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我正在加载一对多关系(以及将我的应用程序初始加载到核心数据时的一堆其他测试数据)Side是一个与Frames具有一对多关系的Entity:
let sideA = addNewSideToNSManagedObjectContext(orderInFlashcard: 0.0, frames: [frontFrame,backFrame], cardType: newCardType)
let sideB = addNewSideToNSManagedObjectContext(orderInFlashcard: 1.0, frames: [backFrame,frontFrame], cardType: newCardType)
//context is saved after code above
加载初始数据后,我呈现一个 tableViewController,在其中单击一行来呈现加载的数据(基本上我显示闪存卡的 side1.frames,然后显示闪存卡的 side2.frames)当我在初始数据加载后执行此操作时,一切正常并显示正常,side1.frames 有 2 个项目,side2.frames 有 2 个项目,并且它们都正确显示。
问题:当我关闭模拟器并重新运行它时(第一次运行后,数据已经存在并且不再加载),当我点击显示抽认卡时,side1.frames 有 2 个项目,但 side2.frames 是EMTPY,我得到一个空白的显示。我真的很困惑问题是什么,因为所有其他数据都被保留了。
正在根据我显示的当前抽认卡访问存在问题的数据,如下所示:
flashcard.cardType.sides
each side.frame (for subviews)
当我呈现侧面/框架时,以下是检索显示数据的代码:
func setupFramesForSides(){
//var framesForSides:[[Frame]] = [[Frame]]() //property //goal to get array order by side.orderInFlashcard of arrays of frames for each side ordered by order in each side
var sides:[Side] = (flashcard!.cardType!.sides!.allObjects as! [Side])
sides.sort(by:{$0.orderInFlashcard<$1.orderInFlashcard}) //sides sorted by orderInFlashcard
currentSideIndex = 0
print("sides count:\(sides.count)")
for s in 0..<sides.count{
print("side:\(sides[s].orderInFlashcard)")
}
for sideIndex in 0..<sides.count{
let side:Side = sides[sideIndex]
print("currentSideIndex: \(sideIndex)")
print("currentSide: \(side)")
//create sorted array of frames for the side
let frames:[Frame] = side.frames!.allObjects as! [Frame]
print("framesAvailable:\(frames)")
print("framesAvailable.count:\(frames.count)")
//frames.sort(by:{$0<$1})
var frameOrdersInSide:[Int:Frame] = [Int:Frame]()
print("PREPARING NEW SIDE'S FRAMES")
for sideFrame in frames{
for orderInSide in sideFrame.orderInSides!.allObjects as! [FrameOrderInSide]{
if orderInSide.side == side {
print("FOUND MATCHING SIDE IN FRAME.ORDERINSIDES")
print("orderInSide:\(orderInSide.index)")
print("sideFrame:\(sideFrame)")
frameOrdersInSide[Int(orderInSide.index)] = sideFrame //index for frame in this side should never match another frame's index
}
}
}
print("frameOrdersInSide:\(frameOrdersInSide)")
print("frameOrdersInSide.count:\(frameOrdersInSide.count)")
var sortedFramesInSide:[Frame] = [Frame]()
for frameIndexInSide in 0..<(frameOrdersInSide.keys.sorted(by:{$0<$1})).count{
sortedFramesInSide.append(frameOrdersInSide[frameIndexInSide]!) //array of Frames in order of the index in the side
}
framesForSides.append(sortedFramesInSide)
}
以下是在不关闭模拟器的情况下初始加载数据时显示的控制台结果:
sides count:2
side:0.0
side:1.0
currentSideIndex: 0
currentSide: <FlashTags.Side: 0x6000000898d0> (entity: Side; id: 0xd000000000040010 <x-coredata://AABA51C1-C3ED-4701-A7DD-BE1CB7B66995/Side/p1> ; data: {
frames = (
"0xd00000000004000a <x-coredata://AABA51C1-C3ED-4701-A7DD-BE1CB7B66995/Frame/p1>",
"0xd00000000008000a <x-coredata://AABA51C1-C3ED-4701-A7DD-BE1CB7B66995/Frame/p2>"
);
orderInFlashcard = 0;
})
framesAvailable:[<FlashTags.Frame: 0x600000089740> (entity: Frame; id: 0xd00000000004000a <x-coredata://AABA51C1-C3ED-4701-A7DD-BE1CB7B66995/Frame/p1> ; data: {
html = "{{kanjiImage}}";
name = back;
orderInSides = (
"0xd00000000008000c <x-coredata://AABA51C1-C3ED-4701-A7DD-BE1CB7B66995/FrameOrderInSide/p2>",
"0xd00000000004000c <x-coredata://AABA51C1-C3ED-4701-A7DD-BE1CB7B66995/FrameOrderInSide/p1>"
);
}), <FlashTags.Frame: 0x600000089510> (entity: Frame; id: 0xd00000000008000a <x-coredata://AABA51C1-C3ED-4701-A7DD-BE1CB7B66995/Frame/p2> ; data: {
html = "{{englishKeyword}}";
name = front;
orderInSides = (
"0xd00000000010000c <x-coredata://AABA51C1-C3ED-4701-A7DD-BE1CB7B66995/FrameOrderInSide/p4>",
"0xd0000000000c000c <x-coredata://AABA51C1-C3ED-4701-A7DD-BE1CB7B66995/FrameOrderInSide/p3>"
);
})]
framesAvailable.count:2
PREPARING NEW SIDE'S FRAMES
FOUND MATCHING SIDE IN FRAME.ORDERINSIDES
orderInSide:1.0
sideFrame:<FlashTags.Frame: 0x600000089740> (entity: Frame; id: 0xd00000000004000a <x-coredata://AABA51C1-C3ED-4701-A7DD-BE1CB7B66995/Frame/p1> ; data: {
html = "{{kanjiImage}}";
name = back;
orderInSides = (
"0xd00000000008000c <x-coredata://AABA51C1-C3ED-4701-A7DD-BE1CB7B66995/FrameOrderInSide/p2>",
"0xd00000000004000c <x-coredata://AABA51C1-C3ED-4701-A7DD-BE1CB7B66995/FrameOrderInSide/p1>"
);
})
FOUND MATCHING SIDE IN FRAME.ORDERINSIDES
orderInSide:0.0
sideFrame:<FlashTags.Frame: 0x600000089510> (entity: Frame; id: 0xd00000000008000a <x-coredata://AABA51C1-C3ED-4701-A7DD-BE1CB7B66995/Frame/p2> ; data: {
html = "{{englishKeyword}}";
name = front;
orderInSides = (
"0xd00000000010000c <x-coredata://AABA51C1-C3ED-4701-A7DD-BE1CB7B66995/FrameOrderInSide/p4>",
"0xd0000000000c000c <x-coredata://AABA51C1-C3ED-4701-A7DD-BE1CB7B66995/FrameOrderInSide/p3>"
);
})
frameOrdersInSide:[0: <FlashTags.Frame: 0x600000089510> (entity: Frame; id: 0xd00000000008000a <x-coredata://AABA51C1-C3ED-4701-A7DD-BE1CB7B66995/Frame/p2> ; data: {
html = "{{englishKeyword}}";
name = front;
orderInSides = (
"0xd00000000010000c <x-coredata://AABA51C1-C3ED-4701-A7DD-BE1CB7B66995/FrameOrderInSide/p4>",
"0xd0000000000c000c <x-coredata://AABA51C1-C3ED-4701-A7DD-BE1CB7B66995/FrameOrderInSide/p3>"
);
}), 1: <FlashTags.Frame: 0x600000089740> (entity: Frame; id: 0xd00000000004000a <x-coredata://AABA51C1-C3ED-4701-A7DD-BE1CB7B66995/Frame/p1> ; data: {
html = "{{kanjiImage}}";
name = back;
orderInSides = (
"0xd00000000008000c <x-coredata://AABA51C1-C3ED-4701-A7DD-BE1CB7B66995/FrameOrderInSide/p2>",
"0xd00000000004000c <x-coredata://AABA51C1-C3ED-4701-A7DD-BE1CB7B66995/FrameOrderInSide/p1>"
);
})]
frameOrdersInSide.count:2
currentSideIndex: 1
currentSide: <FlashTags.Side: 0x61800008a7d0> (entity: Side; id: 0xd000000000080010 <x-coredata://AABA51C1-C3ED-4701-A7DD-BE1CB7B66995/Side/p2> ; data: {
frames = (
"0xd00000000004000a <x-coredata://AABA51C1-C3ED-4701-A7DD-BE1CB7B66995/Frame/p1>",
"0xd00000000008000a <x-coredata://AABA51C1-C3ED-4701-A7DD-BE1CB7B66995/Frame/p2>"
);
orderInFlashcard = 1;
})
framesAvailable:[<FlashTags.Frame: 0x600000089740> (entity: Frame; id: 0xd00000000004000a <x-coredata://AABA51C1-C3ED-4701-A7DD-BE1CB7B66995/Frame/p1> ; data: {
html = "{{kanjiImage}}";
name = back;
orderInSides = (
"0xd00000000008000c <x-coredata://AABA51C1-C3ED-4701-A7DD-BE1CB7B66995/FrameOrderInSide/p2>",
"0xd00000000004000c <x-coredata://AABA51C1-C3ED-4701-A7DD-BE1CB7B66995/FrameOrderInSide/p1>"
);
}), <FlashTags.Frame: 0x600000089510> (entity: Frame; id: 0xd00000000008000a <x-coredata://AABA51C1-C3ED-4701-A7DD-BE1CB7B66995/Frame/p2> ; data: {
html = "{{englishKeyword}}";
name = front;
orderInSides = (
"0xd00000000010000c <x-coredata://AABA51C1-C3ED-4701-A7DD-BE1CB7B66995/FrameOrderInSide/p4>",
"0xd0000000000c000c <x-coredata://AABA51C1-C3ED-4701-A7DD-BE1CB7B66995/FrameOrderInSide/p3>"
);
})]
framesAvailable.count:2
PREPARING NEW SIDE'S FRAMES
FOUND MATCHING SIDE IN FRAME.ORDERINSIDES
orderInSide:0.0
sideFrame:<FlashTags.Frame: 0x600000089740> (entity: Frame; id: 0xd00000000004000a <x-coredata://AABA51C1-C3ED-4701-A7DD-BE1CB7B66995/Frame/p1> ; data: {
html = "{{kanjiImage}}";
name = back;
orderInSides = (
"0xd00000000008000c <x-coredata://AABA51C1-C3ED-4701-A7DD-BE1CB7B66995/FrameOrderInSide/p2>",
"0xd00000000004000c <x-coredata://AABA51C1-C3ED-4701-A7DD-BE1CB7B66995/FrameOrderInSide/p1>"
);
})
FOUND MATCHING SIDE IN FRAME.ORDERINSIDES
orderInSide:1.0
sideFrame:<FlashTags.Frame: 0x600000089510> (entity: Frame; id: 0xd00000000008000a <x-coredata://AABA51C1-C3ED-4701-A7DD-BE1CB7B66995/Frame/p2> ; data: {
html = "{{englishKeyword}}";
name = front;
orderInSides = (
"0xd00000000010000c <x-coredata://AABA51C1-C3ED-4701-A7DD-BE1CB7B66995/FrameOrderInSide/p4>",
"0xd0000000000c000c <x-coredata://AABA51C1-C3ED-4701-A7DD-BE1CB7B66995/FrameOrderInSide/p3>"
);
})
frameOrdersInSide:[0: <FlashTags.Frame: 0x600000089740> (entity: Frame; id: 0xd00000000004000a <x-coredata://AABA51C1-C3ED-4701-A7DD-BE1CB7B66995/Frame/p1> ; data: {
html = "{{kanjiImage}}";
name = back;
orderInSides = (
"0xd00000000008000c <x-coredata://AABA51C1-C3ED-4701-A7DD-BE1CB7B66995/FrameOrderInSide/p2>",
"0xd00000000004000c <x-coredata://AABA51C1-C3ED-4701-A7DD-BE1CB7B66995/FrameOrderInSide/p1>"
);
}), 1: <FlashTags.Frame: 0x600000089510> (entity: Frame; id: 0xd00000000008000a <x-coredata://AABA51C1-C3ED-4701-A7DD-BE1CB7B66995/Frame/p2> ; data: {
html = "{{englishKeyword}}";
name = front;
orderInSides = (
"0xd00000000010000c <x-coredata://AABA51C1-C3ED-4701-A7DD-BE1CB7B66995/FrameOrderInSide/p4>",
"0xd0000000000c000c <x-coredata://AABA51C1-C3ED-4701-A7DD-BE1CB7B66995/FrameOrderInSide/p3>"
);
})]
frameOrdersInSide.count:2
关闭模拟器后,这是控制台中看到的问题:
sides count:2
side:0.0
side:1.0
currentSideIndex: 0
currentSide: <FlashTags.Side: 0x600000289420> (entity: Side; id: 0xd00000000004000e <x-coredata://AABA51C1-C3ED-4701-A7DD-BE1CB7B66995/Side/p1> ; data: {
frames = "<relationship fault: 0x600000028940 'frames'>";
orderInFlashcard = 0;
})
framesAvailable:[<FlashTags.Frame: 0x600000286810> (entity: Frame; id: 0xd000000000040010 <x-coredata://AABA51C1-C3ED-4701-A7DD-BE1CB7B66995/Frame/p1> ; data: <fault>), <FlashTags.Frame: 0x600000286bd0> (entity: Frame; id: 0xd000000000080010 <x-coredata://AABA51C1-C3ED-4701-A7DD-BE1CB7B66995/Frame/p2> ; data: <fault>)]
framesAvailable.count:2
PREPARING NEW SIDE'S FRAMES
FOUND MATCHING SIDE IN FRAME.ORDERINSIDES
orderInSide:1.0
sideFrame:<FlashTags.Frame: 0x600000286810> (entity: Frame; id: 0xd000000000040010 <x-coredata://AABA51C1-C3ED-4701-A7DD-BE1CB7B66995/Frame/p1> ; data: {
html = "{{kanjiImage}}";
name = back;
orderInSides = (
"0xd000000000080012 <x-coredata://AABA51C1-C3ED-4701-A7DD-BE1CB7B66995/FrameOrderInSide/p2>",
"0xd000000000040012 <x-coredata://AABA51C1-C3ED-4701-A7DD-BE1CB7B66995/FrameOrderInSide/p1>"
);
})
FOUND MATCHING SIDE IN FRAME.ORDERINSIDES
orderInSide:0.0
sideFrame:<FlashTags.Frame: 0x600000286bd0> (entity: Frame; id: 0xd000000000080010 <x-coredata://AABA51C1-C3ED-4701-A7DD-BE1CB7B66995/Frame/p2> ; data: {
html = "{{englishKeyword}}";
name = front;
orderInSides = (
"0xd0000000000c0012 <x-coredata://AABA51C1-C3ED-4701-A7DD-BE1CB7B66995/FrameOrderInSide/p3>",
"0xd000000000100012 <x-coredata://AABA51C1-C3ED-4701-A7DD-BE1CB7B66995/FrameOrderInSide/p4>"
);
})
frameOrdersInSide:[0: <FlashTags.Frame: 0x600000286bd0> (entity: Frame; id: 0xd000000000080010 <x-coredata://AABA51C1-C3ED-4701-A7DD-BE1CB7B66995/Frame/p2> ; data: {
html = "{{englishKeyword}}";
name = front;
orderInSides = (
"0xd0000000000c0012 <x-coredata://AABA51C1-C3ED-4701-A7DD-BE1CB7B66995/FrameOrderInSide/p3>",
"0xd000000000100012 <x-coredata://AABA51C1-C3ED-4701-A7DD-BE1CB7B66995/FrameOrderInSide/p4>"
);
}), 1: <FlashTags.Frame: 0x600000286810> (entity: Frame; id: 0xd000000000040010 <x-coredata://AABA51C1-C3ED-4701-A7DD-BE1CB7B66995/Frame/p1> ; data: {
html = "{{kanjiImage}}";
name = back;
orderInSides = (
"0xd000000000080012 <x-coredata://AABA51C1-C3ED-4701-A7DD-BE1CB7B66995/FrameOrderInSide/p2>",
"0xd000000000040012 <x-coredata://AABA51C1-C3ED-4701-A7DD-BE1CB7B66995/FrameOrderInSide/p1>"
);
})]
frameOrdersInSide.count:2
currentSideIndex: 1
currentSide: <FlashTags.Side: 0x6000002894c0> (entity: Side; id: 0xd00000000008000e <x-coredata://AABA51C1-C3ED-4701-A7DD-BE1CB7B66995/Side/p2> ; data: {
frames = "<relationship fault: 0x600000029b00 'frames'>";
orderInFlashcard = 1;
})
framesAvailable:[]
framesAvailable.count:0
PREPARING NEW SIDE'S FRAMES
frameOrdersInSide:[:]
frameOrdersInSide.count:0
最佳答案
这是更改我的核心数据设计后更新的抽认卡加载代码:
var sides:[Side] = (flashcard!.cardType!.sides!.allObjects as! [Side])
sides.sort(by:{$0.orderInFlashcard<$1.orderInFlashcard}) //sides sorted by orderInFlashcard
currentSideIndex = 0
for sideIndex in 0..<sides.count{
let side:Side = sides[sideIndex]
let framesOrderInSide:[FrameOrderInSide] = (side.frameOrders!.allObjects as! [FrameOrderInSide]).sorted(by:{$0.index<$1.index})
framesForSides.append(framesOrderInSide.map({$0.frame}))
}
关于ios - 在核心数据中保存一对多关系,但关闭模拟器后关系中只有一项。控制台 Swift 中的错误,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/46394776/
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