如何在swift中将月份名称数组转换为月份数字

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如何在swift中将月份名称数组转换为月份数字

此问题已有答案：

如何在Swift中找到列表项的索引？

在我的项目中，我从选择器选择月份，将月份名称放置在文本字段中。但是我必须向服务器发送月份编号。

这是我的月份数组

var monthsArray = ["JANUARY","FEBRUARY","MARCH","APRIL","MAY","JUNE","JULY","AUGUST","SEPTEMBER","OCTOBER","NOVEMBER","DECEMBER"]

在这里，我遇到了一个问题。例如，如果我选择了四月，我必须将4发送到服务器，如何完成此任务，请有人帮助/建议我。

admin 更改状态以发布 2023年5月20日
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2 答案

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这样的函数可能会有所帮助

func getMonthIndex(_ month: String) -> Int {
    let months = ["JANUARY","FEBRUARY","MARCH","APRIL","MAY","JUNE","JULY","AUGUST","SEPTEMBER","OCTOBER","NOVEMBER","DECEMBER"]
    var monthIndex = -1
    if let idx = months.index(of: month.uppercased()) {
        monthIndex = idx + 1
    }
    return monthIndex
}

其可以如下使用：

var idx = getMonthIndex("January")  //1
idx = getMonthIndex("JANUARY") //1
idx = getMonthIndex("DECEMBER") //12
idx = getMonthIndex("DECEMBERRRR") //-1

在上面的片段中，“month.uppercased()”非常重要，这将有助于识别所有情况下的月份，例如“January”、“JANUARY”或“january”。

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如果你有文本值，只需要在数组中找到该值的索引，然后再加1（因为数组以零为基础）

类似这样的代码应该可以工作：

var monthsArray = ["JANUARY","FEBRUARY","MARCH","APRIL","MAY","JUNE","JULY","AUGUST","SEPTEMBER","OCTOBER","NOVEMBER","DECEMBER"]
if let index = monthsArray.index(of: "APRIL") { // index will be 3 (zero based)
    let monthNumber = index + 1 // +1 as explained earlier
    print(monthNumber) // output: 4
}

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