Core data 获取核心数据在模拟器中工作,但不在设备上工作
我有一个应用程序,其中我展示VC1来选择游戏,VC2来提交所选游戏的游戏。当用户从VC2切换回VC1时,我希望保留他们正在玩的游戏的游戏数据。因为它是iOS 6.0,所以我使用UIManagedDocument访问核心数据以存储和检索游戏数据。我完全被我所面临的问题难住了,在花了无数个小时之后,我在这个论坛上向智者们伸出了援助之手 当我在模拟器中运行下面的代码时,一切正常,数据被存储,如果用户选择与前面相同的游戏,我也能够检索并显示它。不幸的是,在设备上,我可以看到数据存储在segue上-我放置了一个断点,并使用iExplorer查看了persistentStore-但当我回到VC2选择存储的游戏时,persistentStore似乎被覆盖或清除了所有数据。在调试器中,我注意到在设备上执行检索时,“UIManagedDocument”的_persistentStoreCoordinator对象的_PersistentStoresNSArray属性始终显示0 非常感谢您的帮助Core data 获取核心数据在模拟器中工作,但不在设备上工作,core-data,ios6,nsfetchrequest,persistent-storage,uimanageddocument,Core Data,Ios6,Nsfetchrequest,Persistent Storage,Uimanageddocument,我有一个应用程序,其中我展示VC1来选择游戏,VC2来提交所选游戏的游戏。当用户从VC2切换回VC1时,我希望保留他们正在玩的游戏的游戏数据。因为它是iOS 6.0,所以我使用UIManagedDocument访问核心数据以存储和检索游戏数据。我完全被我所面临的问题难住了,在花了无数个小时之后,我在这个论坛上向智者们伸出了援助之手 当我在模拟器中运行下面的代码时,一切正常,数据被存储,如果用户选择与前面相同的游戏,我也能够检索并显示它。不幸的是,在设备上,我可以看到数据存储在segue上-我放置
- (void) addOrGetDataToGamesDatabase:(CNPUIManagedDocument *)document withFlag:(BOOL)getFlag {
if (getFlag) {
NSLog(@"INSIDE addDataToGamesDatabase to get data");
}
else
NSLog(@"INSIDE addDataToGamesDatabase to set data");
dispatch_queue_t update = dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_HIGH,0);
dispatch_sync(update, ^{
[document.managedObjectContext performBlockAndWait:^{
NSFetchRequest *request = [NSFetchRequest fetchRequestWithEntityName:@"Game"];
request.predicate = [NSPredicate predicateWithFormat:@"game = %@", self.selectedGameID];
NSError *error = nil;
NSLog(@"Persistent Store Name = %@", [[document class] persistentStoreName]);
NSArray *matches = [document.managedObjectContext executeFetchRequest:request error:&error];
NSLog(@"Fetch Error if any: %@ %@", error.debugDescription, [error userInfo]);
if (!matches || matches.count >1) {
NSLog(@"There is a problem with creating the game data");
}
//This is where it fails on the device as the match.count is always 0 as the fetch retrieves nothing
else if ([matches count] == 0) {
if (!getFlag) {
// Code to initialize the game data in store
}
}
else if ([matches count] == 1) {
// Another fetch - nested
if (!oTeammatches || [oTeammatches count] >1) {
NSLog(@"There is a problem with creating the offense team data");
}
else if ([oTeammatches count] == 0) {
if (!getFlag) {
//Code to initialize the team data in store
}
}
else if ([oTeammatches count] == 1) {
OTeam *newOTeam = [oTeammatches lastObject];
if (getFlag) {
//Retrieves data
//Shown by log lines beginning with "Getting"
}
else {
//Sets/Saves data
//Shown by log lines beginning with "Setting"
}
}
}
}];
if (!getFlag) {
[document updateChangeCount:UIDocumentChangeDone];
}
});
}
- (IBAction)pressBackButton:(UIButton *)sender {
[self addOrGetDataToGamesDatabase:self.gamesDatabase withFlag:NO];
if ((self.gamesDatabase.documentState & UIDocumentStateEditingDisabled) != UIDocumentStateEditingDisabled) {
[self.gamesDatabase saveToURL:self.gamesDatabase.fileURL forSaveOperation:UIDocumentSaveForOverwriting completionHandler:^(BOOL success) {
if (success) {
NSLog(@"DB save file path: %@", self.gamesDatabase.fileURL);
NSLog(@"Saved!!!");
}
else
NSLog(@"Unable to save");
}];
}
[self performSegueWithIdentifier:@"BackToPickGame" sender:self];
}
- (void)viewDidLoad
{
[super viewDidLoad];
//Some Initialization code
if (!self.gamesDatabase) {
NSURL *url = [[[NSFileManager defaultManager] URLsForDirectory:NSDocumentDirectory inDomains:NSUserDomainMask] lastObject];
url = [url URLByAppendingPathComponent:@"GameDB"];
self.gamesDatabase = [[CNPUIManagedDocument alloc] initWithFileURL:url];
NSLog(@"DB File URL generated: %@", url);
NSLog(@"self.gameDatabase initialized");
}
[self addOrGetDataToGamesDatabase:self.gamesDatabase withFlag:YES];
NSLog(@"Calling game with ID %@ , self.selectedGameID);
}
有关持久存储的一些日志信息
设备首先进入VC2
打印文档说明->\u persistentStoreCoordinator: 打印文档说明->\u persistentStoreCoordinator->persistentStores: ( ) 退出VC2时在VC2中首次设置
打印文档说明->\u persistentStoreCoordinator: 打印文档说明->\u persistentStoreCoordinator->persistentStores: ( (网址:file://localhost/var/mobile/Applications/4DD2D219-5AC1-406F-8020-260B01E46E0C/Documents/GameDB/StoreContent/persistentStore) ) 第二次进入VC2
打印文档说明->\u persistentStoreCoordinator: 打印文档说明->\u persistentStoreCoordinator->persistentStores: ( ) 模拟器
首先进入VC2
打印文档说明->\u persistentStoreCoordinator: 打印文档说明->\u persistentStoreCoordinator->persistentStores: ( (网址:file://localhost/Users/Rujul/Library/Application%20Support/iPhone%20Simulator/6.0/Applications/B187169B-8D32-4BB1-AB41-33DB76637D9C/Documents/GameDB/StoreContent/persistentStore) ) 退出VC2时第一次设置
打印文档说明->\u persistentStoreCoordinator: 打印文档说明->\u persistentStoreCoordinator->persistentStores: ( (网址:file://localhost/Users/Rujul/Library/Application%20Support/iPhone%20Simulator/6.0/Applications/B187169B-8D32-4BB1-AB41-33DB76637D9C/Documents/GameDB/StoreContent/persistentStore) ) 第二次进入VC2
打印文档说明->\u persistentStoreCoordinator: 打印文档说明->\u persistentStoreCoordinator->persistentStores: ( (网址:file://localhost/Users/Rujul/Library/Application%20Support/iPhone%20Simulator/6.0/Applications/B187169B-8D32-4BB1-AB41-33DB76637D9C/Documents/GameDB/StoreContent/persistentStore)
)检查代码中的所有覆盖内容(如上面的
UIDocumentSaveforOverwrite
中所述)。记录前后的精确值。我相信你会用这种方法找到罪犯的
另外,检查您在每个prepareforsgue:
中正在做什么
顺便说一句,我建议将混乱的
addOrGetDataToGamesDatabase
业务重构为两种易于理解的方法。Thx供您参考。不确定覆盖后要我检查哪些值。当我在退出VC2时设置值时,我检查设备上的persistentStore,我看到它被填充。我已经添加了一些关于persistentStore状态的信息。如果您能查看并发表评论,将不胜感激。