FSCalendar in iOS Swift

‘FSCalendar‘ is a fully customizable iOS calendar library. So its property is fully useful.

It is an open-source iOS calendar. It supports horizontal, portrait sliding mode, and other functions.

To successfully integrate the FSCalendar we have to follow the following steps:-

Step To Integrate FSCalendar

Step 1:– Add ‘FSCalendar’ In The Project.

Before we start first integrate FSCalendar into your Xcode project using CocoaPods.

target 'MyAPP' do 
    pod 'FSCalendar' 
end

target 'MyAPP' do

pod 'FSCalendar'

end

Step 2:- Now follows the below points.

(i) Drag an UIView object to ViewController Scene.

(ii) Change the Custom Class to FSCalendar.

After following the above two points. It will look like the below-mentioned screenshot.

Step 3:- Next part is it’s ‘FSCalendarDataSource‘ and ‘FSCalendarDelegate’.

Add ‘FSCalendarDataSource‘ and ‘FSCalendarDelegate’ in your view controller. So that we can use its delegates and data source methods.

Now we will look into this.

1) First, we see FSCalendardataSource.

The following ‘FSCalendardataSource’ method is:-

‘titleForDate’

==> Asks the dataSource for a title for the specific date.

‘subtitleForDate’

==> Asks the dataSource for a subtitle.

‘imageForDate’

==> Asks the dataSource for an image for the specific date.

‘minimumDateForCalendar’

==> Asks the dataSource the minimum date to display.

‘maximumDateForCalendar’

==> Asks the dataSource the maximum date to display.

‘cellForDate’

==> Asks the data source for a cell to insert in a particular data of the calendar.

Let see some Example.

The following method is:-

//Set Minimum Date 
func minimumDate(for calendar: FSCalendar) -> Date { 
       return Date() 
} 

//Set maximum Date 
func maximumDate(for calendar: FSCalendar) -> Date {
      let dateFormatter = DateFormatter() 
      dateFormatter.dateFormat = "YYYY-MM-dd" 
      return dateFormatter.date(from: "2050-01-01") ?? Date() 
}

//Set Minimum Date

func minimumDate(for calendar: FSCalendar) -> Date {

return Date()

}

//Set maximum Date

func maximumDate(for calendar: FSCalendar) -> Date {

let dateFormatter = DateFormatter()

dateFormatter.dateFormat = "YYYY-MM-dd"

return dateFormatter.date(from: "2050-01-01") ?? Date()

}

Before using cellfor we first have to register the cell. After that, we can use cellFor date.

The following method is:-

bookingCalendar.register(FSCalendarCell.self, forCellReuseIdentifier: "CELL")

1	bookingCalendar.register(FSCalendarCell.self, forCellReuseIdentifier: "CELL")

func calendar(_ calendar: FSCalendar, cellFor date: Date, at position: FSCalendarMonthPosition) -> FSCalendarCell {
       let cell: FSCalendarCell = calendar.dequeueReusableCell(withIdentifier: "CELL", for: date, at: position)
       let dateFromStringFormatter = DateFormatter();
       dateFromStringFormatter.dateFormat = "YYYY-MM-dd";
       let calendarDate = dateFromStringFormatter.string(from: date)
       
// Disable date is string Array of Dates
       if disableDates?.contains(calendarDate) ?? false || weekToBedisable{
             cell.isUserInteractionEnabled = false;
        }else{
             cell.isUserInteractionEnabled = true;

         }
       return cell;

 }

func calendar(_ calendar: FSCalendar, cellFor date: Date, at position: FSCalendarMonthPosition) -> FSCalendarCell {

let cell: FSCalendarCell = calendar.dequeueReusableCell(withIdentifier: "CELL", for: date, at: position)

let dateFromStringFormatter = DateFormatter();

dateFromStringFormatter.dateFormat = "YYYY-MM-dd";

let calendarDate = dateFromStringFormatter.string(from: date)

// Disable date is string Array of Dates

if disableDates?.contains(calendarDate) ?? false || weekToBedisable{

cell.isUserInteractionEnabled = false;

}else{

cell.isUserInteractionEnabled = true;

}

return cell;

}

2) Now, we see FSCalendarDelegate

The following method is:-

‘shouldSelectDate’

==> It specifies whether date is allowed to be selected by tapping.

‘didSelectDate’

==> It specifies date in the calendar is selected by tapping.

‘shouldDeselectDate’

==> date is allowed to be deselected by tapping.

‘didDeselectDate’

==> It tells calendar is deselected by tapping.

‘willDisplayCell’

==> Tells the delegate that the specified cell is about to be displayed on the calendar.

‘calendarCurrentPageDidChange’

==> Tells the delegate the calendar is about to change the current page.

Now we see some examples of ‘FSCalendarDelegate’

The following method is:-

// This delegate call when date is selected
func calendar(_ calendar: FSCalendar, didSelect date: Date, at monthPosition: FSCalendarMonthPosition) {
         print(date)

}

// This delegate call when date is DeSelected 
func calendar(_ calendar: FSCalendar, didDeselect date: Date, at monthPosition: FSCalendarMonthPosition) {
         print(date)
}

// This delegate call when date is selected

func calendar(_ calendar: FSCalendar, didSelect date: Date, at monthPosition: FSCalendarMonthPosition) {

print(date)

}

// This delegate call when date is DeSelected

func calendar(_ calendar: FSCalendar, didDeselect date: Date, at monthPosition: FSCalendarMonthPosition) {

print(date)

}

Conclusion

So please follow the above step to integrate FSCalendar, and if you have any issue or suggestion you can leave your query/suggestion in the comment section.

. . .

Vicky Kumar 30 September 2020

. . .

6 comments

Lokesh Patil Dec 1, 2020 at 5:50 pm

Hii,
1) I am facing a issue with calander when i call did tab method its returns me one day before date like if i click on 6 dec it gives me 5 dec
2) I need to show blur date which is not selectable for this what should i do.
3) I need an array of multiple dates if i select multiple dates.

Vicky Kumar (Moderator) Dec 4, 2020 at 7:35 pm
1) I am facing a issue with calander when i call did tab method its returns me one day before date like if i click on 6 dec it gives me 5 dec

==> Use the below date extension

extension Date {
// Convert UTC (or GMT) to local time

func toLocalTime() -> Date {

let timezone = TimeZone.current

let seconds = TimeInterval(timezone.secondsFromGMT(for: self))

return Date(timeInterval: seconds, since: self)

}

// Convert local time to UTC (or GMT)

func toGlobalTime() -> Date {

let timezone = TimeZone.current

let seconds = -TimeInterval(timezone.secondsFromGMT(for: self))

return Date(timeInterval: seconds, since: self)

}

}

And in didSelect method use like => date.toLocalTime()

2) I need to show blur date which is not selectable for this what should i do.
==> Check below example

func calendar(_ calendar: FSCalendar, cellFor date: Date, at position: FSCalendarMonthPosition) -> FSCalendarCell {
let cell: FSCalendarCell = calendar.dequeueReusableCell(withIdentifier: “CELL”, for: date, at: position)
let dateFromStringFormatter = DateFormatter()
dateFromStringFormatter.dateFormat = “YYYY-MM-dd”
let calendarDate = dateFromStringFormatter.string(from: date)
let weekDays = getDayOfWeek(calendarDate) ?? “”
var weekToBedisable: Bool = false
if disabledays?.contains(weekDays) ?? false{
weekToBedisable = true
}

if disableDates?.contains(calendarDate) ?? false || weekToBedisable{
cell.isUserInteractionEnabled = false
}else{
cell.isUserInteractionEnabled = true

}
return cell

}

func calendar(_ calendar: FSCalendar, appearance: FSCalendarAppearance, titleDefaultColorFor date: Date) -> UIColor? {
let dateFromStringFormatter = DateFormatter()
dateFromStringFormatter.dateFormat = “YYYY-MM-dd”
let calendarDate = dateFromStringFormatter.string(from: date)
var weekToBedisable: Bool = false
let weekDays = getDayOfWeek(calendarDate) ?? “”
if disabledays?.contains(weekDays) ?? false{
weekToBedisable = true
}
if disableDates?.contains(calendarDate) ?? false || weekToBedisable{
return .lightGray
}else{
return nil
}
}

func getDayOfWeek(_ today:String)->String? {
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 String(weekDay)
}

3) I need an array of multiple dates if i select multiple dates.
==> Enable MultipleSelction
bookingCalendar.allowsMultipleSelection = true

Reply

ortal Dec 14, 2020 at 4:39 pm

Hi,
I’m having some issues with the code, not quite understand where should I put this line bookingCalendar.register(FSCalendarCell.self, forCellReuseIdentifier: “CELL”),
sorry for the question i’m a beginner

Vicky Kumar (Moderator) May 27, 2021 at 12:08 pm
You have to add in the same viewController in which you are using FSCalendar.

Reply

Ummer akbar Aug 26, 2021 at 9:52 am

getting below exception
Terminating app due to uncaught exception ‘The cell class must be a subclass of FSCalendarCell.’, reason: ”

Vicky Kumar (Moderator) Sep 27, 2021 at 10:38 am
You have to also register the FSCalendarCell in the viewDidLoad

bookingCalendar.register(FSCalendarCell.self, forCellReuseIdentifier: “CELL”)

Reply

FSCalendar in iOS Swift

Step To Integrate FSCalendar

Let see some Example.

Before using cellfor we first have to register the cell. After that, we can use cellFor date.

Now we see some examples of ‘FSCalendarDelegate’

Conclusion

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