swift - 在swift中连接两个int

Question

我尝试连接两个整数值(当前小时和当前分钟)。例如:

int1: 18
int2: 2

然后我希望它们是一个整数:182。我使用以下代码获取当前小时和当前分钟:

// get the current date and time
    let currentDateTime = Date()

    // get the user's calendar
    let userCalendar = Calendar.current

    // choose which date and time components are needed
    let requestedComponents: Set<Calendar.Component> = [
        .year,
        .month,
        .day,
        .hour,
        .minute,
        .second
    ]

    // get the components
    let dateTimeComponents = userCalendar.dateComponents(requestedComponents, from: currentDateTime)

    // now the components are available
    let dtHour = dateTimeComponents.hour   
    let dtMinute = dateTimeComponents.minute 

然后我想我可以在将这两个整数转换为字符串时连接它们，然后再转换回 int，这样我就有了大的 int 值。我使用以下几行完成了此操作:

let strHour = String(describing: dtHour)
    let strMinute = String(describing: dtMinute)

    var currenttime : String = strHour
    currenttime += strMinute

    //reconvert to int
    let ct: Int? = Int(currenttime)

    print("currentTime as Int   : ", ct)
    print("currenttime as String: ", currenttime)

第一次打印的输出是:

currentTime as Int : nil

第二次打印的输出是:

currenttime as String: Optional(18)Optional(2)

是的，我知道我必须解决分钟问题，如果当前分钟小于十，我必须首先插入一个零，但我不明白为什么我不能将字符串转换回 int 所以这是一个大字符串。

那么有没有一种正确的方法来连接两个整数，然后将它们重新转换回一个单一的大 int 值？

Answer 1

下面的代码打印:

作为 Int 的当前时间:2249

当前时间为字符串:2249

    // get the current date and time
    let currentDateTime = Date()

    // get the user's calendar
    let userCalendar = Calendar.current

    // choose which date and time components are needed
    let requestedComponents: Set<Calendar.Component> = [
        .year,
        .month,
        .day,
        .hour,
        .minute,
        .second
    ]

    // get the components
    let dateTimeComponents = userCalendar.dateComponents(requestedComponents, from: currentDateTime)

    // now the components are available
    let dtHour = dateTimeComponents.hour   
    let dtMinute = dateTimeComponents.minute

    let strHour = String(dtHour!.description)
    let strMinute = String(dtMinute!.description)

    var currenttime : String = strHour!
    currenttime += strMinute!

    //reconvert to int
    let ct = Int(currenttime)

    print("currentTime as Int   : ", ct!)
    print("currenttime as String: ", currenttime)