How to add or minus 1 month from current date? - swiftui

Question

I need to be able to add or minus 1 month from the current date.
So far I have this code:
import SwiftUI
struct DateView: View {
static let dateFormat: DateFormatter = {
let formatter = DateFormatter()
formatter.setLocalizedDateFormatFromTemplate("yyyy MMMM")
return formatter
}()
var date = Date()
var body: some View {
HStack {
Button(action: {
print("Button Pushed")
}) {
Image(systemName: "chevron.left")
.padding()
}
Spacer()
Text("\(date, formatter: Self.dateFormat)")
Spacer()
Button(action: {
print("Button Pushed")
}) {
Image(systemName: "chevron.right")
.padding()
}
}
.padding()
.background(Color.yellow)
}
}
struct DateView_Previews: PreviewProvider {
static var previews: some View {
DateView()
}
}
I would like to change the date displayed to be +1 month or -1 month depending on which chevron I will tap.
I am new to swift and swiftui and don't know what action I should use. I think it's related to DateComponents, but what should I do about it now? I am stuck. Please help me.
To better visualise what I have and want to do, here is an image of my current result:

Answer 1

Swift 5
Function to add or subtract month from current date.
func addOrSubtractMonth(month: Int) -> Date {
Calendar.current.date(byAdding: .month, value: month, to: Date())!
}
Now calling the function
// Subtracting
var monthSubtractedDate = addOrSubtractMonth(-7)
// Adding
var monthAddedDate = addOrSubtractMonth(7)
To Add date pass prospective value
To Subtract pass negative value

Answer 2

You can use the Calendar to add or subtract months/days/hours etc to your Date. Apple's documentation on the Calendar can be found here.
Below is a working example, showing how to increase/decrease the month by 1.
struct ContentView: View {
static let dateFormat: DateFormatter = {
let formatter = DateFormatter()
formatter.setLocalizedDateFormatFromTemplate("yyyy MMMM")
return formatter
}()
#State var date = Date()
var body: some View {
HStack {
Button(action: {
print("Button Pushed")
self.changeDateBy(-1)
}) {
Image(systemName: "chevron.left")
.padding()
}
Spacer()
Text("\(date, formatter: Self.dateFormat)")
Spacer()
Button(action: {
print("Button Pushed")
self.changeDateBy(1)
}) {
Image(systemName: "chevron.right")
.padding()
}
}
.padding()
.background(Color.yellow)
}
func changeDateBy(_ months: Int) {
if let date = Calendar.current.date(byAdding: .month, value: months, to: date) {
self.date = date
}
}
}