更改标签文字＆amp;颜色取决于当前时间

Question

我正在尝试更改您在屏幕截图中看到的带有绿色背景的标签，并说我们打开了。

我希望底部标签变成红色，并且只要列出的开放时间已经过去，就说“抱歉我们已关闭”，然后回到绿色并在正确的开放时间说“我们打开”。

我已成功将日期和时间导入顶级标签，但我不确定底部标签是怎样的。

以下是代码：

import UIKit
import Firebase
import FirebaseInstanceID
import FirebaseMessaging

class FirstViewController: UIViewController {

    var timer = Timer()

    @IBOutlet weak var timeLabel: UILabel!

    @IBOutlet weak var openStatusLabel: UILabel!


    override func viewDidLoad() {
        super.viewDidLoad()
        // Do any additional setup after loading the view, typically from a nib.

        FIRMessaging.messaging().subscribe(toTopic: "/topics/news")

        self.timer = Timer.scheduledTimer(timeInterval: 1.0,
                                                            target: self,
                                                            selector: #selector(FirstViewController.tick),
                                                            userInfo: nil,
                                                            repeats: true)
    }

    @objc func tick() {
        timeLabel.text = DateFormatter.localizedString(from: NSDate() as Date,
                                                               dateStyle: .medium,
                                                               timeStyle: .medium)
    }

}

Answer 1

下面的代码我试过，它会正常工作。最初我创建了两个具有适当约束的import UIKit extension NSDate { func dayOfWeek() -> Int? { guard let calender: NSCalendar = NSCalendar.currentCalendar(), let component: NSDateComponents = calender.components(.Weekday, fromDate: self) else { return nil } return component.weekday } } class ViewController: UIViewController { @IBOutlet var timeOfTheDay: UILabel! //Top Label for showing current time @IBOutlet var Status: UILabel! //Status Label for showing open or close override func viewDidLoad() { super.viewDidLoad() self.dateCheck() } func dateCheck() { let today = NSDate().dayOfWeek() if today == 1 { //print("Sunday") self.closed() } else if today == 2 { //print("Monday") self.closed() } else if today == 3 { //print("Tuesday") self.uptoEvening() } else if today == 4 { //print("Wednesday") self.uptoNight() } else if today == 5 { // print("Thursday") self.uptoNight() } else if today == 6 { //print("Friday") self.uptoNight() } else { //print("Saturday") self.uptoEvening() } } func getTime() -> (hour:Int, minute:Int, second:Int) { let currentDateTime = NSDate() let calendar = NSCalendar.currentCalendar() let component = calendar.components([.Hour,.Minute,.Second], fromDate: currentDateTime) let hour = component.hour let minute = component.minute let second = component.second return (hour,minute,second) } func closed() { timeOfTheDay.text = String(getTime().hour)+" : "+String(getTime().minute)+" : "+String(getTime().second) timeOfTheDay.backgroundColor = UIColor.redColor() timeOfTheDay.textColor = UIColor.whiteColor() Status.text = "Sorry! Today, We are Closed!" Status.backgroundColor = UIColor.redColor() Status.textColor = UIColor.whiteColor() } func opened(endTime:String) { timeOfTheDay.text = String(getTime().hour)+" : "+String(getTime().minute)+" : "+String(getTime().second) timeOfTheDay.backgroundColor = UIColor.greenColor() timeOfTheDay.textColor = UIColor.whiteColor() Status.text = "Hi! still we are opened upto "+endTime Status.backgroundColor = UIColor.greenColor() Status.textColor = UIColor.whiteColor() } func uptoEvening() { let time = getTime().hour switch time { case 09...16: opened("17") //set time for 09:00 to 16:59 default:closed() } } func uptoNight() { let time = getTime().hour switch time { case 09...20: opened("21") //set time for 09:00 to 20:59 default:closed() } } override func didReceiveMemoryWarning() { super.didReceiveMemoryWarning() } } 。然后为两个标签创建出口以查看控制器。然后试试这段代码。

extension Date {
    func dayOfWeek() -> Int? {
            let calender: Calendar = Calendar.current
            let component: DateComponents = (calender as NSCalendar).components(.weekday, from: self)
        return component.weekday
    }
}

swift 3的扩展名

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