#dynamic how to set properties? - core-data

Question

H file:
#interface TaskTypeEntity : NSManagedObject
#property (nonatomic, retain) UIColor *color;
#property (nonatomic, retain) UIImage *image;
#property (nonatomic, retain) NSString * name;
#property (nonatomic, retain) NSNumber * status;
#property (nonatomic, retain) NSSet *task;
#property (nonatomic, retain) NSSet *taskCount;
#end
M file:
#implementation TaskTypeEntity
#dynamic color;
#dynamic image;
#dynamic name;
#dynamic status;
#dynamic task;
#dynamic taskCount;
- (void) add:(TaskTypeEntity*)data
{
TaskTypeEntity *taskTypeEntity = [NSEntityDescription insertNewObjectForEntityForName:ENTITY_NAME inManagedObjectContext:content];
taskTypeEntity.name = data.name;
taskTypeEntity.image = data.image;
taskTypeEntity.color = data.color;
BOOL result = [content save:nil];
if (result) {
NSLog(#"success%#", data);
}else{
NSLog(#"fail");
}
}
#end
When setting the property， It doesn't work:
TaskTypeEntity *taskTypeEntity = [TaskTypeEntity alloc];
taskTypeEntity.name = #"dfdfd";
[taskTypeModel add:taskTypeEntity];
error：
* Terminating app due to uncaught exception 'NSInvalidArgumentException', reason: '-[TaskTypeEntity setName:]: unrecognized selector sent to instance 0x8a7b070'
Please help me, thank you

Answer 1

According to the NSManagedObject class reference:
Important: This method is the designated initializer for
NSManagedObject. You must not initialize a managed object simply by
sending it init.
The method of reference in the above quoted text is insertNewObjectForEntityForName:inManagedObjectContext: and can be used thusly:
NSManagedObject *object = [NSEntityDescription
insertNewObjectForEntityForName:#"Item"
inManagedObjectContext:context];
EDIT (In response...)
This code is just plain wrong:
TaskTypeEntity *taskTypeEntity = [TaskTypeEntity alloc];
Even if TaskTypeEntity were not a NSManagedObject it would still be wrong, as you never called an initializer.
The fact that it is a NSManagedObject makes it even more wrong, because you are never supposed to alloc/init one of those.
Why not try something like this (I assume you are using transformable attributes for image and color):
+ (instancetype)taskTypeEntityInMOC:(NSManagedObjectContext*)context
name:(NSString*)name
image:(UIImage*)image
color:(UIColor*)color
{
TaskTypeEntity *taskTypeEntity = [NSEntityDescription insertNewObjectForEntityForName:ENTITY_NAME inManagedObjectContext:content];
taskTypeEntity.name = name;
taskTypeEntity.image = image;
taskTypeEntity.color = color;
return taskTypeEntity;
}
Then you can call it...
TaskTypeEntity *taskTypeEntity =
[TaskTypeEntity taskTypeEntityInMOC:context
name:(NSString*)name
image:(UIImage*)image
color:(UIColor*)color];