Code
2023-12-30 06:00:04

在NSOrderedSet生成的访问器中引发的异常

在我的Lion应用中，我有这样的数据模型:

Item内的关系子项是有序的。

Xcode 4.1 (build 4B110)为我创建了文件Item.h, Item.h。m, SubItem.h和SubItem.h。

下面是Item.h的内容(自动生成):

#import <Foundation/Foundation.h>

#import <CoreData/CoreData.h>

@class SubItem;

@interface Item : NSManagedObject {
@private
}

@property (nonatomic, retain) NSString * name;
@property (nonatomic, retain) NSOrderedSet *subitems;
@end

@interface Item (CoreDataGeneratedAccessors)

- (void)insertObject:(SubItem *)value inSubitemsAtIndex:(NSUInteger)idx;
- (void)removeObjectFromSubitemsAtIndex:(NSUInteger)idx;
- (void)insertSubitems:(NSArray *)value atIndexes:(NSIndexSet *)indexes;
- (void)removeSubitemsAtIndexes:(NSIndexSet *)indexes;
- (void)replaceObjectInSubitemsAtIndex:(NSUInteger)idx withObject:(SubItem *)value;
- (void)replaceSubitemsAtIndexes:(NSIndexSet *)indexes withSubitems:(NSArray *)values;
- (void)addSubitemsObject:(SubItem *)value;
- (void)removeSubitemsObject:(SubItem *)value;
- (void)addSubitems:(NSOrderedSet *)values;
- (void)removeSubitems:(NSOrderedSet *)values;

@end

下面是Item.m的内容(自动生成):

#import "Item.h"
#import "SubItem.h"

@implementation Item

@dynamic name;
@dynamic subitems;

@end

如您所见，Item类提供了一个名为addSubitemsObject:的方法。不幸的是，当你试图以这种方式使用它时:

Item *item = [NSEntityDescription insertNewObjectForEntityForName:@"Item" inManagedObjectContext:self.managedObjectContext];
item.name = @"FirstItem";

SubItem *subItem = [NSEntityDescription insertNewObjectForEntityForName:@"SubItem" inManagedObjectContext:self.managedObjectContext];

[item addSubitemsObject:subItem];

出现以下错误:

2011-09-12 10:28:45.236 Test[2002:707] *** -[NSSet intersectsSet:]: set argument is not an NSSet

你能帮我吗?

更新:

在我的错误报告刚刚过去1787天之后，今天(2016年8月1日)，苹果公司给我写了这样的话:“请用最新的iOS 10测试版验证这个问题，并在bugreport.apple.com上更新你的错误报告。”让我们希望这是正确的时间:)

当前回答

相反，我建议使用NSObject中的访问器来访问关系的NSMutableOrderedSet。

- (void)addSubitemsObject:(SubItem *)value {
      NSMutableOrderedSet* tempSet = [self mutableOrderedSetValueForKey:@"subitems"];
      [tempSet addObject:value];
 }

例如，iOS v5.0的核心数据发布说明参考了这一点。

在一个简短的测试中，它在我的应用程序中工作。

2012-01-26 07:18:08

其他回答

我用您的数据模型和我自己的一个不同的名称复制了您的设置。两种情况下都有相同的错误。

看起来像是苹果自动生成代码中的bug。

2011-09-13 00:24:17

我决定通过实现所有必需的方法来改进解决方案:

static NSString *const kItemsKey = @"<#property#>";

- (void)insertObject:(<#Type#> *)value in<#Property#>AtIndex:(NSUInteger)idx {
    NSIndexSet* indexes = [NSIndexSet indexSetWithIndex:idx];
    [self willChange:NSKeyValueChangeInsertion valuesAtIndexes:indexes forKey:kItemsKey];
    NSMutableOrderedSet *tmpOrderedSet = [NSMutableOrderedSet orderedSetWithOrderedSet:[self mutableOrderedSetValueForKey:kItemsKey]];
    [tmpOrderedSet insertObject:value atIndex:idx];
    [self setPrimitiveValue:tmpOrderedSet forKey:kItemsKey];
    [self didChange:NSKeyValueChangeInsertion valuesAtIndexes:indexes forKey:kItemsKey];
}

- (void)removeObjectFrom<#Property#>AtIndex:(NSUInteger)idx {
    NSIndexSet* indexes = [NSIndexSet indexSetWithIndex:idx];
    [self willChange:NSKeyValueChangeRemoval valuesAtIndexes:indexes forKey:kItemsKey];
    NSMutableOrderedSet *tmpOrderedSet = [NSMutableOrderedSet orderedSetWithOrderedSet:[self mutableOrderedSetValueForKey:kItemsKey]];
    [tmpOrderedSet removeObjectAtIndex:idx];
    [self setPrimitiveValue:tmpOrderedSet forKey:kItemsKey];
    [self didChange:NSKeyValueChangeRemoval valuesAtIndexes:indexes forKey:kItemsKey];
}

- (void)insert<#Property#>:(NSArray *)values atIndexes:(NSIndexSet *)indexes {
    [self willChange:NSKeyValueChangeInsertion valuesAtIndexes:indexes forKey:kItemsKey];
    NSMutableOrderedSet *tmpOrderedSet = [NSMutableOrderedSet orderedSetWithOrderedSet:[self mutableOrderedSetValueForKey:kItemsKey]];
    [tmpOrderedSet insertObjects:values atIndexes:indexes];
    [self setPrimitiveValue:tmpOrderedSet forKey:kItemsKey];
    [self didChange:NSKeyValueChangeInsertion valuesAtIndexes:indexes forKey:kItemsKey];
}

- (void)remove<#Property#>AtIndexes:(NSIndexSet *)indexes {
    [self willChange:NSKeyValueChangeRemoval valuesAtIndexes:indexes forKey:kItemsKey];
    NSMutableOrderedSet *tmpOrderedSet = [NSMutableOrderedSet orderedSetWithOrderedSet:[self mutableOrderedSetValueForKey:kItemsKey]];
    [tmpOrderedSet removeObjectsAtIndexes:indexes];
    [self setPrimitiveValue:tmpOrderedSet forKey:kItemsKey];
    [self didChange:NSKeyValueChangeRemoval valuesAtIndexes:indexes forKey:kItemsKey];
}

- (void)replaceObjectIn<#Property#>AtIndex:(NSUInteger)idx withObject:(<#Type#> *)value {
    NSIndexSet* indexes = [NSIndexSet indexSetWithIndex:idx];
    [self willChange:NSKeyValueChangeReplacement valuesAtIndexes:indexes forKey:kItemsKey];
    NSMutableOrderedSet *tmpOrderedSet = [NSMutableOrderedSet orderedSetWithOrderedSet:[self mutableOrderedSetValueForKey:kItemsKey]];
    [tmpOrderedSet replaceObjectAtIndex:idx withObject:value];
    [self setPrimitiveValue:tmpOrderedSet forKey:kItemsKey];
    [self didChange:NSKeyValueChangeReplacement valuesAtIndexes:indexes forKey:kItemsKey];
}

- (void)replace<#Property#>AtIndexes:(NSIndexSet *)indexes with<#Property#>:(NSArray *)values {
    [self willChange:NSKeyValueChangeReplacement valuesAtIndexes:indexes forKey:kItemsKey];
    NSMutableOrderedSet *tmpOrderedSet = [NSMutableOrderedSet orderedSetWithOrderedSet:[self mutableOrderedSetValueForKey:kItemsKey]];
    [tmpOrderedSet replaceObjectsAtIndexes:indexes withObjects:values];
    [self setPrimitiveValue:tmpOrderedSet forKey:kItemsKey];
    [self didChange:NSKeyValueChangeReplacement valuesAtIndexes:indexes forKey:kItemsKey];
}

- (void)add<#Property#>Object:(<#Type#> *)value {
    NSMutableOrderedSet *tmpOrderedSet = [NSMutableOrderedSet orderedSetWithOrderedSet:[self mutableOrderedSetValueForKey:kItemsKey]];
    NSUInteger idx = [tmpOrderedSet count];
    NSIndexSet* indexes = [NSIndexSet indexSetWithIndex:idx];
    [self willChange:NSKeyValueChangeInsertion valuesAtIndexes:indexes forKey:kItemsKey];
    [tmpOrderedSet addObject:value];
    [self setPrimitiveValue:tmpOrderedSet forKey:kItemsKey];
    [self didChange:NSKeyValueChangeInsertion valuesAtIndexes:indexes forKey:kItemsKey];
}

- (void)remove<#Property#>Object:(<#Type#> *)value {
    NSMutableOrderedSet *tmpOrderedSet = [NSMutableOrderedSet orderedSetWithOrderedSet:[self mutableOrderedSetValueForKey:kItemsKey]];
    NSUInteger idx = [tmpOrderedSet indexOfObject:value];
    if (idx != NSNotFound) {
        NSIndexSet* indexes = [NSIndexSet indexSetWithIndex:idx];
        [self willChange:NSKeyValueChangeRemoval valuesAtIndexes:indexes forKey:kItemsKey];
        [tmpOrderedSet removeObject:value];
        [self setPrimitiveValue:tmpOrderedSet forKey:kItemsKey];
        [self didChange:NSKeyValueChangeRemoval valuesAtIndexes:indexes forKey:kItemsKey];
    }
}

- (void)add<#Property#>:(NSOrderedSet *)values {
    NSMutableOrderedSet *tmpOrderedSet = [NSMutableOrderedSet orderedSetWithOrderedSet:[self mutableOrderedSetValueForKey:kItemsKey]];
    NSMutableIndexSet *indexes = [NSMutableIndexSet indexSet];
    NSUInteger valuesCount = [values count];
    NSUInteger objectsCount = [tmpOrderedSet count];
    for (NSUInteger i = 0; i < valuesCount; ++i) {
        [indexes addIndex:(objectsCount + i)];
    }
    if (valuesCount > 0) {
        [self willChange:NSKeyValueChangeInsertion valuesAtIndexes:indexes forKey:kItemsKey];
        [tmpOrderedSet addObjectsFromArray:[values array]];
        [self setPrimitiveValue:tmpOrderedSet forKey:kItemsKey];
        [self didChange:NSKeyValueChangeInsertion valuesAtIndexes:indexes forKey:kItemsKey];
    }
}

- (void)remove<#Property#>:(NSOrderedSet *)values {
    NSMutableOrderedSet *tmpOrderedSet = [NSMutableOrderedSet orderedSetWithOrderedSet:[self mutableOrderedSetValueForKey:kItemsKey]];
    NSMutableIndexSet *indexes = [NSMutableIndexSet indexSet];
    for (id value in values) {
        NSUInteger idx = [tmpOrderedSet indexOfObject:value];
        if (idx != NSNotFound) {
            [indexes addIndex:idx];
        }
    }
    if ([indexes count] > 0) {
        [self willChange:NSKeyValueChangeRemoval valuesAtIndexes:indexes forKey:kItemsKey];
        [tmpOrderedSet removeObjectsAtIndexes:indexes];
        [self setPrimitiveValue:tmpOrderedSet forKey:kItemsKey];
        [self didChange:NSKeyValueChangeRemoval valuesAtIndexes:indexes forKey:kItemsKey];
    }
}
2012-03-04 16:42:25

我在用XCode 7将一个项目从Objective-C迁移到Swift 2时遇到了这个问题。这个项目过去是有效的，而且有一个很好的理由:我使用MOGenerator，它有替换方法来修复这个错误。但并不是所有的方法都需要替换。

这里有一个完整的解决方案和一个示例类，尽可能地依赖默认访问器。

假设我们有一个包含有序项的List

首先，如果你有一对多的关系，最简单的方法就是:

item.list = list

而不是

list.addItemsObject(item)

现在，如果这不是一个选择，以下是你可以做的:

// Extension created from your DataModel by selecting it and
// clicking on "Editor > Create NSManagedObject subclass…"

extension List {
  @NSManaged var items: NSOrderedSet?
}

class List

  // Those two methods work out of the box for free, relying on
  // Core Data's KVC accessors, you just have to declare them
  // See release note 17583057 https://developer.apple.com/library/prerelease/tvos/releasenotes/DeveloperTools/RN-Xcode/Chapters/xc7_release_notes.html
  @NSManaged func removeItemsObject(item: Item)
  @NSManaged func removeItems(items: NSOrderedSet)

  // The following two methods usually work too, but not for NSOrderedSet
  // @NSManaged func addItemsObject(item: Item)
  // @NSManaged func addItems(items: NSOrderedSet)

  // So we'll replace them with theses

  // A mutable computed property
  var itemsSet: NSMutableOrderedSet {
    willAccessValueForKey("items")
    let result = mutableOrderedSetValueForKey("items")
    didAccessValueForKey("items")
    return result
  }

  func addItemsObject(value: Item) {
    itemsSet.addObject(value)
  }

  func addItems(value: NSOrderedSet) {
    itemsSet.unionOrderedSet(value)
  }
end

当然，如果你使用的是Objective-C，你可以做完全相同的事情，因为这是我最初得到的想法:)

2015-11-11 10:31:46

我刚刚在Swift (Xcode 6.1.1)中遇到了问题。

答案是不要在NSManagedObject子类中编写任何方法或其他东西。我认为这是一个编译器错误。非常奇怪的虫子。

希望能有所帮助。

2014-12-05 01:35:47

我找到了一个对我有用的修复程序。我只是替换了这个:

[item addSubitemsObject:subItem];

用这个:

item.subitemsObject = subItem;
2013-05-13 13:34:52

推荐文章

aliyun

最新文章

标签

2025 code 京ICP备15047053号-1