Question

我得到一个没有初始化器错误的类。这不是我上课的方式吗？这用于领域对象数据库，即我要存储的属性。我是快速入门的新手，但我认为这是可以做到的。如果我取出init（）函数并仅分配它可以工作的所有值，但是，诸如justTook之类的属性以及我不希望使用的所有属性都以一个值开头，则需要在程序后面进行设置。

这是我的代码：

class MedInfo: Object {
    //  Info To Be Stored
    @objc dynamic var keyID = UUID().uuidString
    @objc dynamic var medName: String
    @objc dynamic var medDose: String
    @objc dynamic var currentDate: Date
    @objc dynamic var timeTook: Date
    @objc dynamic var lastTook: Date
    @objc dynamic var durationOfTime: Date
    @objc dynamic var doctorName: String
    @objc dynamic var rxDate: Date
    @objc dynamic var medInfo: String
    @objc dynamic var pictureOfMed: UIImage

    override static func primaryKey() -> String? {
        return "keyID"
    }

    convenience init(medName: String, medDose: String, currentDate: Date, timeTook: Date, lastTook: Date, durationOfTime: Date, doctorName: String,rxDate: Date, medInfo: String, pictureOfMed: UIImage) {
        self.medName = medName
        self.medDose = medDose
        self.currentDate = currentDate
        self.timeTook = timeTook
        self.lastTook = lastTook
        self.durationOfTime = durationOfTime
        self.doctorName = doctorName
        self.rxDate = rxDate
        self.medInfo = medInfo
        self.pictureOfMed = pictureOfMed
    }

Answer 1

您需要为所有参数设置默认值，如文档中模糊描述的那样。来自here：

在Swift中使用Realm时，Swift.reflect（_ :)函数用于确定有关模型的信息，这需要调用 init（）成功。 这意味着所有非可选属性都必须具有默认值。

所有示例都说明了这一点，因此请遵循它们。因此，应该声明您的课程：

class MedInfo: Object {
    //  Info To Be Stored
    @objc dynamic var keyID = UUID().uuidString
    @objc dynamic var medName: String = ""
    @objc dynamic var medDose: String = ""
    @objc dynamic var currentDate: Date = Date()
    @objc dynamic var timeTook: Date = Date()
    @objc dynamic var lastTook: Date = Date()
    @objc dynamic var durationOfTime: Date = Date()
    @objc dynamic var doctorName: String = ""
    @objc dynamic var rxDate: Date = Date()
    @objc dynamic var medInfo: String = ""

    // UIImage not supported, you'll need to store a URL/filename or something else
    @objc dynamic var pictureOfMed: UIImage

Answer 2

您必须调用init来创建实例。

convenience init(medName: String, medDose: String, currentDate: Date, timeTook: Date, lastTook: Date, durationOfTime: Date, doctorName: String,rxDate: Date, medInfo: String, pictureOfMed: UIImage) {

    self.init() 

    self.medName = medName
    self.medDose = medDose
    self.currentDate = currentDate
    self.timeTook = timeTook
    self.lastTook = lastTook
    self.durationOfTime = durationOfTime
    self.doctorName = doctorName
    self.rxDate = rxDate
    self.medInfo = medInfo
    self.pictureOfMed = pictureOfMed
}

Answer 3

正如@ces在Realm文档中已正确引用：“ 这意味着所有非可选属性都必须具有默认值。”

这就是为什么我认为创建Realm对象的最佳方法是将变量声明为可选变量。

这样，您将不必调用init。这是我创建自己的Realm对象的方式，也是大多数人创建它们的方式。

所以您的对象看起来像这样：

class MedInfo: Object {
//  Info To Be Stored
@objc dynamic var keyID = UUID().uuidString
@objc dynamic var medName: String?
@objc dynamic var medDose: String?
@objc dynamic var currentDate: Date?
@objc dynamic var timeTook: Date?
@objc dynamic var lastTook: Date?
@objc dynamic var durationOfTime: Date?
@objc dynamic var doctorName: String?
@objc dynamic var rxDate: Date?
@objc dynamic var medInfo: String?
@objc dynamic var pictureOfMed: UIImage?

override static func primaryKey() -> String? {
    return "keyID"
}

类没有初始化程序错误领域类Swift

3 个答案: