本のチュートリアルを使用すると、他の3つの永続化メソッドが問題なく機能しました。シミュレーターの実行時にこのメッセージが表示される:
2012-06-01 23:50:52.555コアデータの永続性[9022:fb03]未解決のエラーエラードメイン=NSCocoaErrorDomainコード=134100 "操作を完了できませんでした。(Cocoaエラー134100)" UserInfo = 0x6b92af0 {metadata = { type = immutable dict、count = 7、entries => 2:{contents = "NSStoreModelVersionIdentifiers"} = {type = immutable、count = 1、values =(0:{contents = ""})} 4:{contents = " NSPersistenceFrameworkVersion "} = {value = +386、type = kCFNumberSInt64Type} 6:{contents =" NSStoreModelVersionHashes "} = {type = immutable dict、count = 1、entries => 1:{contents =" Line "} = {length = 32、容量= 32、バイト= 0x03913bef8e6d277b9119a99fbc7b4adc ... 39db5d5f94ed5507}} 7:{contents = "NSStoreUUID"} = {contents = "FE367DDA-4009-4CD1-9B8A-D62943668E8E "} 8:{contents =" NSStoreType "} = {contents =" SQLite "} 9:{contents =" _NSAutoVacuumLevel "} = {contents =" 2 "} 10:{contents = "NSStoreModelVersionHashesVersion"} = {value = +3、type = kCFNumberSInt32Type}}、reason =ストアを開くために使用されるモデルは、ストアの作成に使用されるモデルと互換性がありません}、{metadata = {NSPersistenceFrameworkVersion = 386; NSStoreModelVersionHashes = {Line = <03913bef 8e6d277b 9119a99f bc7b4adc 4fec730a 73b61247 39db5d5f 94ed5507>;}; NSStoreModelVersionHashesVersion = 3; NSStoreModelVersionIdentifiers =( ""); NSStoreType = SQLite; NSStoreUUID = "FE367DDA-4009-4CD1-9B8A-D62943668E8E ";" _NSAutoVacuumLevel "= 2;}; reason ="ストアのオープンに使用されたモデルは、ストアの作成に使用されたモデルと互換性がありません ";}
両方のエンティティが正しく設定されています。ファイルは次のとおりです。
#import "BIDViewController.h"
#import "BIDAppDelegate.h"
@interface BIDViewController ()
@end
@implementation BIDViewController
@synthesize line1;
@synthesize line2;
@synthesize line3;
@synthesize line4;
- (id)initWithNibName:(NSString *)nibNameOrNil bundle:(NSBundle *)nibBundleOrNil
{
self = [super initWithNibName:nibNameOrNil bundle:nibBundleOrNil];
if (self) {
// Custom initialization
}
return self;
}
- (void)viewDidLoad
{
[super viewDidLoad];
// Do any additional setup after loading the view from its nib.
BIDAppDelegate *appDelegate =
[[UIApplication sharedApplication] delegate];
NSManagedObjectContext *context = [appDelegate managedObjectContext];
NSEntityDescription *entityDescription = [NSEntityDescription
entityForName:@"Line"
inManagedObjectContext:context];
NSFetchRequest *request = [[NSFetchRequest alloc] init];
[request setEntity:entityDescription];
NSError *error;
NSArray *objects = [context executeFetchRequest:request error:&error];
if (objects == nil) {
NSLog(@"There was an error!");
// Do whatever error handling is appropriate
}
for (NSManagedObject *oneObject in objects) {
NSNumber *lineNum = [oneObject valueForKey:@"lineNum"];
NSString *lineText = [oneObject valueForKey:@"lineText"];
NSString *fieldName = [NSString
stringWithFormat:@"line%d", [lineNum integerValue]];
UITextField *theField = [self valueForKey:fieldName];
theField.text = lineText;
}
UIApplication *app = [UIApplication sharedApplication];
[[NSNotificationCenter defaultCenter] addObserver:self
selector:@selector(applicationWillResignActive:)
name:UIApplicationWillResignActiveNotification
object:app];
}
- (void)viewDidUnload
{
[super viewDidUnload];
// Release any retained subviews of the main view.
// e.g. self.myOutlet = nil;
self.line1 = nil;
self.line2 = nil;
self.line3 = nil;
self.line4 = nil;
}
- (BOOL)shouldAutorotateToInterfaceOrientation:(UIInterfaceOrientation)interfaceOrientation
{
return (interfaceOrientation == UIInterfaceOrientationPortrait);
}
-(void)applicationWillResignActive:(NSNotification *) notification {
BIDAppDelegate *appDelegate = [[UIApplication sharedApplication] delegate];
NSManagedObjectContext *context = [appDelegate managedObjectContext];
NSError *error;
for (int i = 1; i <=4; i++) {
NSString *fieldName = [NSString stringWithFormat:@"line%d", i];
UITextField *theField = [self valueForKey:fieldName];
NSFetchRequest *request = [[NSFetchRequest alloc] init];
NSEntityDescription *entityDescription = [NSEntityDescription
entityForName:@"Line"
inManagedObjectContext:context];
[request setEntity:entityDescription];
NSPredicate *pred = [NSPredicate
predicateWithFormat:@"(lineNum = %d)", i];
[request setPredicate:pred];
NSManagedObject *theLine = nil;
NSArray *objects = [context executeFetchRequest:request
error:&error];
if (objects == nil) {
NSLog(@"There was an error!");
// Do whatever error handling is appropriate
}
if ([objects count] > 0)
theLine = [objects objectAtIndex:0];
else
theLine = [NSEntityDescription
insertNewObjectForEntityForName:@"Line"
inManagedObjectContext:context];
[theLine setValue:[NSNumber numberWithInt:i] forKey:@"lineNum"];
[theLine setValue:theField.text forKey:@"lineText"];
}
[context save:&error];
}
@end
どんな考えや意見も大歓迎です!