Swift：将开始日期和结束日期格式化为单个字符串

Question

I have these two dates in string format:

let startDate = "2018-06-14"
let endDate = "2018-06-17"

I would like to format them together as such:

June 14-17, 2018

However, if the start and end date fall on different months it should be formatted like this:

June 29 - July 1, 2018

And if the start and end date fall on different years it should be formatted like this:

December 29, 2018 - January 1, 2019

Is there an easy way of doing this using Swift's native DateFormatter ?

Is there a popular pod that can help with this?

What's the best practice to accomplish this formatting?

Answer 1

Here's my answer:

   if let startDate = startDateString.toDate(withFormat: "yyyy-MM-dd"),
        let endDate = endDateString.toDate(withFormat: "yyyy-MM-dd") {
        let formatter = DateIntervalFormatter()
        formatter.dateStyle = .long
        formatter.timeStyle = .none
        dateLabel.text = formatter.string(from: startDate, to: endDate)
    }

And this extension:

extension String {

    func toDate(withFormat format: String) -> Date? {
        let formatter = DateFormatter()
        formatter.dateFormat = format
        formatter.locale = Locale(identifier: "en_US_POSIX")
        return formatter.date(from: self)
    }

}