Question

我有一个使用以下代码的对象

    name = "Toma"
    let toma = setupPet(name, family: "Hawn", stage: 1, imageName: "hawn_toma", imageNamef: "", imageNameEgg: "hawn_egg", hatchEXP: 5000, desc: "", eggDesc: "", rarity: "Common")

    name = "Hawn"
    let hawn = setupPet(name, family: "Hawn", stage: 2, imageName: "hawn", imageNamef: "", imageNameEgg: "hawn_egg", hatchEXP: 5000, desc: "", eggDesc: "", rarity: "Common")
    hawn.basePet = toma

    let tomaToHawn = NSEntityDescription.insertNewObjectForEntityForName("Evolution", inManagedObjectContext: self.appData.moc) as! Evolution
    tomaToHawn.evolveTo = hawn
    tomaToHawn.howEvolve = "Level"
    tomaToHawn.evolveValue = "10"

    NSLog("\(tomaToHawn.evolveTo!.name)")

    toma.addEvolveToObject(tomaToHawn)

    NSLog("\(tomaToHawn.evolveTo!.name)")

现在两个NSLog的结果给出了不同的值，

可选（ “霍恩”）

可选（ “托马”）

所以在addEvolveToObject调用之后它发生了变化该方法包括

class Pet: NSManagedObject {

    func addEvolveToObject(value:Evolution) {
        let items = self.mutableSetValueForKey("evolveTo");
        items.addObject(value)
    }

}

我也尝试使用@NSManaged func添加进化，但得到相同的结果。将对象添加到nsset后，evolveto将被设置为要添加到的宠物。其他字段保留正确的数据

编辑我已将问题缩小到addEvolveToObject方法。如果我在items.addobject调用之前使用NSLog（“Pet CD：（value.evolveTo？.name）”）打印它会给出正确的值，但如果我在语句后打印相同的值，则会给出不同的值

IE：

func addEvolveToObject(value:Evolution) {
    NSLog("********************************************************************")
    let items = self.mutableSetValueForKey("evolveTo");
    NSLog("Pet CD: \(value.evolveTo?.name)")
    items.addObject(value)
    NSLog("Pet CD: \(value.evolveTo?.name)")
    NSLog("********************************************************************")
}

给出

宠物CD：可选（“Mel”）

宠物CD：可选（“Joan”）

如果我注释掉添加对象行，两个NSLog都会给出正确的结果

班级代码：设置 - 只需设置数据库导入UIKit 导入CoreData

class Setup: NSObject {

    let appData : AppData = AppData.sharedInstance

    func setup() {
            // Hawn
        name = "Toma"
        let toma = setupPet(name, family: "Hawn", stage: 1, imageName: "hawn_toma", imageNamef: "", imageNameEgg: "hawn_egg", hatchEXP: 5000, desc: "", eggDesc: "", rarity: "Common")

        name = "Hawn"
        let hawn = setupPet(name, family: "Hawn", stage: 2, imageName: "hawn", imageNamef: "", imageNameEgg: "hawn_egg", hatchEXP: 5000, desc: "", eggDesc: "", rarity: "Common")
        hawn.basePet = toma

        let tomaToHawn = NSEntityDescription.insertNewObjectForEntityForName("Evolution", inManagedObjectContext: self.appData.moc) as! Evolution
        tomaToHawn.evolveTo = hawn
        tomaToHawn.howEvolve = "Level"
        tomaToHawn.evolveValue = "10"

        toma.addEvolveToObject(tomaToHawn)

        appData.saveContext()
    }
    func setupPet(name : String, family : String, stage : NSNumber, imageName : String, imageNamef : String, imageNameEgg : String, hatchEXP : NSNumber, desc : String, eggDesc : String, rarity : String) -> Pet {

        let pet : Pet = NSEntityDescription.insertNewObjectForEntityForName("Pet",inManagedObjectContext: appData.moc) as! Pet
        pet.name = name
        pet.family = family
        pet.stage = stage
        pet.imageName = imageName
        pet.imageNamef = imageNamef
        pet.imageNameEgg = imageNameEgg
        pet.hatchEXP = hatchEXP
        pet.rarity = rarity
        pet.desc = desc
        pet.eggDesc = eggDesc

        return pet
    }
}

Pet - 核心数据属性类

import Foundation
import CoreData

extension Pet {

    @NSManaged var desc: String?
    @NSManaged var eggDesc: String?
    @NSManaged var family: String?
    @NSManaged var gained: NSNumber?
    @NSManaged var hatchEXP: NSNumber?
    @NSManaged var imageName: String?
    @NSManaged var imageNameEgg: String?
    @NSManaged var imageNamef: String?
    @NSManaged var name: String?
    @NSManaged var rarity: String?
    @NSManaged var stage: NSNumber?
    @NSManaged var adopt: NSSet?
    @NSManaged var evolveTo: NSSet?
    @NSManaged var userPets: NSSet?
    @NSManaged var basePet: Pet?

}

宠物

import Foundation
import CoreData


class Pet: NSManagedObject {

    func addEvolveToObject(value:Evolution) {
        let items = mutableSetValueForKey("evolveTo") as NSMutableSet;
        items.addObject(value)
    }

}

进化核心数据类

import Foundation
import CoreData

extension Evolution {

    @NSManaged var evolveValue: String?
    @NSManaged var howEvolve: String?
    @NSManaged var evolveTo: Pet?

}

宠物类可以携带多个进化对象，每个进化对象用于一只宠物

Answer 1

原因是双向关系。当您连接关系的一端时，另一端将为您连接，因此当您向集合添加内容（多端）时，将为您设置另一个属性（一端）。这就是你所看到的。

如果这不是您想要的，那么您需要再添加2个关系，因为您确实希望所有关系都是双向的，但您也希望将您当前拥有的关系分开。

swift - 函数调用后对象更改

1 个答案: