好的，这是我设法获得批准的解决方案（终于！）
这是设置 Skip Backup 属性的代码 - 请注意，对于 5.0.1 及更低版本和 5.1 及更高版本，它是不同的。
#include <sys/xattr.h>
- (BOOL)addSkipBackupAttributeToItemAtURL:(NSURL *)URL
{
if (&NSURLIsExcludedFromBackupKey == nil) { // iOS <= 5.0.1
const char* filePath = [[URL path] fileSystemRepresentation];
const char* attrName = "com.apple.MobileBackup";
u_int8_t attrValue = 1;
int result = setxattr(filePath, attrName, &attrValue, sizeof(attrValue), 0, 0);
return result == 0;
} else { // iOS >= 5.1
NSError *error = nil;
[URL setResourceValue:[NSNumber numberWithBool:YES] forKey:NSURLIsExcludedFromBackupKey error:&error];
return error == nil;
}
}
这是我的persistentStoreCoordinator
- (NSPersistentStoreCoordinator *)persistentStoreCoordinator {
if (__persistentStoreCoordinator != nil)
{
return __persistentStoreCoordinator;
}
NSURL *storeURL = [[self applicationDocumentsDirectory] URLByAppendingPathComponent:@"store.sqlite"];
NSError *error;
NSFileManager *fileManager = [NSFileManager defaultManager];
NSString *storePath = [[[self applicationDocumentsDirectory] path] stringByAppendingPathComponent:@"store.sqlite"];
// For iOS 5.0 - store in Caches and just put up with purging
// Users should be on at least 5.0.1 anyway
if ([[[UIDevice currentDevice] systemVersion] isEqualToString:@"5.0"]) {
NSArray *paths = NSSearchPathForDirectoriesInDomains(NSCachesDirectory, NSUserDomainMask, YES);
NSString *cacheDirectory = [paths objectAtIndex:0];
NSString *oldStorePath = [storePath copy];
storePath = [cacheDirectory stringByAppendingPathComponent:@"store.sqlite"];
storeURL = [NSURL URLWithString:storePath];
// Copy existing file
if ([fileManager fileExistsAtPath:oldStorePath]) {
[fileManager copyItemAtPath:oldStorePath toPath:storePath error:NULL];
[fileManager removeItemAtPath:oldStorePath error:NULL];
}
}
// END iOS 5.0
if (![fileManager fileExistsAtPath:storePath]) {
// File doesn't exist - copy it over
NSString *defaultStorePath = [[NSBundle mainBundle] pathForResource:@"store" ofType:@"sqlite"];
if (defaultStorePath) {
[fileManager copyItemAtPath:defaultStorePath toPath:storePath error:NULL];
}
}
NSDictionary *options = [NSDictionary dictionaryWithObjectsAndKeys: [NSNumber numberWithBool:YES], NSMigratePersistentStoresAutomaticallyOption, [NSNumber numberWithBool:YES], NSInferMappingModelAutomaticallyOption, nil];
__persistentStoreCoordinator = [[NSPersistentStoreCoordinator alloc] initWithManagedObjectModel:[self managedObjectModel]];
if (![__persistentStoreCoordinator addPersistentStoreWithType:NSSQLiteStoreType configuration:nil URL:storeURL options:options error:&error])
{
NSLog(@"Unresolved error %@, %@", error, [error userInfo]);
abort();
}
[self addSkipBackupAttributeToItemAtURL:storeURL];
return __persistentStoreCoordinator;
}
请注意，我决定只Caches为 iOS 5.0 用户存储并忍受清除。
这是苹果本月批准的。
请不要在没有先阅读和理解的情况下复制和粘贴此代码 - 它可能不完全准确或优化，但我希望它可以指导某人找到对他们有帮助的解决方案。