I am doing a bar chart in my SwiftUI app, however I encountered a problem...

struct ViewMonth: Identifiable {
    let id = UUID()
    let date: Date
    let viewCount: Int
}

I defined several variable types in the above code.

struct Date {
    static func from(year: Int, month: Int, day: Int) -> Date {
        let components = DateComponents(year: year, month: month, day: day)
        return Calendar.current.date(from: components)!
    }
}

It seems like I can't convert the expression type 'Foundation.Date' to 'BarCharts.Date'. I don't understand the error message. Please help!

I expect the code will yield no errors.

CodePudding user response：

The error complains about a terminology conflict of your type Date with existing Date in Foundation.

Basically there are three options:

1. Replace struct Date with extension Date.
2. Rename your struct Date as something which does not interfere with any type in the Foundation framework.
3. Declare all instances of your custom type as BarCharts.Date.

I recommend the first option.

CodePudding user response：

There are two types: Foundation.Date is the date type that everyone uses. And I suppose you defined your struct Date inside a class Barcharts, so it is a Barcharts.Date.

The “from” function is declared to return Date - which is a shortcut for Barcharts.Date. Now the error message should make sense. It’s up to you to decide what you wanted it to return.