The check for availability seems to be working fine but I can't seem to set the NSURLIsExcludedFromBackupKey
key without getting this crash on launch:
dyld: Symbol not found: _NSURLIsExcludedFromBackupKey Referenced from: /Users/sam/Library/Application Support/iPhone Simulator/5.0/Applications/B0872A19-3230-481C-B5CE-D4BDE264FBDF/Transit.app/Transit Expected in: /Applications/Xcode.app/Contents/Developer/Platforms/iPhoneSimulator.platform/Developer/SDKs/iPhoneSimulator5.0.sdk/System/Library/Frameworks/Foundation.framework/Foundation in /Users/sam/Library/Application Support/iPhone Simulator/5.0/Applications/B0872A19-3230-481C-B5CE-D4BDE264FBDF/Transit.app/Transit
Here's my method:
- (BOOL)addSkipBackupAttributeToItemAtURL:(NSURL *)URL {
if (&NSURLIsExcludedFromBackupKey == nil)
return NO;
NSError *error;
[URL setResourceValue:[NSNumber numberWithBool:YES] forKey:NSURLIsExcludedFromBackupKey error:&error];
return (error != nil);
}
Crash goes away if I comment out this line:
[URL setResourceValue:[NSNumber numberWithBool:YES] forKey:NSURLIsExcludedFromBackupKey error:&error];
Do I have to weak-link Foundation?
EDIT: not sure if it makes a difference, but this method is put inside an NSFileManager
category.