iOS Data Storage Guidelines Rejection - ios

Question

My app was rejected cause it must follow the iOS Data Storage Guidelines. I have already read some answer here on stackoverflow, and i have already read some blogs... I know my problem, at first application launch i copy 1 sqlite db and unzip some images in documents folder. The problem it's icloud that automaticcaly backup any files in documents directory. I don't need to use icloud in my app but my files must remain in document folder because they are the base data of my application and must be persit (cache folder or temp folder aren't correct solutions). So i've read about a flag that i can set file by file to forbid the backup :
[URL setResourceValue:[NSNumber numberWithBool:YES] forKey:NSURLIsExcludedFromBackupKey error:nil];
I have also read that this method works only in ios higher than 5.0.1, in the other it will be simply ignored (i have setted my ios deployment target to 4.3)... If i use this method my app will be rejected again because the older ios devices backup aren't managed? If yes there is a cross-iosversion method to set the NSURLIsExcludedFromBackupKey?
EDIT
I'm sorry icloud isn't present in ios earlier 5.0 so i think that the problem regards only differences beetween version 5.0 and 5.0.1, I'm wrong?

Answer 1

I have passed all files that will stored in documents folder through this method.
Try this
-(BOOL)addSkipBackupAttributeToItemAtURL:(NSURL *)URL
{
const char* filePath = [[URL path] fileSystemRepresentation];
const char* attrName = "com.apple.MobileBackup";
if (&NSURLIsExcludedFromBackupKey == nil) {
// iOS 5.0.1 and lower
u_int8_t attrValue = 1;
int result = setxattr(filePath, attrName, &attrValue, sizeof(attrValue), 0, 0);
return result == 0;
}
else {
// First try and remove the extended attribute if it is present
int result = getxattr(filePath, attrName, NULL, sizeof(u_int8_t), 0, 0);
if (result != -1) {
// The attribute exists, we need to remove it
int removeResult = removexattr(filePath, attrName, 0);
if (removeResult == 0) {
NSLog(#"Removed extended attribute on file %#", URL);
}
}
// Set the new key
NSError *error = nil;
[URL setResourceValue:[NSNumber numberWithBool:YES] forKey:NSURLIsExcludedFromBackupKey error:&error];
return error == nil;
}
}
I've found this method here in Stack Overflow:
Use NSURLIsExcludedFromBackupKey without crashing on iOS 5.0

Answer 2

NOTE:
do not use
NSString *mediaDir = [NSString stringWithFormat:#"%#/Library/Caches/%#", NSHomeDirectory(), MEDIA_DIRECTORY];
since you are making assumptions about the name.
rather, use:
NSArray* lCachePaths = NSSearchPathForDirectoriesInDomains(NSCachesDirectory, NSUserDomainMask, YES);
NSString* lCacheDirectory = [lCachePaths objectAtIndex:0];

Answer 3

In my app I solved it by adding the files (images in my case) to the bundle,
and check in the method where I load the images if they exist in the document folder where the user generated data / images will be placed.
If it isn't there, I know it's one of my prepopulated images and I load it from the bundle.
For the sqlite file:
Not a really satisfying solution, but I create the data in code now, instead of a prepopulated sqlite file.

Answer 4

For media files, we store them in the Caches/ directory. During application startup, we check if they are there. Otherwise the images are either loaded from the bundle (in your case unzipped) or in our case re-downloaded from the Server.
The exact location is
NSString *mediaDir = [NSString stringWithFormat:#"%#/Library/Caches/%#", NSHomeDirectory(), MEDIA_DIRECTORY];
which is the place where you SHOULD store your temporary files. The files in the cache are generally persistent, much more so than in Temp, but can be deleted at some point.