Question

My iPhone application contains approx 500 MB data. and application will use this data offline. So i mark the folder to do not backup/copy on iTunes. so i am using below url :
https://gist.github.com/1999985

But it says ‘NSURLIsExcludedFromBackupKey’ undeclared. and i also tried to used https://developer.apple.com/library/ios/#qa/qa1719/_index.html
but i always return false..

So please let me know how it will works??

Thx

Answer 1

NSURLIsExcludedFromBackupKey should compile fine on 5.1+ SDK.
As the key is not available for 5.0, the following snippet could act as a workaround.

if (SYSTEM_VERSION_LESS_THAN_OR_EQUAL_TO(@"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;
}          
if (SYSTEM_VERSION_GREATER_THAN_OR_EQUAL_TO(@"5.1"))
{
    NSError *error = nil;
    //[URL setResourceValue:[NSNumber numberWithBool:YES] forKey:NSURLIsExcludedFromBackupKey error:&error];
    [URL setResourceValue:[NSNumber numberWithBool:YES] forKey:@"NSURLIsExcludedFromBackupKey" error:&error];
    return error == nil;
}