我很难复制/粘贴来处理我的自定义托管对象Person
。该对象包含属性和关系。对象应提供 objectID。我打算实现粘贴生成一个新对象,然后从复制的Person
.
复制 objectID 可能确实有效。我确信粘贴不起作用。我在我的Person
类中实现了以下方法,以尝试复制/粘贴对象:
#pragma mark --- Copy functionality
-(id)pasteboardPropertyListForType:(NSString *)type
{
if ( [type isEqualToString:@"my.company.person"])
{
NSManagedObjectID *oid = self.objectID;
NSURL *uidURL = [oid URIRepresentation];
return [uidURL absoluteString];
}
return nil;
}
-(NSArray *)writableTypesForPasteboard:(NSPasteboard *)pasteboard
{
return @[@"my.company.person"];
}
+ (NSPasteboardWritingOptions)writingOptionsForType:(NSString *)type pasteboard:(NSPasteboard *)pasteboard
{
if ( [type isEqualToString:@"my.company.person"])
{
return NSPasteboardWritingPromised;
}
return nil;
}
并进行粘贴:
#pragma mark --- Paste functionality
+(NSArray *)readableTypesForPasteboard:(NSPasteboard *)pasteboard
{
return @[@"my.company.person"];
}
+ (NSPasteboardReadingOptions)readingOptionsForType:(NSString *)type pasteboard:(NSPasteboard *)pasteboard
{
if ( [type isEqualToString:@"my.company.person"])
{
return NSPasteboardReadingAsString;
}
return nil;
}
- (id)initWithPasteboardPropertyList:(id)propertyList ofType:(NSString *)type
{
if ( [type isEqualToString:@"my.company.person"])
{
...
}
return nil;
}
我应该如何在这里进行?我不知所措,阅读了许多 stackoverflow 问答(例如 Peter Hosey 对NSPasteboard 和简单自定义数据的出色回答)以及 Apple 文档,但我仍然对此感到困惑。