NSUserDefaults: How to display user defaults when valueforKey is an ENUM - iphone

Question

In iPhone app, How to display values in console for user defaults when valueforKey is an ENUM?
Currently with the below code if I try to display in console then it crashes with no crash log in console.
NSLog(#"%#",[[NSUserDefaults standardUserDefaults] valueForKey:Enum]);

Answer 1

To fetch:
int someValue = [[NSUserDefaults standardDefaults] integerForKey:#"your key here"];
to save:
[[NSUserDefaults standardDefaults] setInteger:10 forKey:#"your key here"];
EDIT: got it, you crash because in NSLog you are using the wrong format:
NSLog(#"%i",[[NSUserDefaults standardUserDefaults] valueForKey:Enum]);
try %i (to print integers) instead of %# (used to print valid objective-c objects)

Answer 2

Since an enum is really just a fancy way of displaying an int, all you have to do is create an enum variable and set it to the value you get from NSUserDefaults.
You may end up with something like:
PirateEnumType pirateType = [[NSUserDefaults standardUserDefaults] integerForKey:#"PirateType"];
EDIT:
I'm sorry. I guess I didn't fully understand your question. Since an enum is really an int, you will need to use "%i" to display it instead of "%#".
In order to show it properly as a human readable string, you would need to have some sort of enumToString function, perhaps like:
-(NSString*)enumToString:(PirateEnumType)enumValue {
NSString* returnValue = #"";
switch (enumValue) {
case Captain:
returnValue = #"Captain";
break;
case Swashbuckler:
returnValue = #"Swashbuckler";
break;
case PegLeg:
returnValue = #"PegLeg";
break;
}
return returnValue;
}

Answer 3

NSUserDefaults objects are really just NSDictionary objects. NSDictionary only takes an object as a key. Enum is just an integer, so you can't use it as a key directly. One way to do it, though is to use NSNumber, which can represent an integer as an object like the following:
[[NSUserDefaults standardDefults] valueForKey:[NSNumber numberWithInt:yourEnum];
To set the value you would do:
[[NSUserDefaults standardDefaults] setValue:yourValue forKey:[NSNumber numberWithInt:yourEnum]];

Answer 4

There are two issues here. Firstly, an enum cannot be a key in valueForKey. valueForKey can only accept strings, not string values of enums. Therefore, you need to implement a method to get a string value from an enum. In my example below that method is stringFromEnum. Here is one example of how to get a string from an enum.
Sometimes I've seen NSLog choke when I ask it to directly include the return value of a message sent to an object. I've always found that assign the result of that message to an instance variable first and then passing the value of that instance variable into NSLog instead solved the problem, but admit I haven't figured out what the relevant factors are that determine when it does or does not work the original way. Interested in any comments.
NSString *myKey = [self stringFromEnum:Enum];
NSString *myStringToLog = [[NSUserDefaults standardUserDefaults] valueForKey:myKey];
NSLog(#"%#", myStringToLog);
Another reading of your question could be that your instance variable Enum is actually a string, which is the Key for an enum that will be returned from NSUserDefaults. However, that can't be the case, as NSUserDefaults will not store an enum. See the documentation for object types that are supported. If that's what you're trying to do, your problem may be partly in other code where you're trying to store the enum in the first place?