaySymbols[dayNumber - 1]

-(void)getdate {
    NSDateFormatter *dateFormat = [[NSDateFormatter alloc] init];
    [dateFormat setDateFormat:@"yyyy-MM-dd"];
    NSDateFormatter *format = [[NSDateFormatter alloc] init];
    [format setDateFormat:@"MMM dd, yyyy HH:mm"];
    NSDateFormatter *timeFormat = [[NSDateFormatter alloc] init];
    [timeFormat setDateFormat:@"HH:mm:ss"];
    NSDateFormatter *dateFormatter = [[NSDateFormatter alloc] init] ;
    [dateFormatter setDateFormat:@"EEEE"];

    NSDate *now = [[NSDate alloc] init];
    NSString *dateString = [format stringFromDate:now];
    NSString *theDate = [dateFormat stringFromDate:now];
    NSString *theTime = [timeFormat stringFromDate:now];

    NSString *week = [dateFormatter stringFromDate:now];
    NSLog(@"\n"
          "theDate: |%@| \n"
          "theTime: |%@| \n"
          "Now: |%@| \n"
          "Week: |%@| \n"
         , theDate, theTime,dateString,week); 
}

我需要一个简单的(公历)星期一索引,其中0=Sunday和6=Saturday用于模式匹配算法。从这里可以简单地从使用索引的数组中查找日名称。以下是我提出的不需要日期格式化程序、nscalendar或日期组件操作的内容:

+(long)dayOfWeek:(NSDate *)anyDate {
    //calculate number of days since reference date jan 1, 01
    NSTimeInterval utcoffset = [[NSTimeZone localTimeZone] secondsFromGMT];
    NSTimeInterval interval = ([anyDate timeIntervalSinceReferenceDate]+utcoffset)/(60.0*60.0*24.0);
    //mod 7 the number of days to identify day index
    long dayix=((long)interval+8) % 7;
    return dayix;
}

这是SWIFT 3的更新代码

代码:

let calendar = Calendar(identifier: .gregorian)

let weekdayAsInteger = calendar.component(.weekday, from: Date())

要将事件名称打印为字符串:

 let dateFromat = DateFormatter()

datFormat.dateFormat = "EEEE"

let name = datFormat.string(from: Date())

我认为这个主题非常有用,所以我发布了一些代码 银行代码:2.1 兼容的。

extension NSDate {

    static func getBeautyToday() -> String {
       let now = NSDate()
       let dateFormatter = NSDateFormatter()
       dateFormatter.dateFormat = "EEEE',' dd MMMM"
       return dateFormatter.stringFromDate(now)
    }

}

任何你可以打电话的地方:

let today = NSDate.getBeautyToday()
print(today) ---> "Monday, 14 December"

银行代码:3.0

正如@delta2flat建议的那样,我更新了答案,让用户能够指定自定义格式。

extension NSDate {

    static func getBeautyToday(format: String = "EEEE',' dd MMMM") -> String {
        let now = Date()
        let dateFormatter = DateFormatter()
        dateFormatter.dateFormat = format
        return dateFormatter.string(from: now)
    }

}

弗拉基米尔的回答对我来说很有效,但我想我会发布日期格式字符串的Unicode链接。

http://www.unicode.org/reports/tr35/tr35-25.html#Date_Format_Patterns

此链接适用于iOS 6。其他版本的iOS有不同的标准,可以在X代码文档中找到。

这样它就可以在swift中工作:

    let calendar = NSCalendar.currentCalendar()
    let weekday = calendar.component(.CalendarUnitWeekday, fromDate: NSDate())

然后将工作日分配给生成的数字。

我有一个很奇怪的问题,一周中有一天。仅仅设置第一个工作日是不够的。设定时区也很有必要。我的工作解决方案是:

 NSCalendar* cal = [NSCalendar currentCalendar];
 [cal setTimeZone:[NSTimeZone timeZoneForSecondsFromGMT:0]];
 [cal setFirstWeekday:1]; //Sunday
 NSDateComponents* comp = [cal components:( NSWeekOfMonthCalendarUnit | NSYearCalendarUnit | NSMonthCalendarUnit | NSDayCalendarUnit | NSWeekdayCalendarUnit | NSWeekCalendarUnit)  fromDate:date];
 return [comp weekday]  ;

Swift 2:在一行中获取一周中的某一天。( based on neoscribe answer )

let dayOfWeek  = Int((myDate.timeIntervalSinceReferenceDate / (60.0*60.0*24.0)) % 7)
let isMonday   = (dayOfWeek == 0)
let isSunday   = (dayOfWeek == 6)

self.dateTimeFormatter = [[NSDateFormatter alloc] init];
self.dateTimeFormatter.timeZone = [NSTimeZone timeZoneForSecondsFromGMT:0]; // your timezone
self.dateTimeFormatter.locale = [NSLocale localeWithLocaleIdentifier:@"zh_CN"]; // your locale
self.dateTimeFormatter.dateFormat = @"ccc MM-dd mm:ss";

我们可以使用三个符号来设置星期几的格式:

• e
• e
• C

以下两个文件可能对您有所帮助。

https://developer.apple.com/library/content/documentation/Cocoa/Conceptual/DataFormatting/Articles/dfDateFormatting10_4.html

http://www.unicode.org/reports/tr35/tr35-31/tr35-dates.html#Date_Format_Patterns

演示:

您可以在此网站上测试您的模式:

http://nsdateformatter.com/