Swift 3

Question

我正在使用Objective C for iPhone并拥有一个我希望以完整风格但没有年份的NSDate。现在我正在使用下面的代码，但它也显示了年份，我不希望这样。由于我想以正确的地区格式显示日期，我不能只删除最后一年，因为在某些国家，年份不会在最后，而是在中间或开始。

NSDate *testdate = [NSDate date];
NSDateFormatter *dateFormattertest = [[NSDateFormatter alloc] init];
[dateFormattertest setDateStyle:NSDateFormatterFullStyle];
[dateFormattertest setTimeStyle:NSDateFormatterNoStyle];
NSString *formattedDateString = [dateFormattertest stringFromDate:testdate];
NSLog(formattedDateString);

In US this give me:
Thursday, January 14, 2010

In Sweden this give me:
torsdag, 2010 januari 14

这是什么解决方案？另一个问题，我在哪里可以找到有关如何使用NSDateFormatter的setDateFormat的信息？我无法找到有关API中不同字母的信息。

Answer 1

我知道这是一个非常古老的问题，但这是我在SO上发现的唯一一个谈到我遇到的同样问题的问题。

此处使用的关键方法是： dateFormatFromTemplate

您希望将格式设置为：

，而不是设置样式

NSDate *testdate = [NSDate date];

NSLocale *currentLocale = [NSLocale currentLocale];

// Set the date components you want
NSString *dateComponents = @"EEEEMMMMd";

// The components will be reordered according to the locale
NSString *dateFormat = [NSDateFormatter dateFormatFromTemplate:dateComponents options:0 locale:currentLocale];
NSLog(@"Date format for %@: %@", [currentLocale displayNameForKey:NSLocaleIdentifier value:[currentLocale localeIdentifier]], dateFormat);

NSDateFormatter *dateFormatter =[[NSDateFormatter alloc] init];
[dateFormatter setDateFormat:dateFormat];

NSString *formattedDateString = [dateFormatter stringFromDate:testdate];
NSLog(formattedDateString);

特别感谢：http://oleb.net/blog/2011/11/working-with-date-and-time-in-cocoa-part-2/

Answer 2

Swift 3

    let template = "EEEEdMMM"

    let format = DateFormatter.dateFormat(fromTemplate: template, options: 0, locale: NSLocale.current)
    let formatter = DateFormatter()
    formatter.dateFormat = format

    let now = Date()
    let whatYouWant = formatter.string(from: now) // ex: Sunday, Mar 5

与template一起玩，以满足您的需求。

文档和示例here可帮助您确定所需的模式。

Answer 3

给了@Joss对Swift扩展的很好的答案：

extension NSDate {
    func formattedFromCompenents(styleAttitude: NSDateFormatterStyle, year: Bool = true, month: Bool = true, day: Bool = true, hour: Bool = true, minute: Bool = true, second: Bool = true) -> String {
        let long = styleAttitude == .LongStyle || styleAttitude == .FullStyle
        var comps = ""

        if year { comps += long ? "yyyy" : "yy" }
        if month { comps += long ? "MMMM" : "MMM" }
        if day { comps += long ? "dd" : "d" }

        if hour { comps += long ? "HH" : "H" }
        if minute { comps += long ? "mm" : "m" }
        if second { comps += long ? "ss" : "s" }

        let format = NSDateFormatter.dateFormatFromTemplate(comps, options: 0, locale: NSLocale.currentLocale())
        let formatter = NSDateFormatter()
        formatter.dateFormat = format
        return formatter.string(from: self)
    }
}

Answer 4

Swift 4

extension Date {
    public func formattedFromComponents(styleAttitude: DateFormatter.Style, year: Bool = false, month: Bool = false, day: Bool = false, hour: Bool = false, minute: Bool = false, second: Bool = false, locale: Locale = Locale.current) -> String {
        let long = styleAttitude == .long || styleAttitude == .full
        let short = styleAttitude == .short
        var comps = ""

        if year { comps += long ? "yyyy" : "yy" }
        if month { comps += long ? "MMMM" : (short ? "MM" : "MMM") }
        if day { comps += long ? "dd" : "d" }

        if hour { comps += long ? "HH" : "H" }
        if minute { comps += long ? "mm" : "m" }
        if second { comps += long ? "ss" : "s" }
        let format = DateFormatter.dateFormat(fromTemplate: comps, options: 0, locale: locale)
        let formatter = DateFormatter()
        formatter.dateFormat = format
        return formatter.string(from: self)
    }
}

Answer 5

这是一个快速选项，只显示标签上的月份日期：

let todaysDate: NSDate = NSDate()
let formatter = NSDateFormatter()
formatter.dateFormat = "MMMM dd"
self.todayLabel.text = formatter.stringFromDate(todaysDate)

NSDate完整风格但没有年份

5 个答案:

Swift 3