嘗試將日期格式化程序類型（從時間選擇器）轉換為 Integer

Question

這里有點麻煩，我從名為 amPicker_out 的日期選擇器中獲取當前時間

我正在使用日期格式化程序來獲取將這兩位時間轉換為 integer 所需的分鍾數。 當我嘗試轉換它時，我收到此錯誤

“無法使用類型為 '(DateFormatter)' 的參數列表調用類型為 'Int' 的初始化程序”

有什么想法我哪里出錯了嗎？

   func getTime()
    {

        let amPickerMinutes = DateFormatter()

        amPickerMinutes.dateFormat = "mm"


      // convert amPickerMinutes to Integer
      let amPickerMinutesInt = Int(amPickerMinutes)

        print(amPickerMinutesInt)
    }

Answer 1

您正在將日期格式化程序 object 轉換為 Int，因此會出現警告。 需要做類似的事情：

    func getTime() {

        let amPickerMinutes = DateFormatter()

        amPickerMinutes.dateFormat = "mm"

        // convert amPickerMinutes to Integer
        let dateString = amPickerMinutes.string(from: amPicker_out.date)
        if let amPickerMinutesInt = Int(dateString) {
            print(amPickerMinutesInt)
        }

        // Prefer using calendar instead 
        let amPickerMinutesInt = Calendar.current.component(.minute, from: amPicker_out.date)
        print(amPickerMinutesInt)
    }

Answer 2

您正在嘗試將 DateTimeFormatter 轉換為 Int。 您必須使用此格式化程序格式化某些日期，然后將此值轉換為 Int

    func getTime(date:Date){

        let amPickerMinutes = DateFormatter()
        amPickerMinutes.dateFormat = "mm"

        let minutes = amPickerMinutes.string(from: date)
        let amPickerMinutesInt = Int(minutes)

        print(amPickerMinutesInt)

    }

getTime(date: Date()) // call your function parsing your date picker value

Answer 3

要獲取分鍾，您必須調用stringFromDate傳遞日期

let amPickerMinutes = DateFormatter()
amPickerMinutes.dateFormat = "mm"
// convert amPickerMinutes to Integer
let amPickerMinutesInt = Int(amPickerMinutes.string(from: picker.date))!

不過Calendar提供了更方便的API

let amPickerMinutesInt = Calendar.current.component(.minute, from: picker.date)