How to declare a global variable? - ios

Question

This is a very simple question, I am getting the day of a week using a snippet
if let weekday = getDayOfWeek("2017-05-01") {
print(weekday)
} else {
print("bad input")
}
func getDayOfWeek(_ today:String) -> Int? {
let formatter = DateFormatter()
formatter.dateFormat = "yyyy-MM-dd"
guard let todayDate = formatter.date(from: today) else { return nil }
let myCalendar = Calendar(identifier: .gregorian)
let weekDay = myCalendar.component(.weekday, from: todayDate)
return weekDay
}
I need to create "weekday" as global variable can any one help.
What I did is:
class ViewController: UIViewController{
var weekday = NSInteger()
}
I am getting some error in snippet while declaring as above.

Answer 1

Declare currentWeekDay type to Int.
var weekday = Int()
Now access this instance property with if let.
if let weekday = getDayOfWeek("2017-05-01") {
//weekday has block scope and available only with in this if block
self.weekday = weekday
} else {
print("bad input")
}
Edit: Set timezone to get correct weekday
func getDayOfWeek(_ today:String) -> Int? {
let formatter = DateFormatter()
formatter.dateFormat = "yyyy-MM-dd"
formatter.timeZone = TimeZone(abbreviation: "UTC")!
guard let todayDate = formatter.date(from: today) else { return nil }
let myCalendar = Calendar(identifier: .gregorian)
let weekDay = myCalendar.component(.weekday, from: todayDate)
return weekDay
}