Hi I am trying to get the current hour and minute of the day using the following code:
let calendar = NSCalendar.currentCalendar()
let components = calendar.components(.CalendarUnitHour, fromDate: NSDate())
// Concatenate time and minutes together
let hour = components.hour
let minute = components.minute
println(components.hour)
println(components.minute)
The output for both:
components.hour output: 0
components.minute output: 9223372036854775807
It is currently 00.30 where I am. But why does components.minute print such a long number that doesn't to me seem to be the minute 30.
Also if anyone can suggest another way of getting the current time as e.g. 13:00?
Any help is much appreciated thanks!
9223372036854775807 is NSUndefinedDateComponent value. This means that NSDateComponents object doesn't have the value.
You have to join desired NSCalendarUnits with |:
let components = calendar.components(.CalendarUnitHour | .CalendarUnitMinute, fromDate: NSDate())
OR, from iOS 8, we have handy component(_:fromDate:) method to get just one component's value.
let now = NSDate()
let hour = calendar.component(.CalendarUnitHour, fromDate: now)
let minute = calendar.component(.CalendarUnitMinute, fromDate: now)
Related
I'm working on a project where I have labels and images that change on a daily basis. My idea on how to go about this is I add assets for the images and have multiple files where I take the text (that contains the quote).
Two questions:
Is there a better way of approaching this? (I'm fairly new to iOS, so I'm wondering if this is sound).
How can I take the current day as in: May 22? (I just want to know how to get "22").
you need to use NSDate
// Option 1
let date = NSDate() // today
let dateStringFormatter = NSDateFormatter()
dateStringFormatter.dateFormat = "dd"
let d = dateStringFormatter.stringFromDate(date)
// d = "22"
// Option 2
let d = NSCalendar.currentCalendar().component(.Day, fromDate: NSDate()) // thanks Leo-Dabus
Reference: https://developer.apple.com/library/mac/documentation/Cocoa/Reference/Foundation/Classes/NSDateFormatter_Class/
Try taking a look at this stackoverflow link on getting the current date.
How to get the current time as datetime
According to noliv in the article you should be able do :
let date = NSDate()
let calendar = NSCalendar.currentCalendar()
let components = calendar.components(.CalendarUnitHour | .CalendarUnitMinute, fromDate: date)
let hour = components.hour
let minutes = components.minute
Hope this helps
I need a list of days of the week (with the week starting on Monday) for a timecard list. Im not sure how to achieve this. I have tried some dateByAddingUnit and subtracting from there but it hasn't produced the results I want.
Any idea how to get a list of the dates? (i.e. Monday would be 3/28/16, Tuesday 3/29/16 and so on)
Edit: missed that you want a week to always start on a Monday
let gregorian = NSCalendar(calendarIdentifier: NSCalendarIdentifierGregorian)!
let today = gregorian.startOfDayForDate(NSDate())
let startOfWeek: NSDate
if gregorian.component(.Weekday, fromDate: today) == 2 {
// Today is Monday
startOfWeek = today
} else {
// Find the last Monday prior to today
startOfWeek = gregorian.nextDateAfterDate(today, matchingUnit: .Weekday, value: 2, options: [.SearchBackwards, .MatchPreviousTimePreservingSmallerUnits])!
}
I am trying to set the minimum date to the current day on the date picker and then for the sake of user experience, set the time to 7pm or 19:00. For some reason it doesn't seem to be working. The minimum date setting works but the time doesn't get set. If I remove the minimum date line, the time gets set to 7pm, but strangely, the date gets set to Monday, Jan 1. Which isn't even this year.
Here's my code below:
datePicker.minimumDate = NSDate()
let calendar:NSCalendar = NSCalendar.currentCalendar()
let components = calendar.components([NSCalendarUnit.Hour, NSCalendarUnit.Minute], fromDate: NSDate())
components.hour = 19
components.minute = 00
datePicker.setDate(calendar.dateFromComponents(components)!, animated: true)
What am I doing wrong here?
Split that last line into:
let date = calendar.dateFromComponents(components)!
datePicker.setDate(date, animated: true)
Then look at the value of date. You'll find it is probably January 1, 2000 at the desired time.
Fix this by adding the year, month, and day components to:
let components = calendar.components([NSCalendarUnit.Hour, NSCalendarUnit.Minute], fromDate: NSDate())
In other words, you need:
let components = calendar.components([NSCalendarUnit.Year, NSCalendarUnit.Month, NSCalendarUnit.Day, NSCalendarUnit.Hour, NSCalendarUnit.Minute], fromDate: NSDate())
I am trying to create a weekly recurring local notification using Swift. Notification is going to be set to first day of every week, and in 10:00. Ofcourse I don't want to set a notification for a past date, so I need to see if now it has passed first day of week 10:00. If not, I will create notification for today 10:00, else next week monday 10:00.
I created an extension to calculate week number for current date.
extension NSDate {
func weekOfYear() -> Int {
let calendar = NSCalendar.currentCalendar()
let components = calendar.components(NSCalendarUnit.WeekOfYear, fromDate: self)
let weekOfYear = components.weekOfYear
return weekOfYear
}
}
I couldn't go any further than this. Any help is appreciated.
Regards.
There is an easier solution to your problem. You can use the nextDateAfterDate() method of NSCalendar:
let cal = NSCalendar.currentCalendar()
let comps = NSDateComponents()
comps.hour = 10
comps.weekday = cal.firstWeekday
let now = NSDate()
let fireDate = cal.nextDateAfterDate(now, matchingComponents: comps, options: [.MatchNextTimePreservingSmallerUnits])!
This gives the first date in the future which is at 10:00 on the first day of the week.
I'm having difficulties to get the right now command with the Swift 2.0, my command lists are below:
let dateNow = NSDate()
let calendar = NSCalendar.currentCalendar()
let hour = calendar.component(NSCalendarUnit.Hour, fromDate: dateNow)
let minute = calendar.component(NSCalendarUnit.Minute, fromDate: dateNow)
The error said that instances calendar cannot be used in ViewController, and what confuses me is that the line above (the let calendar = ...) clearly defines calendar as a constant but why cannot I access it for my let hour and minute? please help