UIDatePicker快速保存時間

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我正在嘗試保存一些UIDatePickers的選定時間。我的日期選擇器被稱爲datePicker1。它目前設置爲只是小時和分鐘，我有一個「保存」按鈕，我想保存datePickers時間（小時和分鐘），並能夠在以後回調這些時間。我目前正在使用NSUserDefaults，但如果有更好的方法來做到這一點，讓我知道。（日期與它無關，我正在創建一個應用程序，每天都會通知用戶，所以我所關心的是小時和分鐘數）。任何幫助將不勝感激。UIDatePicker快速保存時間

來源

2016-05-04 Trevor Thomas

加載數據，你的問題並不在要保存的時間是什麼格式規定（例如一個字符串？小時和分鐘的整數？一個NSDate對象？） –

那麼你想要什麼？ – Lion

如果想要將小時和分鐘保存爲字符串，這可能會給您一些想法。該實施涉及的出口單的UIDatePicker和動作連接到一個「保存」按鈕：

class ViewController: UIViewController { 

@IBOutlet weak var datePicker: UIDatePicker! 

@IBAction func save(sender: UIButton) { 

    let dateOnPicker = datePicker.date //capture the date shown on the picker 

    let dateFormatter = NSDateFormatter() //create a date formatter 

    //if you want to convert time to string like "9:07 PM": 
    dateFormatter.timeStyle = NSDateFormatterStyle.ShortStyle //check out docs for NSDateFormatterStyle to see other styles 
    let timeAsString = dateFormatter.stringFromDate(dateOnPicker) 
    print(timeAsString) //ex. prints 3:04 AM as "3:04 AM" and 11:37 PM as "11:37 PM" 

    //if you want to convert time to string like "0627" (military time): 
    dateFormatter.dateFormat = "HHmm" //could also store as HH:mm if you want a colon in the string 
    let timeAsStringMilitaryTime = dateFormatter.stringFromDate(dateOnPicker) 
    print(timeAsStringMilitaryTime) //in miliatary time: ex. prints 3:04AM as "0304" and 11:37 PM as "2337" 

    //there are other options, but these are two that you might find useful! 

    //you could then save either version (whichever you end up using) to NSUserDefaults as a string; i went with the military time version since i think it's easier to parse, but just personal preference: 
    NSUserDefaults.standardUserDefaults().setObject(timeAsStringMilitaryTime, forKey: "SavedTime") 
} 

override func viewDidLoad() { 
    super.viewDidLoad() 

    //when you start up (or whenever you want to retrieve the saved time), you could check to see if you have a time saved, and if so, parse it into hours and minutes (assuming you are saving the military time version): 

    if let savedTime = NSUserDefaults.standardUserDefaults().objectForKey("SavedTime") as? String { 

     //the "HHmm" military time format will ALWAYS be 4 digits long, and the first two characters represent the hours and the second two characters represent the minutes 

     let hoursRange = savedTime.startIndex...savedTime.startIndex.advancedBy(1) //refers to the first two digits of 4-digit time) 
     let hours = savedTime[hoursRange] 

     let minutesRange = savedTime.startIndex.advancedBy(2)...savedTime.endIndex.predecessor() //refers to the last two digits of 4-digit time) 
     let minutes = savedTime[minutesRange] 

     print(hours) 
     print(minutes) 
    } 
}

希望這是有幫助的！

邁克

來源

2016-05-04 04:59:07

邁克，所以我得到如何節省時間，現在如果我想用這段時間來觸發警報，並且當該頁面被重新加載時，日期選擇器再次顯示節省的時間，我將如何做到這一點？ –

如果您使用的是UIDatePickerView：（情節板中設置時間）下列功能保存/載入時間的NSDate和因爲你的UIDatePickerView設置爲時間，只有小時/分鐘就會顯示

定義一個變量，「時間」，其中保存您選擇的日期

var date :NSDate?

使用此功能將數據保存到變量

func save(){ 
    date = datePicker1.date 
}

使用此功能從變量

func load(){ 
    if date != nil { 
     datePicker1.setDate(date!, animated: true) 
    } 
}

來源

2016-05-04 05:00:36 123FLO321

UIDatePicker快速保存時間

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