From：www.jianshu.com/p/41368a8c2…
1. 根据一个时间字符串转换任意样式
extension String {
func formatDate() -> String {
let dateFormatter = DateFormatter()
dateFormatter.locale = Locale.current
dateFormatter.dateFormat = "yyyy-MM-dd HH:mm:ss"
guard let formatDate = dateFormatter.date(from: self) else { return "" }
let calendar = Calendar.current
_ = calendar.component(.era, from: formatDate)
let year = calendar.component(.year, from: formatDate)
let month = calendar.component(.month, from: formatDate)
let day = calendar.component(.day, from: formatDate)
let hour = calendar.component(.hour, from: formatDate)
let minute = calendar.component(.minute, from: formatDate)
let second = calendar.component(.second, from: formatDate)
return String(format: "%.2zd年%.2zd月%.2zd日 %.2zd时:%.2zd分:%.2zd秒", year, month, day, hour, minute, second)
}
}
案列：
let dateString = "2018-08-25 20:00:00"
debugPrint(dateString.formatDate()) // "2018年08月25日 20时:00分:00秒"
2. 获取星期几
extension String {
func featureWeekday() -> String {
let dateFormatter = DateFormatter()
dateFormatter.locale = Locale.current
dateFormatter.dateFormat = "yyyy-MM-dd HH:mm:ss"
guard let formatDate = dateFormatter.date(from: self) else { return "" }
let calendar = Calendar.current
let weekDay = calendar.component(.weekday, from: formatDate)
switch weekDay {
case 1:
return "星期日"
case 2:
return "星期一"
case 3:
return "星期二"
case 4:
return "星期三"
case 5:
return "星期四"
case 6:
return "星期五"
case 7:
return "星期六"
default:
return ""
}
}
}
案列
let dateString = "2018-08-25 20:00:00"
debugPrint(dateString.featureWeekday()) // "星期六"
