我正在尝试将数据保存在CoreData中并且出错 .
NSInvalidArgumentException', reason: '+entityForName: nil is not a legal NSManagedObjectContext parameter searching for entity name 'File''
这是代码:
-(NSMutableArray *)listFileAtPath:(NSString *)path
{
NSMutableArray *directoryContent = [[NSFileManager defaultManager] contentsOfDirectoryAtPath:path error:NULL];
return directoryContent;
}
-(void)FileData
{
NSArray *paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);
NSString *documentsDirectory = [paths objectAtIndex:0];
File *myMO = (File*) [NSEntityDescription insertNewObjectForEntityForName:@"File" inManagedObjectContext:[self managedObjectContext]];
[myMO setValue:[self listFileAtPath:documentsDirectory] forKey:@"filename"];
}
他为什么不看我的实体?
1 回答
[self managedObjectContext]
根据错误消息返回nil
,查看此方法以验证它是否正在返回NSMangedObjectContext