被 UIDatePicker 淹没了。试图在 viewDidLoad() 中为 func 预设 .hour 和 .minute

Question

我花了 2.5 个小时搜索谷歌，我想我这辈子从来没有在谷歌搜索第 10 页上过。直到今天。

我是 swift 的新手，我希望应用程序打开新的 viewcontroller 并使用 UIDatePicker (datepickermode: time) 预设为用户选择他最后一次使用 datepicker 设置时间的时间。如果有帮助的话，基本上就像 iphone 闹钟一样？

包含 .hour 和 .minute（整数）的结构 'Time' 有自己的类。

我想要一个用 viewDidLoad() 执行并设置时间选择器的小函数。

   @IBAction func timePicker(_ sender: UIDatePicker) {
    let picker = timePicker.date
    getTime(date: picker)
    print(globalTime.savedTime)
}

func oldTime(withTime: TimeStruct.Time) {

    var newTime = DateComponents()
    newTime.hour = withTime.hour
    newTime.minute = withTime.minute

    var newDate = Date()

    timePicker.calendar.

    //blabliblub i've lost it here. the code makes no sense anymore



}

func getTime(date: Date) {

let components = Calendar.current.dateComponents([.hour, .minute], from: date)
globalTime.savedTime.hour = components.hour!
globalTime.savedTime.minute = components.minute!

}

getTime 保存设置后的时间。 oldTime 在再次查看时将之前设置的时间提供给选择器以再次更改。

用户设置时间并单击保存按钮，将当前小时和分钟保存到“时间”类型的变量中

哦，如果可能的话，请帮助我使用 Date()，而不是 NSDate()。

非常感谢您的宝贵时间！

菲利克斯✌️

Answer 1

希望这对任何人都有帮助。感谢您的进一步帮助:)

import UIKit

var globalTime = TimeStruct()

class Time_Setting: UIViewController {

func oldTime(withTime: TimeStruct.Time) {

    let newHour = withTime.hour
    let newMinute = withTime.minute
    let someDate = Date()

    let newTimePicker = timePicker.calendar.date(bySettingHour: newHour, minute: newMinute, second: 0, of: someDate)

    timePicker.date = newTimePicker!

    }
}

另一个文件：

import UIKit

class TimeStruct {

struct Time {
    var hour: Int
    var minute: Int
}

var savedTime = Time(hour: 07, minute: 00)
}

Answer 2

您是否尝试过使用普通的选择器？日期选择器是具有某些内置功能的模板。但是，普通人可能能够完成您需要它做的所有事情。例如，只需创建一个包含 3 个组件（0,1 和 2）的普通选择器，这些组件通过执行以下操作来控制 Hour Minute 和 PM/AM：

override func viewDidLoad() {
    super.viewDidLoad()
    // Do any additional setup after loading the view.

    self.Picker.delegate = self
    self.Picker.dataSource = self
    PickerData = [["0","1",/*...*/,"9"],["0","1",/*...*/,"9"],["AM","PM"]]
    self.Picker.selectRow(row: /*var*/, inComponent: /*component*/, animated: /*bool*/)
} /*Insert data from previous session above via a variable*/

和

func numberOfComponents(in: UIPickerView) -> Int {
    return 3
}

//Number of rows
func pickerView(_ pickerView: UIPickerView, numberOfRowsInComponent component: Int) -> Int {
    return PickerData[component].count
}

//Data to return for the row and column being read
func pickerView(_ pickerView: UIPickerView, titleForRow row: Int, forComponent component: Int) -> String? {
    return PickerData[component][row]
}

//Catpure the picker view selection
func pickerView(_ pickerView: UIPickerView, didSelectRow row: Int, inComponent component: Int) {
    // This method is triggered whenever the user makes a change to the picker selection.
    // The parameter named row and component represents what was selected.
}