无法从NSUserDefault获取值

Question

I am just used below code to store array into userdefault

[[NSUserDefaults standardUserDefaults] setObject:artists forKey:@"test"];
[[NSUserDefaults standardUserDefaults] synchronize];

and then if we retrieve the data from below code

NSUserDefaults *defaults = [NSUserDefaults standardUserDefaults];
artists = [defaults objectForKey:@"test"];

but I am not able to get the data. Thanks in advance.

Answer 1

What does the array contain? Only certain types of content can be encoded into NSUserDefaults. The array must be able to be converted to a plist. The doc for NSUserDefaults says:

A default object must be a property list, that is, an instance of (or for collections a combination of instances of): NSData, NSString, NSNumber, NSDate, NSArray, or NSDictionary.