我正在为现有应用程序添加iCloud。同步工作正常，但是我需要排除一些实体，或想出一个解决方案，因为我的一些核心数据正在重复。例如：
1. 创建单独的本地和云存储，听起来很有前途，但不确定如何进行，因为这是我第一次尝试使用 iCloud 和 Core Data。
2. 第二个建议是将同步到包含唯一设备标识符的实体，但已被弃用，同样不确定 Core Data 的处理过程。
CertificateColour 发送到表视图，现在每行都显示两次。 CertificateType 在操作表中呈现四个选项，现在有8行存在，每行都被重复一次。我正在使用https://github.com/mluisbrown/iCloudCoreDataStack 进行核心数据同步。我查看了 Core data + iCloud: exclude certain attributes from sync? 它建议了几件事：1. 创建单独的本地和云存储，听起来很有前途，但不确定如何进行，因为这是我第一次尝试使用 iCloud 和 Core Data。
2. 第二个建议是将同步到包含唯一设备标识符的实体，但已被弃用，同样不确定 Core Data 的处理过程。
AppDelegate.h
#import <UIKit/UIKit.h>
#import <sqlite3.h>
#import "PersistentStack.h"
@interface ICAppDelegate : UIResponder <UIApplicationDelegate>
@property (strong, nonatomic) UIWindow *window;
@property (strong, nonatomic) UINavigationController *navigationController;
@property (readonly, strong, nonatomic) NSManagedObjectContext *managedObjectContext;
@property (readonly, strong, nonatomic) NSManagedObjectModel *managedObjectModel;
@property (readonly, strong, nonatomic) NSPersistentStoreCoordinator *persistentStoreCoordinator;
- (void)saveContext;
- (NSURL *)applicationDocumentsDirectory;
@end
Appdelegate.m
@interface ICAppDelegate () <DBSessionDelegate, DBNetworkRequestDelegate>
//iCloud
@property (nonatomic, strong) PersistentStack* persistentStack;
@property (nonatomic, strong) NSManagedObjectContext* managedObjectContext;
@end
@implementation ICAppDelegate
@synthesize window = _window;
@synthesize navigationController = _navigationController;
@synthesize managedObjectContext = __managedObjectContext;
@synthesize managedObjectModel = __managedObjectModel;
@synthesize persistentStoreCoordinator = __persistentStoreCoordinator;
- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions
{
//iCloud
self.persistentStack = [[PersistentStack alloc] initWithStoreURL:self.storeURL modelURL:self.modelURL];
self.managedObjectContext = self.persistentStack.managedObjectContext;
BOOL populateData = NO;
BOOL copyDb = YES;
// Copy DB to documents directory
if (copyDb == YES) {
NSString *srcPath = [[NSBundle mainBundle] pathForResource:@"myApp" ofType:@"sqlite"];
NSString *destPath = [[NSHomeDirectory() stringByAppendingPathComponent:@"Documents"] stringByAppendingPathComponent:@"myApp.sqlite"];
if (![[NSFileManager defaultManager] fileExistsAtPath:srcPath]) {
DebugLog(@"Source file doesn't exist");
}
if (![[NSFileManager defaultManager] fileExistsAtPath:destPath]) {
DebugLog(@"Copying DB to documents directory");
NSError *error = nil;
[[NSFileManager defaultManager] copyItemAtPath:srcPath toPath:destPath error:&error];
if (error != nil) {
DebugLog(@"Copy failed %@", [error localizedDescription]);
}
}
}
/////*****ALL OF THIS IS DUPLICATED AND NEEDS EXCLUDING FROM ICLOUD BACK UP****////////////
if (populateData) {
DebugLog(@"Populating database");
NSManagedObjectContext *context = [self managedObjectContext];
Subscription *subscription = (Subscription *)[NSEntityDescription insertNewObjectForEntityForName:@"Subscription" inManagedObjectContext:context];
subscription.subscribed = @NO;
CertificateColour *red = (CertificateColour *)[NSEntityDescription insertNewObjectForEntityForName:@"CertificateColour" inManagedObjectContext:context];
red.name = @"Red";
red.redComponent = @1.0f;
red.greenComponent = @0.0f;
red.blueComponent = @0.0f;
CertificateColour *purple = (CertificateColour *)[NSEntityDescription insertNewObjectForEntityForName:@"CertificateColour" inManagedObjectContext:context];
purple.name = @"Purple";
purple.redComponent = @0.4f;
purple.greenComponent = @0.0f;
purple.blueComponent = @0.6f;
CertificateColour *green = (CertificateColour *)[NSEntityDescription insertNewObjectForEntityForName:@"CertificateColour" inManagedObjectContext:context];
green.name = @"Green";
green.redComponent = @0.0f;
green.greenComponent = @0.6f;
green.blueComponent = @0.2f;
CertificateColour *blue = (CertificateColour *)[NSEntityDescription insertNewObjectForEntityForName:@"CertificateColour" inManagedObjectContext:context];
blue.name = @"Blue";
blue.redComponent = @0.0f;
blue.greenComponent = @0.2f;
blue.blueComponent = @1.0f;
ICCertificateTypeManager *ctm = [ICCertificateTypeManager manager];
CertificateType *type = [ctm newCertificateType];
type.title = @"Works";
type.identifier = @(Works);
type = [ctm newCertificateType];
type.title = @"Type1";
type.identifier = @(Type1);
type = [ctm newCertificateType];
type.title = @"Type2";
type.identifier = @(Type2);
type = [ctm newCertificateType];
type.title = @"Type4";
type.identifier = @(Type3);
[self saveContext];
}
if ([[ICWebServiceClient sharedInstance] isLoggedIn])
{
DebugLog(@"User is logged in ");
}
////////////////////////////////////////////////////////////
return YES;
}
- (BOOL)application:(UIApplication *)application handleOpenURL:(NSURL *)url {
LogCmd();
if ([[DBSession sharedSession] handleOpenURL:url]) {
if ([[DBSession sharedSession] isLinked]) {
DebugLog(@"handling url");
}
return YES;
}
return NO;
}
- (void)applicationWillResignActive:(UIApplication *)application
{
}
- (void)applicationDidEnterBackground:(UIApplication *)application
{
[self.managedObjectContext save:NULL];
}
- (void)applicationWillEnterForeground:(UIApplication *)application
{
}
- (void)applicationDidBecomeActive:(UIApplication *)application
{
}
- (void)applicationWillTerminate:(UIApplication *)application
{
[self saveContext];
}
- (void)saveContext
{
NSError *error = nil;
NSManagedObjectContext *managedObjectContext = self.managedObjectContext;
if (managedObjectContext != nil) {
if ([managedObjectContext hasChanges] && ![managedObjectContext save:&error]) {
NSLog(@"Unresolved error %@, %@", error, [error userInfo]);
abort();
}
}
}
#pragma mark - DBSessionDelegate
- (void)sessionDidReceiveAuthorizationFailure:(DBSession*)session userId:(NSString *)userId
{
LogCmd();
}
#pragma mark - DBNetworkRequestDelegate
static int outstandingRequests;
- (void)networkRequestStarted {
outstandingRequests++;
if (outstandingRequests == 1) {
[[UIApplication sharedApplication] setNetworkActivityIndicatorVisible:YES];
}
}
- (void)networkRequestStopped {
outstandingRequests--;
if (outstandingRequests == 0) {
[[UIApplication sharedApplication] setNetworkActivityIndicatorVisible:NO];
}
}
#pragma mark - Core Data stack
// Returns the managed object context for the application.
// If the context doesn't already exist, it is created and bound to the persistent store coordinator for the application.
- (NSManagedObjectContext *)managedObjectContext
{
if (__managedObjectContext != nil) {
return __managedObjectContext;
}
NSPersistentStoreCoordinator *coordinator = [self persistentStoreCoordinator];
if (coordinator != nil) {
__managedObjectContext = [[NSManagedObjectContext alloc] init];
[__managedObjectContext setPersistentStoreCoordinator:coordinator];
}
return __managedObjectContext;
}
// Returns the managed object model for the application.
// If the model doesn't already exist, it is created from the application's model.
- (NSManagedObjectModel *)managedObjectModel
{
if (__managedObjectModel != nil) {
return __managedObjectModel;
}
NSURL *modelURL = [[NSBundle mainBundle] URLForResource:@"myApp" withExtension:@"momd"];
__managedObjectModel = [[NSManagedObjectModel alloc] initWithContentsOfURL:modelURL];
return __managedObjectModel;
}
// Returns the persistent store coordinator for the application.
// If the coordinator doesn't already exist, it is created and the application's store added to it.
- (NSPersistentStoreCoordinator *)persistentStoreCoordinator
{
if (__persistentStoreCoordinator != nil) {
return __persistentStoreCoordinator;
}
NSURL *storeURL = [[self applicationDocumentsDirectory] URLByAppendingPathComponent:@"myApp.sqlite"];
NSError *error = nil;
__persistentStoreCoordinator = [[NSPersistentStoreCoordinator alloc] initWithManagedObjectModel:[self managedObjectModel]];
if (![__persistentStoreCoordinator addPersistentStoreWithType:NSSQLiteStoreType configuration:nil URL:storeURL options:nil error:&error]) {
NSLog(@"Unresolved error %@, %@", error, [error userInfo]);
abort();
}
return __persistentStoreCoordinator;
}
#pragma mark - Application's Documents directory
// Returns the URL to the application's Documents directory.
- (NSURL *)applicationDocumentsDirectory
{
return [[[NSFileManager defaultManager] URLsForDirectory:NSDocumentDirectory inDomains:NSUserDomainMask] lastObject];
}
#pragma mark - iCloud store
- (NSURL*)storeURL
{
NSURL* documentsDirectory = [[NSFileManager defaultManager] URLForDirectory:NSDocumentDirectory inDomain:NSUserDomainMask appropriateForURL:nil create:YES error:NULL];
return [documentsDirectory URLByAppendingPathComponent:@"myApp.sqlite"];
}
- (NSURL*)modelURL
{
return [[NSBundle mainBundle] URLForResource:@"myApp" withExtension:@"momd"];
}
@end