在XCode中编译和运行使用Core Data的项目时,我遇到了一个我从未见过的错误：
2013-09-12 16:59:10.156 myapp[57811:70b] CoreData: error:
(14) I/O error for database at /Users/administrador/Library/
Application Support/iPhone Simulator/7.0/Applications/
6BA67336-B093-46CF-8B11-E3595409DAC2/myapp.app/database.sqlite.
sqlite error code:14,'unable to open database file'
psc = [[NSPersistentStoreCoordinator alloc]
initWithManagedObjectModel:self.managedObjectModel];
NSURL *storeURL = [[NSBundle mainBundle]
URLForResource:@"database" withExtension:@"sqlite"];
[psc addPersistentStoreWithType:NSsqliteStoreType
configuration:nil URL:storeURL
options:@{NSReadOnlyPersistentStoreOption : @YES} error:NULL];
我尝试过Build-> Clean,删除派生数据,卸载应用程序.
我在发布之前检查了this question,我相信问题是不同的.
注意：sqlite是应用程序的资源
使用调试建议的信息
2013-09-12 17:43:38.341 myapp[58322:70b] CoreData: annotation: Connecting to sqlite database file at "/Users/administrador/Library/Application Support/iPhone Simulator/7.0/Applications/6BA67336-B093-46CF-8B11-E3595409DAC2/myapp.app/database.sqlite" 2013-09-12 17:43:38.360 myapp[58322:70b] CoreData: sql: SELECT Z_VERSION,Z_UUID,Z_PLIST FROM Z_MetaDATA 2013-09-12 17:43:38.363 myapp[58322:70b] CoreData: annotation: Disconnecting from sqlite database due to an error. 2013-09-12 17:43:38.364 myapp[58322:70b] CoreData: error: (14) I/O error for database at /Users/administrador/Library/Application Support/iPhone Simulator/7.0/Applications/6BA67336-B093-46CF-8B11-E3595409DAC2/myapp.app/database.sqlite. sqlite error code:14,'unable to open database file' 2013-09-12 17:43:38.366 myapp[58322:70b] CoreData: annotation: Disconnecting from sqlite database.
解决方法
既然iOS7上的NDA已被解除,我可以发布为完成我发现的这个问题的解决方法.
iOS7中的核心数据默认使用sqlite中的WAL.
唯一可行的解决方案是使用没有WAL的iOS6模拟器创建sqlite并将其导入项目中：
- (NSPersistentStoreCoordinator *)persistentStoreCoordinator
{
static NSPersistentStoreCoordinator *psc;
static dispatch_once_t onceToken;
dispatch_once(&onceToken,^{
psc = [[NSPersistentStoreCoordinator alloc]
initWithManagedObjectModel:self.managedObjectModel];
NSURL *storeURL = [[NSBundle mainBundle]
URLForResource:@"database" withExtension:@"sqlite"];
[psc addPersistentStoreWithType:NSsqliteStoreType
configuration:nil
URL:storeURL
options:@{NSReadOnlyPersistentStoreOption : @YES,NSsqlitePragmasOption: @{@"journal_mode":@"DELETE"}}
error:NULL];
});
return psc;
}
