问题
I am trying to change the label that you see in my screenshot that has a green background and says We Are Open.
I would like the bottom label to turn RED and say "Sorry we are closed" whenever the listed opening times have passed and then go back to GREEN and say "We Are Open" at the correct opening times.
I've managed to import date and time successfully into the top label but I'm not sure how do the bottom label.
Here is the code:
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)
}
}
回答1:
Below code i have try and it will work fine. Initially i created two UILabel with proper constraints. Then Create outlets for two label to view controller. Then try this code.
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()
}
}
Extension for swift 3:
extension Date {
func dayOfWeek() -> Int? {
let calender: Calendar = Calendar.current
let component: DateComponents = (calender as NSCalendar).components(.weekday, from: self)
return component.weekday
}
}
来源：https://stackoverflow.com/questions/38750201/changing-label-text-colour-depending-on-current-time