我想在Swift中设置一个日期风格。我已经在Objective-c中完成了这个，这是Objective-c代码。
NSDateFormatter *dateFormatter = [[NSDateFormatter alloc]init];
[dateFormatter setDateStyle:(NSDateFormatterMediumStyle)];
NSDateFormatter *timeFormatter = [[NSDateFormatter alloc]init];
[timeFormatter setDateFormat:@"h:mm a"];
NSString *fireDate = [dateFormatter stringFromDate:notification.fireDate];
NSString *fireTime = [timeFormatter stringFromDate:notification.fireDate];
NSString *dateTime = [NSString stringWithFormat:@"%@ - %@", fireDate, fireTime];
现在我想要迅速。我已经想到了这个：
var dateFormatter = NSDateFormatter()
var timeFormatter = NSDateFormatter()
timeFormatter.dateFormat = "h:mm a"
//code to set date style.....
var fireDate: NSString = dateFormatter.stringFromDate(notification.fireDate)
var fireTime: NSString = timeFormatter.stringFromDate(notification.fireDate)
var dateTime: NSString = "\(fireDate) - \(fireTime)"
但我无法弄清楚如何在Swift中设置日期样式。随着NSDateFormatterMediumStyle
感谢类型推断，你可以做到这一点
dateFormatter.dateStyle = .medium
dateFormatter.dateStyle = NSDateFormatterStyle.MediumStyle
斯威夫特4：
DateFormatter() has 5 format style options for each of Date and Time. These are:
.none .short .medium .long .full
DATE TIME DATE/TIME STRING
"none" "none"
"none" "short" 9:42 AM
"none" "medium" 9:42:27 AM
"none" "long" 9:42:27 AM EDT
"none" "full" 9:42:27 AM Eastern Daylight Time
"short" "none" 10/10/17
"short" "short" 10/10/17, 9:42 AM
"short" "medium" 10/10/17, 9:42:27 AM
"short" "long" 10/10/17, 9:42:27 AM EDT
"short" "full" 10/10/17, 9:42:27 AM Eastern Daylight Time
"medium" "none" Oct 10, 2017
"medium" "short" Oct 10, 2017, 9:42 AM
"medium" "medium" Oct 10, 2017, 9:42:27 AM
"medium" "long" Oct 10, 2017, 9:42:27 AM EDT
"medium" "full" Oct 10, 2017, 9:42:27 AM Eastern Daylight Time
"long" "none" October 10, 2017
"long" "short" October 10, 2017 at 9:42 AM
"long" "medium" October 10, 2017 at 9:42:27 AM
"long" "long" October 10, 2017 at 9:42:27 AM EDT
"long" "full" October 10, 2017 at 9:42:27 AM Eastern Daylight Time
"full" "none" Tuesday, October 10, 2017
"full" "short" Tuesday, October 10, 2017 at 9:42 AM
"full" "medium" Tuesday, October 10, 2017 at 9:42:27 AM
"full" "long" Tuesday, October 10, 2017 at 9:42:27 AM EDT
"full" "full" Tuesday, October 10, 2017 at 9:42:27 AM Eastern Daylight Time
这是Swift代码：以下代码循环遍历每个代码并显示生成的Date_Time字符串：
import Foundation
let dateTimeFMT = DateFormatter()
var dateTimeString: String = ""
let currentDateTime = Date()
var stylesAsInts: [String] = [ // pre-formatted for display
"\"none\" ", "\"short\" ", "\"medium\"", "\"long\" ", "\"full\" "
]
var dateStyleIdx: Int; var timeStyleIdx: Int
print(" DATE TIME DATE/TIME STRING")
// LOOP through ALL time and date styles (.none .short .medium .long .full)
// these five values equate to 0...4
for dateStyleIdx in 0...4 { // loop on DATE...
dateTimeFMT.dateStyle = DateFormatter.Style(rawValue: UInt(dateStyleIdx))!
for timeStyleIdx in 0...4 { // loop on TIME...
dateTimeFMT.timeStyle = DateFormatter.Style(rawValue: UInt(timeStyleIdx))!
dateTimeString = dateTimeFMT.string(from: currentDateTime)
print("\(stylesAsInts[dateStyleIdx]) \(stylesAsInts[timeStyleIdx]) ", dateTimeString)
}
}
你也可以用它
let formatter = NSDateFormatter()
//format mm-dd-yy like 02-23-15
formatter.dateStyle = .ShortStyle;
//format yyyy-MM-dd like 2015-02-23
formatter.dateFormat = "yyyy-MM-dd";
//format feb 02, 2015
formatter.dateStyle = .MediumStyle;
在swift 3中，sintaxis已经改变了一点，没有NS前缀和小写枚举：
let myDate = Date()
let dateFormatter = DateFormatter()
//affects only the date representation of your date object
// xcode will let you know all the other available options
dateFormatter.dateStyle = .short
//the time part has it's own property (.short, .long, .none)
dateFormatter.timeStyle = .none
//01-27-17
print(dateFormatter.string(from: myDate))
请注意格式化程序默认使用设备区域的时区，对于您通过格式化程序中的timezone属性手动定义的某些应用程序，或者您可以指定所需的格式
斯威夫特3：
dateFormatter.dateStyle = .medium