Swift:查找并绘制两个日期之间的小时数

import Foundation

func hoursBetweenDates(startDate: Date, endDate: Date) -> Int {
    let calendar = Calendar.current
    let components = calendar.dateComponents([.hour], from: startDate, to: endDate)
    return components.hour ?? 0
}

let dateFormatter = DateFormatter()
dateFormatter.dateFormat = "yyyy-MM-dd HH:mm:ss"

let startDateString = "2022-01-01 10:00:00"
let endDateString = "2022-01-01 15:30:00"

if let startDate = dateFormatter.date(from: startDateString),
   let endDate = dateFormatter.date(from: endDateString) {
    let hours = hoursBetweenDates(startDate: startDate, endDate: endDate)
    print("两个日期之间的小时数为：\(hours)小时")
} else {
    print("日期格式不正确")
}