我如何获得可可触觉的一天?

How do I get the day of the week as a string in Objective-C?

我如何在Objective-C中把一周的一天作为一个字符串?

13 个解决方案

#1

214

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

outputs current day of week as a string in locale dependent on current regional settings.

根据当前区域设置，以字符串的形式输出当前星期。

To get just a week day number you must use NSCalendar class:

要得到一个星期的数字，你必须使用NSCalendar类:

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

#2

Just use these three lines:

只用这三行:

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

#3

Many of the answers here are deprecated. This works as of iOS 8.4 and gives you the day of the week as a string and as a number.

这里的许多答案都是不赞成的。这是ios8.4的工作，它会给你一周的时间作为一个字符串和一个数字。

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);

#4

-(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); 
}

#5

Here's how you do it in Swift 3, and get a localised day name…

这是你如何在Swift 3中做到的，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]

#6

I needed a simple (Gregorian) day of the week index, where 0=Sunday and 6=Saturday to be used in pattern match algorithms. From there it is a simple matter of looking up the day name from an array using the index. Here is what I came up with that doesn't require date formatters, or NSCalendar or date component manipulation:

我需要一个简单的(Gregorian)的星期指数，其中0=Sunday和6=周六在模式匹配算法中使用。从这里开始，只需使用索引从数组中查找日名。下面是我提出的不需要日期格式器、NSCalendar或日期组件操作的方法:

+(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;
}

#7

Here is the updated code for Swift 3

以下是Swift 3的更新代码。

Code :

代码:

let calendar = Calendar(identifier: .gregorian)

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

To Print the name of the event as String:

将事件名称打印为字符串:

 let dateFromat = DateFormatter()

datFormat.dateFormat = "EEEE"

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

#8

I think this topic is really useful, so I post some code Swift 2.1 compatible.

我认为这个主题非常有用，所以我发布了一些与Swift 2.1兼容的代码。

extension NSDate {

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

}

Anywhere you can call:

任何你可以调用:

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

Swift 3.0

斯威夫特3.0

As @delta2flat suggested, I update answer giving user the ability to specify custom format.

正如@delta2flat所建议的，我更新了答案，使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)
    }

}

#9

Vladimir's answer worked well for me, but I thought that I would post the Unicode link for the date format strings.

Vladimir的回答对我来说效果很好，但我想我会把日期格式字符串的Unicode链接发上去。

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

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

This link is for iOS 6. The other versions of iOS have different standards which can be found in the X-Code documentation.

这个链接是iOS 6的。iOS的其他版本有不同的标准，可以在X-Code文档中找到。

#10

This way it works in Swift:

这样它在Swift中工作:

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

Then assign the weekdays to the resulting numbers.

然后把工作日分配给结果的数字。

#11

I had quite strange issue with getting a day of week. Only setting firstWeekday wasn't enough. It was also necesarry to set the time zone. My working solution was:

我有一个很奇怪的问题，就是一周有一天。仅仅设定第一个工作日是不够的。设定时区也是必要的。我的工作的解决方案是:

 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]  ;

#12

Swift 2: Get day of week in one line. (based on neoscribe answer)

Swift 2:在一条线上获得一周中的一天。(基于neoscribe回答)

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

#13

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";

there are three symbols we can use to format day of week:

我们可以使用三个符号来格式化一周的一天:

The following two documents may help you.

以下两个文档可能对您有所帮助。

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

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

Demo:

演示:

you can test your pattern on this website:

你可以在这个网站上测试你的模式:

http://nsdateformatter.com/

#1

214

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