[英]How do I get weekday and/or name of month from a NSDate variable?
好的。 我们遇到的问题是我们有 NSStrings 以 yyyyMMdd 格式填充日期,我们想要做的是获取当前工作日和月份名称。 函数 dagOmvandlare 将日期字符串转换为工作日和月份。 然后在 viewDidload 上调用该函数来命名我们所有的按钮标题,从英语到瑞典语月份。
我们目前的解决方案是这样的:
-(NSString *)dagOmvandlare:(id) suprDatum{
NSDateFormatter *dateFormatter = [[[NSDateFormatter alloc] init] autorelease];
dateFormatter.dateFormat = @"yyyyMMdd";
NSDate *date = [dateFormatter dateFromString:suprDatum];
NSString * monthString = [date descriptionWithCalendarFormat:@"%B"timeZone:nil
locale:[[NSUserDefaults standardUserDefaults] dictionaryRepresentation]];
if ([monthString isEqualToString:@"January"]) {
monthString = @"Januari";
}
else
if ([monthString isEqualToString:@"February"]) {
monthString = @"Februari";
}
else
if ([monthString isEqualToString:@"May"]) {
monthString = @"Maj";
}
else
if ([monthString isEqualToString:@"June"]) {
monthString = @"Juni";
}
else
if ([monthString isEqualToString:@"July"]) {
monthString = @"Juli";
}
else
if ([monthString isEqualToString:@"August"]) {
monthString = @"Augusti";
}
else
if ([monthString isEqualToString:@"October"]) {
monthString = @"Oktober";
}
else
if ([monthString isEqualToString:@"March"]) {
monthString = @"Mars";
}
return monthString;
}
- (void)viewDidLoad {
[super viewDidLoad];
[button3 setTitle:(NSString *)[self dagOmvandlare:self.datum1] forState:UIControlStateNormal];
[button2 setTitle:(NSString *)[self dagOmvandlare:self.datum2] forState:UIControlStateNormal];
[bmanad1 setTitle:(NSString *)[self dagOmvandlare:self.datum3] forState:UIControlStateNormal];
}
到目前为止我们已经弄清楚的是
NSString * monthString = [date descriptionWithCalendarFormat:@"%B"timeZone:nil
locale:[[NSUserDefaults standardUserDefaults] dictionaryRepresentation]];
Apple 的非公开 api 指南不允许使用它。 所以主要问题是,还有什么其他方法可以从包含格式为 yyyyMMdd 的日期的日期字符串中获取工作日和月份名称?
无需手动转换为瑞典语单词。 iPhone 会为你做这件事。 试试这个:
NSDateFormatter *dateFormatter = [[NSDateFormatter alloc] init];
dateFormatter.dateFormat = @"yyyyMMdd";
NSDate *date = [dateFormatter dateFromString:@"20111010"];
// set swedish locale
dateFormatter.locale=[[NSLocale alloc] initWithLocaleIdentifier:@"sv_SE"];
dateFormatter.dateFormat=@"MMMM";
NSString *monthString = [[dateFormatter stringFromDate:date] capitalizedString];
NSLog(@"month: %@", monthString);
dateFormatter.dateFormat=@"EEEE";
NSString *dayString = [[dateFormatter stringFromDate:date] capitalizedString];
NSLog(@"day: %@", dayString);
输出:
month: Oktober
day: Måndag
简单的 Swift 3 扩展:
// Weekday
extension Date {
func dayOfWeek() -> String? {
let dateFormatter = DateFormatter()
dateFormatter.dateFormat = "EEEE"
return dateFormatter.string(from: self).capitalized
// or capitalized(with: locale)
}
}
print(Date().dayOfWeek()!) // Wednesday
// Month Name
extension Date {
func monthName() -> String? {
let dateFormatter = DateFormatter()
dateFormatter.dateFormat = "MMMM"
return dateFormatter.string(from: self).capitalized
// or capitalized(with: locale)
}
}
print(Date().monthName()!) // October
NSString *strDate=@"20110407";
NSDateFormatter *df=[[[NSDateFormatter alloc] init] autorelease];
[df setDateFormat:@"yyyyMMdd"];
NSDate *targetDate=[df dateFromString:strDate];
[df setDateFormat:@"EEEE MMMM dd, yyyy"];
NSString *s=[df stringFromDate:targetDate];
NSLog(@"Date: %@", s);
希望这可以帮助
NSCalendar *calendar= [[NSCalendar alloc] initWithCalendarIdentifier:NSGregorianCalendar];
NSCalendarUnit unitFlags = NSYearCalendarUnit | NSMonthCalendarUnit | NSDayCalendarUnit | NSHourCalendarUnit | NSMinuteCalendarUnit | NSSecondCalendarUnit;
NSDate *date = [NSDate date];
NSDateComponents *dateComponents = [calendar components:unitFlags fromDate:date];
NSInteger year = [dateComponents year];
NSInteger month = [dateComponents month];
NSInteger day = [dateComponents day];
NSInteger hour = [dateComponents hour];
NSInteger minute = [dateComponents minute];
NSInteger second = [dateComponents second];
[calendar release];
这可能有用
另一个可能对您有帮助的问题How to find weekday from today's date using NSDate?
NSDateFormatter *dateFormatter = [[NSDateFormatter alloc] init];
[dateFormatter setDateFormat:@"EEEE"];
NSString *dayName = [dateFormatter stringFromDate:Date];
这个 dayName 将在用户的语言环境中可用。
正如苹果所说,创建(并让 ARC 处理)格式化程序非常昂贵,因此:
1)在你的文件中声明:
private var localDateFormatter : DateFormatter?
..
extension Date {
2)使用惰性方法:
if localDateFormatter == nil{
localDateFormatter = DateFormatter()
let locale = Locale(identifier: "en_US_POSIX")
....}
let newTime = localDateFormatter!.date(from: self)
如果你在一个类中拥有所有东西,那么静态/让成员会很好。 (我们不能在扩展中使用 vars...:( globals 看起来很糟糕但没办法...)
您可以使用(对于 Swift 和 Türkiye 本地化):
dateFormatter.locale = NSLocale(localeIdentifier: "tr_TR") as Locale
- (void) getMonthFromDate:(NSString *) stringDate
{
NSDateFormatter *dateFormat = [[NSDateFormatter alloc] init];
[dateFormat setDateFormat:@"yyyy-MM-dd"];
NSDate *date = [dateFormat dateFromString:stringDate];
NSCalendar* calendar = [NSCalendar currentCalendar];
NSDateComponents* components = [calendar components:NSCalendarUnitYear|NSCalendarUnitMonth|NSCalendarUnitDay fromDate:date]; // Get necessary date components
NSLog(@"%lu", [components day]);
NSLog(@"%lu %@",[components day],[[dateFormat monthSymbols] objectAtIndex:[components month]]);
}
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