string - 在字符串中省略nil

我正在练习快速，目前正在编写一个简单的函数来显示一天的时间表。如果return语句包含一个值，则应仅包括busyDay。我希望这可以自动完成，但不是。

func scheduleToday (date: String, day: String, numberOfMeetings: Int?) -> String {
    var meetingMessage = ""
    var busyDay: String!

    if var meetings = numberOfMeetings {
        if meetings > 4 {
           busyDay = "Today is a busy day!"
        }
       meetingMessage = "\(meetings) meetings"
    } else {
        meetingMessage = "no meetings today."
     }

    return "| \(date) - \(day) |   Good morning. \(busyDay) You have \(meetingMessage)."
}

如果numberOfMeetings为4或更小，则返回的字符串为：

// | 17th of June - Wedensday |   Good morning. nil You have 3 meetings.

最佳答案

您可以在if中添加else语句，将budyDay设置为空字符串

if meetings > 4 {
    busyDay = "Today is a busy day!"
} else {
    busyDay = ""
}