objective-c - 删除对象时 CoreData 的奇怪行为

Question

我尝试构建简单的贝塞尔曲线编辑器。型号和代码如下。当我尝试删除node.bcpInData或node.bcpOutData时，仅node.originData被删除，女巫根本没有任何意义。

这是我的模型:

这是删除:方法:

-(void) delete:(id)sender {

    [undoManager beginUndoGrouping];
    [points willChangeValueForKey:@"arrangedObjects"];

    NSMutableArray * nodesToDelete = [NSMutableArray array];
    for (TPPointData * pointData in points.selectedObjects) {


        NSLog(@"PointData %@", pointData);
        NSLog(@"PointData.node = %@", pointData.node);
        TPNode * node = pointData.node;

        if (pointData == pointData.node.originData) {
            //delete everything
            [nodesToDelete addObject:pointData.node];
            if (pointData.node.bcpInData!=nil)   {
                NSLog(@"deleting bcpInData: %@", pointData.node.bcpInData);
                [moc deleteObject:pointData.node.bcpInData];
                pointData.node = nil;
            }
            if (pointData.node.bcpOutData!=nil) {
                NSLog(@"deleting bcpOutData: %@", pointData.node.bcpOutData);
                [moc deleteObject:pointData.node.bcpOutData];
                pointData.node = nil;

            }
            NSLog(@"deleting originData: %@", pointData.node.bcpOutData);
            [moc deleteObject:pointData];
            pointData.node = nil;

        } else { //delete just object

            [moc deleteObject:pointData];
            pointData.node = nil;
        }
        NSLog(@"node: %@", node);   
    }


    NSMutableArray * contoursToDelete = [NSMutableArray array];
    for (TPNode * node in nodesToDelete) {

        if (node.contour.nodes.count == 1) {
            [contoursToDelete addObject:node.contour];
        }
        [moc deleteObject:node];
    }

    for (TPContour * contour in contoursToDelete) {
        [moc deleteObject:contour];
    }
    [points didChangeValueForKey:@"arrangedObjects"];
    [undoManager endUndoGrouping];
}

尝试删除来源后的列表:

2013-02-03 12:11:34.849 AlwaysSmooth[42786:403] PointData <TPPointData: 0x105c06400> (entity: PointData; id: 0x100133810 <x-coredata://8E705B64-CB39-4FBD-B296-936E70835DC8/PointData/p327> ; data: {
    node = "0x100133830 <x-coredata://8E705B64-CB39-4FBD-B296-936E70835DC8/Node/p328>";
    x = "215.5";
    y = "550.1667";
})
2013-02-03 12:11:34.850 AlwaysSmooth[42786:403] PointData.node = <TPNode: 0x105c13250> (entity: Node; id: 0x100133830 <x-coredata://8E705B64-CB39-4FBD-B296-936E70835DC8/Node/p328> ; data: {
    attribute = nil;
    bcpIn = "(...not nil..)";
    bcpInData = "0x1001337b0 <x-coredata://8E705B64-CB39-4FBD-B296-936E70835DC8/PointData/p326>";
    bcpOut = "(...not nil..)";
    bcpOutData = "0x100133640 <x-coredata://8E705B64-CB39-4FBD-B296-936E70835DC8/PointData/p329>";
    contour = "0x1001c8c20 <x-coredata://8E705B64-CB39-4FBD-B296-936E70835DC8/Contour/p282>";
    next = "(...not nil..)";
    originData = "0x100133810 <x-coredata://8E705B64-CB39-4FBD-B296-936E70835DC8/PointData/p327>";
    prev = "(...not nil..)";
    smooth = 1;
    type = 2;
})
2013-02-03 12:11:34.851 AlwaysSmooth[42786:403] deleting bcpInData: <TPPointData: 0x100183d70> (entity: PointData; id: 0x1001337b0 <x-coredata://8E705B64-CB39-4FBD-B296-936E70835DC8/PointData/p326> ; data: {
    node = "0x100133830 <x-coredata://8E705B64-CB39-4FBD-B296-936E70835DC8/Node/p328>";
    x = "301.4023";
    y = "544.7839";
})
2013-02-03 12:11:34.853 AlwaysSmooth[42786:403] deleting originData: (null)
2013-02-03 12:11:34.854 AlwaysSmooth[42786:403] node: <TPNode: 0x105c13250> (entity: Node; id: 0x100133830 <x-coredata://8E705B64-CB39-4FBD-B296-936E70835DC8/Node/p328> ; data: {
    attribute = nil;
    bcpIn = "(...not nil..)";
    bcpInData = "0x1001337b0 <x-coredata://8E705B64-CB39-4FBD-B296-936E70835DC8/PointData/p326>";
    bcpOut = "(...not nil..)";
    bcpOutData = "0x100133640 <x-coredata://8E705B64-CB39-4FBD-B296-936E70835DC8/PointData/p329>";
    contour = "0x1001c8c20 <x-coredata://8E705B64-CB39-4FBD-B296-936E70835DC8/Contour/p282>";
    next = "(...not nil..)";
    originData = nil;
    prev = "(...not nil..)";
    smooth = 1;
    type = 2;
})

为什么它甚至不尝试删除bcpOutData？ originData 删除前为空。删除后，bcpInData 和 bcpOutData 仍然存在于节点对象中。撤消仍然是可能的。

当我尝试仅删除 bcpInData 或 bcpOutData 时，代码再次仅删除 originData:

2013-02-03 12:29:13.526 AlwaysSmooth[42786:403] PointData <TPPointData: 0x100183d70> (entity: PointData; id: 0x1001337b0 <x-coredata://8E705B64-CB39-4FBD-B296-936E70835DC8/PointData/p326> ; data: {
    node = "0x100133830 <x-coredata://8E705B64-CB39-4FBD-B296-936E70835DC8/Node/p328>";
    x = "301.4023";
    y = "544.7839";
})
2013-02-03 12:29:13.527 AlwaysSmooth[42786:403] PointData.node = <TPNode: 0x105c13250> (entity: Node; id: 0x100133830 <x-coredata://8E705B64-CB39-4FBD-B296-936E70835DC8/Node/p328> ; data: {
    attribute = nil;
    bcpIn = "(...not nil..)";
    bcpInData = "0x1001337b0 <x-coredata://8E705B64-CB39-4FBD-B296-936E70835DC8/PointData/p326>";
    bcpOut = "(...not nil..)";
    bcpOutData = "0x100133640 <x-coredata://8E705B64-CB39-4FBD-B296-936E70835DC8/PointData/p329>";
    contour = "0x1001c8c20 <x-coredata://8E705B64-CB39-4FBD-B296-936E70835DC8/Contour/p282>";
    next = "(...not nil..)";
    originData = "0x100133810 <x-coredata://8E705B64-CB39-4FBD-B296-936E70835DC8/PointData/p327>";
    prev = "(...not nil..)";
    smooth = 1;
    type = 2;
})
2013-02-03 12:29:13.529 AlwaysSmooth[42786:403] node: <TPNode: 0x105c13250> (entity: Node; id: 0x100133830 <x-coredata://8E705B64-CB39-4FBD-B296-936E70835DC8/Node/p328> ; data: {
    attribute = nil;
    bcpIn = "(...not nil..)";
    bcpInData = "0x1001337b0 <x-coredata://8E705B64-CB39-4FBD-B296-936E70835DC8/PointData/p326>";
    bcpOut = "(...not nil..)";
    bcpOutData = "0x100133640 <x-coredata://8E705B64-CB39-4FBD-B296-936E70835DC8/PointData/p329>";
    contour = "0x1001c8c20 <x-coredata://8E705B64-CB39-4FBD-B296-936E70835DC8/Contour/p282>";
    next = "(...not nil..)";
    originData = nil;
    prev = "(...not nil..)";
    smooth = 1;
    type = 2;
})

有什么帮助吗？

Answer 1

在点 Controller 中选择了 BcpInData 和 BcpOutData。这已经足够了[points removeSelectedObjects:@[pointData]]; 删除之前。