Macos 使用NSPredicateEditor筛选一天的最佳方法

是否有人使用NSPredicateEditor找到了一种按天过滤数据（CoreData）的解决方案？这样做的目的是让它对用户来说最方便。标准解决方案是为日期定义两个标准：

一个用于>=一天的开始

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另一个用于的行模板可以转换

谓词中的谓词（使用subpredicates:）

，无需其他重写。在IB中，正确的表达是日期

override func predicate(withSubpredicates subpredicates: [NSPredicate]?) -> NSPredicate {
    // call super to get the predicate, for example aDate == '3.5.20210 14:03:53'
    let predicate = super.predicate(withSubpredicates: subpredicates)
    // convert the predicate to aDate >= '3.5.2021 00:00:00' AND aDate < '4.5.2021 00:00:00'
    var newPredicate = predicate
    if let comparisonPredicate = predicate as? NSComparisonPredicate,
        let predicateDate = comparisonPredicate.rightExpression.constantValue as? Date {
        let keyPath = comparisonPredicate.leftExpression.keyPath
        var components = Calendar.current.dateComponents([.year, .month, .day], from: predicateDate)
        components.hour = 0
        components.minute = 0
        components.second = 0
        components.calendar = NSCalendar.current
        switch comparisonPredicate.predicateOperatorType {
            case .lessThan:
                // aDate < '3.5.2021 00:00:00'
                let date = components.date! as NSDate
                newPredicate = NSPredicate(format: "%K < %@", keyPath,date)
            case .lessThanOrEqualTo:
                // aDate < '4.5.2021 00:00:00'
                components.day = components.day! + 1
                let date = components.date! as NSDate
                newPredicate = NSPredicate(format: "%K < %@", keyPath,date)
            case .greaterThan:
                // aDate >= '4.5.2021 00:00:00'
                components.day = components.day! + 1
                let date = components.date! as NSDate
                newPredicate = NSPredicate(format: "%K >= %@", keyPath,date)
            case .greaterThanOrEqualTo:
                // aDate >= '3.5.2021 00:00:00'
                let date = components.date! as NSDate
                newPredicate = NSPredicate(format: "%K >= %@", keyPath,date)
            case .equalTo:
                // aDate >= '3.5.2021 00:00:00' AND aDate < '4.5.2021 00:00:00'
                let startDate = components.date! as NSDate
                components.day = components.day! + 1
                let endDate = components.date! as NSDate
                newPredicate = NSPredicate(format: "%K >= %@ AND %K < %@", keyPath, startDate, keyPath, endDate)
            case .notEqualTo:
                // NOT (aDate >= '3.5.2021 00:00:00' AND aDate < '4.5.2021 00:00:00')
                let startDate = components.date! as NSDate
                components.day = components.day! + 1
                let endDate = components.date! as NSDate
                newPredicate = NSPredicate(format: "NOT (%K >= %@ AND %K < %@)", keyPath, startDate, keyPath, endDate)
            default:
                newPredicate = predicate
        }
    }
    return newPredicate
}

override func谓词（带有子谓词subpredicates:[NSPredicate]？）->NSPredicate{
//调用super获取谓词，例如aDate==“3.5.20210 14:03:53”
let predicate=super.predicate（带子谓词：子谓词）
//将谓词转换为aDate>='3.5.2021 00:00:00'和aDate<'4.5.2021 00:00:00'
var newPredicate=谓词
如果让comparisonPredicate=谓词为？NSComparisonPredicate，
让predicateDate=comparisonPredicate.rightExpression.constantValue作为？日期{
让keyPath=comparisonPredicate.leftExpression.keyPath
var components=Calendar.current.dateComponents（[.year、.month、.day]，from:predictedate）
组件。小时=0
组件。分钟=0
组件。秒=0
components.calendar=NSCalendar.current
开关比较Predicate.predicateOperatorType{
案例.莱斯特尚：
//aDate<'2021年5月3日00:00:00'
让date=components.date！作为NSDate
newPredicate=NSPredicate（格式：“%K<%@”，键路径，日期）
案例：lessThanOrEqualTo：
//aDate<'2021年5月4日00:00:00'
components.day=components.day！+1
让date=components.date！作为NSDate
newPredicate=NSPredicate（格式：“%K<%@”，键路径，日期）
案例。大于：
//日期>='4.5.2021 00:00:00'
components.day=components.day！+1
让date=components.date！作为NSDate
newPredicate=NSPredicate（格式：'%K>=%@'，键路径，日期）
案例。大于或等于：
//日期>='2021年5月3日00:00:00'
让date=components.date！作为NSDate
newPredicate=NSPredicate（格式：'%K>=%@'，键路径，日期）
案例.平等：
//aDate>='2021年5月3日00:00:00'和aDate<'2021年5月4日00:00:00'
将startDate=components.date！设为NSDate
components.day=components.day！+1
让endDate=components.date！作为NSDate
newPredicate=NSPredicate（格式：“%K>=%@和%K<%@”，键路径，起始日期，键路径，结束日期）
案例。注意事项：
//不是（aDate>='2021年5月3日00:00:00'和aDate<'2021年5月4日00:00:00'）
将startDate=components.date！设为NSDate
components.day=components.day！+1
让endDate=components.date！作为NSDate
newPredicate=NSPredicate（格式：“非（%K>=%@和%K<%@）”，键路径，起始日期，键路径，结束日期）
违约：
newPredicate=谓词
}
}
返回新谓词
}

多亏了威勒克的回答，我才得以解决。我想让您参与整个解决方案

创建自定义类CustomRowTemplate:NSPredicateEditorRowTemplate

重写func谓词，参见上面的Willeke代码。这可以访问您希望筛选的日期 它创建一个谓词，其中包含一天的日期/时间范围

在属性检查器中，为谓词编辑器为keypath和date创建一个新的行模板。 然后将其类更改为CustomRowTemplate

就这些

---

一个

NSPredicateEditorRowTemplate

子类怎么样？是的，这是我的方法。但我正在努力创建一个templateView，保留两个输入字段。在Objective下，您可以操作模板的视图。现在templateViews（）只是一个getter函数。您想要一个有两个日期的行，还是想要一个有一个日期的行和一个有两个日期的谓词？我想要一个有两个可编辑日期的行，这样我就可以将日期设置为“如何按天过滤”或“如何在这两个日期之间实现”的问题？您是如何操作Objective-C中模板的视图的？

override func predicate(withSubpredicates subpredicates: [NSPredicate]?) -> NSPredicate {
    // call super to get the predicate, for example aDate == '3.5.20210 14:03:53'
    let predicate = super.predicate(withSubpredicates: subpredicates)
    // convert the predicate to aDate >= '3.5.2021 00:00:00' AND aDate < '4.5.2021 00:00:00'
    var newPredicate = predicate
    if let comparisonPredicate = predicate as? NSComparisonPredicate,
        let predicateDate = comparisonPredicate.rightExpression.constantValue as? Date {
        let keyPath = comparisonPredicate.leftExpression.keyPath
        var components = Calendar.current.dateComponents([.year, .month, .day], from: predicateDate)
        components.hour = 0
        components.minute = 0
        components.second = 0
        components.calendar = NSCalendar.current
        switch comparisonPredicate.predicateOperatorType {
            case .lessThan:
                // aDate < '3.5.2021 00:00:00'
                let date = components.date! as NSDate
                newPredicate = NSPredicate(format: "%K < %@", keyPath,date)
            case .lessThanOrEqualTo:
                // aDate < '4.5.2021 00:00:00'
                components.day = components.day! + 1
                let date = components.date! as NSDate
                newPredicate = NSPredicate(format: "%K < %@", keyPath,date)
            case .greaterThan:
                // aDate >= '4.5.2021 00:00:00'
                components.day = components.day! + 1
                let date = components.date! as NSDate
                newPredicate = NSPredicate(format: "%K >= %@", keyPath,date)
            case .greaterThanOrEqualTo:
                // aDate >= '3.5.2021 00:00:00'
                let date = components.date! as NSDate
                newPredicate = NSPredicate(format: "%K >= %@", keyPath,date)
            case .equalTo:
                // aDate >= '3.5.2021 00:00:00' AND aDate < '4.5.2021 00:00:00'
                let startDate = components.date! as NSDate
                components.day = components.day! + 1
                let endDate = components.date! as NSDate
                newPredicate = NSPredicate(format: "%K >= %@ AND %K < %@", keyPath, startDate, keyPath, endDate)
            case .notEqualTo:
                // NOT (aDate >= '3.5.2021 00:00:00' AND aDate < '4.5.2021 00:00:00')
                let startDate = components.date! as NSDate
                components.day = components.day! + 1
                let endDate = components.date! as NSDate
                newPredicate = NSPredicate(format: "NOT (%K >= %@ AND %K < %@)", keyPath, startDate, keyPath, endDate)
            default:
                newPredicate = predicate
        }
    }
    return newPredicate
}

    override func predicate(withSubpredicates subpredicates: [NSPredicate]?) -> NSPredicate