通过单击按钮将当前日期保存到 NSUserDefaults

Question

我一直在尝试通过单击 NSUserDefaults 按钮将当前日期保存在 iPhone 上，但它不起作用。我真的不知道如何获取当前日期，将其保存为 var 并在函数中调用它。但我试过了：

  @IBAction func saveButtonTapped (sender:AnyObject){

    var date = NSDate()

    var userDefaults:NSUserDefaults = NSUserDefaults.standardUserDefaults()

    var timeList:NSMutableArray? = userDefaults.objectForKey("timeList") as? NSMutableArray

    var dataSet:NSMutableDictionary = NSMutableDictionary()
    dataSet.setObject(date, forKey: "time")

    if ((timeList) != nil){
        var newMutableList:NSMutableArray = NSMutableArray();

        for dict:AnyObject in timeList!{
            newMutableList.addObject(dict as NSDictionary)
        }

        userDefaults.removeObjectForKey("timeList")
        newMutableList.addObject(dataSet)
        userDefaults.setObject(newMutableList, forKey: "timeList")

    }else{
        userDefaults.removeObjectForKey("timeList")
        timeList = NSMutableArray()
        timeList!.addObject(dataSet)
        userDefaults.setObject(timeList, forKey: "timeList")
    }
    userDefaults.synchronize()
}

Answer 1

你可以试试这个。

 @IBAction func saveButtonTapped (sender:AnyObject){

    let userDefaults = NSUserDefaults.standardUserDefaults()

    if var timeList = userDefaults.objectForKey("timeList") as? [NSDate]
    {
        timeList.append(NSDate())
        userDefaults.setObject(timeList, forKey: "timeList")
    }
    else
    {
        userDefaults.setObject([NSDate()], forKey: "timeList")
    }
    userDefaults.synchronize()
}

回读列表

if let timeList = NSUserDefaults.standardUserDefaults().objectForKey("timeList") as? [NSDate]
{
    println(timeList)
}

通过单击按钮将当前日期保存到 NSUserDefaults

Save current date via button click into NSUserDefaults

xcode

nsdate

nsuserdefaults

swift