[英]How do I get the day of the week with Foundation?
如何将星期几作为字符串?
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. 输出当前星期几作为区域设置中的字符串,具体取决于当前的区域设置。
To get just a week day number you must use NSCalendar class: 要获得一个星期的数字,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];
Just use these three lines: 只需使用以下三行:
CFAbsoluteTime at = CFAbsoluteTimeGetCurrent();
CFTimeZoneRef tz = CFTimeZoneCopySystem();
SInt32 WeekdayNumber = CFAbsoluteTimeGetDayOfWeek(at, tz);
Many of the answers here are deprecated. 这里的许多答案都已弃用。 This works as of iOS 8.4 and gives you the day of the week as a string and as a number. 这适用于iOS 8.4,并以字符串和数字的形式为您提供星期几。
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);
Here's how you do it in Swift 3, and get a localised day name… 以下是您在Swift 3中的操作方法,并获得本地化的日期名称......
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);
}
I needed a simple (Gregorian) day of the week index, where 0=Sunday and 6=Saturday to be used in pattern match algorithms. 我需要一个简单的(格里高利)星期日索引,其中0 =星期日,6 =星期六用于模式匹配算法。 From there it is a simple matter of looking up the day name from an array using the index. 从那里,使用索引从数组中查找日期名称是一件简单的事情。 Here is what I came up with that doesn't require date formatters, or NSCalendar or date component manipulation: 以下是我提出的不需要日期格式化程序,或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;
}
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: 您可以致电的任何地方
let today = NSDate.getBeautyToday()
print(today) ---> "Monday, 14 December"
Swift 3.0 Swift 3.0
As @delta2flat suggested, I update answer giving user the ability to specify custom format. 正如@ delta2flat建议的那样,我更新答案,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)
}
}
Here is the updated code for Swift 3 这是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: 要将事件的名称打印为String:
let dateFromat = DateFormatter()
datFormat.dateFormat = "EEEE"
let name = datFormat.string(from: Date())
Vladimir's answer worked well for me, but I thought that I would post the Unicode link for the date format strings. 弗拉基米尔的答案对我很有用,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 http://www.unicode.org/reports/tr35/tr35-25.html#Date_Format_Patterns
This link is for iOS 6. The other versions of iOS have different standards which can be found in the X-Code documentation. 此链接适用于iOS 6.其他版本的iOS具有不同的标准,可在X-Code文档中找到。
This way it works in Swift: 这种方式适用于Swift:
let calendar = NSCalendar.currentCalendar()
let weekday = calendar.component(.CalendarUnitWeekday, fromDate: NSDate())
Then assign the weekdays to the resulting numbers. 然后将工作日分配给结果数字。
I had quite strange issue with getting a day of week. 得到一周的一天我有一个非常奇怪的问题。 Only setting firstWeekday wasn't enough. 只设置firstWeekday是不够的。 It was also necesarry to set the time zone. 设置时区也是必要的。 My working solution was: 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: Get day of week in one line. 斯威夫特2:在一行中获得星期几。 ( based on neoscribe answer ) ( 基于neoscribe答案 )
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";
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星期几:
The following two documents may help you. 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 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:
声明:本站的技术帖子网页,遵循CC BY-SA 4.0协议,如果您需要转载,请注明本站网址或者原文地址。任何问题请咨询:yoyou2525@163.com.