如何在FSCalendar和Realm数据库中显示numberOfEventsFor日期？

Question

这是我的Realm对象：

class Transaction: Object {

    @objc dynamic var transactionAmount = 0.0
    @objc dynamic var transactionDate = Date()
    @objc dynamic var transactionName = ""
    
    }

如何根据transactionAmount属性返回1或2个点？

这是我脑海中的代码：

func calendar(_ calendar: FSCalendar, numberOfEventsFor date: Date) -> Int {
                
        let allTransactions = realm.objects(Transaction.self)
        
        for transaction in allTransactions {
            if transaction.transactionAmount > 0 && transaction.transactionAmount < 0 {
                return 2
            } else if transaction.transactionAmount > 0 || transaction.transactionAmount < 0 {
                return 1
            }
        }
        return 0
        
    }

或者如果我使用谓词：

func negativeTransactionPredicate(date: Date) -> NSPredicate {
        let calendar = Calendar(identifier: Calendar.Identifier.gregorian)
        var components = calendar.dateComponents([.year, .month, .day, .hour, .minute, .second], from: date)
        
        components.hour = 00
        components.minute = 00
        components.second = 00
        
        let startDate = calendar.date(from: components)
        
        components.hour = 23
        components.minute = 59
        components.second = 59
        
        let endDate = calendar.date(from: components)
        
        return NSPredicate(format: "transactionDate >= %@ && transactionDate =< %@ && transactionAmount < 0", argumentArray: [startDate!, endDate!])
    }

然后使用谓词过滤结果：

        let incomeTransaction = realm.objects(Transaction.self).filter(positiveTransactionPredicate(date: date))
        
        let expenseTransaction = realm.objects(Transaction.self).filter(negativeTransactionPredicate(date: date))
        
        let incomeAndExpenseTransactions = realm.objects(Transaction.self).filter(positiveAndNegativeTransactionPredicate(date: date))

        if incomeAndExpenseTransactions.contains(date) {
            return 2
        } else if incomeTransaction.contains(date) || expenseTransaction.contains(date) {
            return 1
        }

从3月份开始我还是编程新手，所以我不完全了解如何调用numberOfEventsFor委托，而且我真的不知道如何将其与Realm相关联。

我非常感谢您的帮助。