Iterate through Core Data with for loop?

Question

I'm trying to add all expenses that match a certain category in an expense tracker app.

        ForEach(fetchRequestExpense) { (expenselog: Expenses) in
                if category == expenselog.expenseCategory{
                    var sum += expenselog.expenseCost
                }
            }
        return sum
    }

This won't compile. Should I be using a for loop for this type of calculation?

Asperi · Accepted Answer · 2020-10-09 03:18:06Z

1

The ForEach is a dynamic view container for constructing SwiftUI views, for control flow you have to use regular swift for/in, like

var sum = 0.0
for expenselog in fetchRequestExpense {
    if category == expenselog.expenseCategory {
        sum += expenselog.expenseCost
    }
}
return sum

answered Oct 9, 2020 at 3:18

Asperi

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Comments

malhal · Accepted Answer · 2020-10-09 05:58:24Z

1

Normally you would use an @sum fetch request and dictionary result type:

https://developer.apple.com/documentation/coredata/nsfetchrequestresulttype/1506237-dictionaryresulttype

See this similar question:

Core Data sum of all instances attribute

edited Oct 9, 2020 at 5:58

answered Oct 9, 2020 at 5:52

malhal

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