In 10.10.5 using a $-prefixed archiving key does NOT work.
Does it work in 10.11?
If not, I will file a bug.
Gerriet.
This is my test code:
#import "AppDelegate.h"
static NSString *const kArchivingKey = @"$my archiving key"; // no bug
without leading '$'
@interface AppDelegate ()
@property (weak) IBOutlet NSWindow *window;
@property (strong) NSString *myName;
@end
@implementation AppDelegate
- (void)applicationDidFinishLaunching:(NSNotification *)aNotification
{
/* Archives and Serializations Programming Guide →
Encoding and Decoding Objects → Performance Considerations says:
"Avoid using “$” as a prefix for your keys.
The keyed archiver and unarchiver use keys prefixed with “$”
for internal values.
Although they test for and mangle user-defined keys that have a
“$” prefix, this overhead makes
archiving slower."
Note: this cleary implies: using “$” as a prefix for keys is
allowed, albeit slow.
Fact: In 10.10.5 using “$” as a prefix for keys does NOT work.
**/
self.myName = @"สิงโต"; // use anything ≠ nil; If "สิงโต" seems
too scary, use "pussycat" instead.
NSData *data = [ NSKeyedArchiver archivedDataWithRootObject: self ];
AppDelegate *selfCopy = [ NSKeyedUnarchiver unarchiveObjectWithData:
data ];
NSLog(@"%s selfCopy = %@",__FUNCTION__, selfCopy);
}
- (NSString *)description
{
NSString *s = [ NSString stringWithFormat: @"[%@ name: %@]", [self
class], self.myName ];
return s;
}
- (void)encodeWithCoder:(NSCoder *)coder
{
[ coder encodeObject: self.myName forKey: kArchivingKey ];
}
- (id)initWithCoder:(NSCoder *)decoder
{
self = [super init];
if ( self == nil ) return nil;
_myName = [ decoder decodeObjectForKey: kArchivingKey ];
if ( _myName == nil ) // error → try badKey instead
{
NSLog(@"%s Error: got nil for kArchivingKey =
\"%@\"",__FUNCTION__, kArchivingKey);
NSString *badKey = [ @"$$" stringByAppendingString:
kArchivingKey ];
_myName = [ decoder decodeObjectForKey: badKey ];
if ( _myName == nil ) // ok
{
NSLog(@"%s Ok got nil for badKey = \"$$\" +
kArchivingKey",__FUNCTION__);
}
else // error
{
NSLog(@"%s Error: badKey = \"$$\" + kArchivingKey →
%@",__FUNCTION__, _myName);
};
}
else // ok
{
NSLog(@"%s Ok kArchivingKey = \"%@\" → %@",__FUNCTION__,
kArchivingKey, _myName);
};
return self;
}
@end
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