如何在NSUserDefaults中设置NSArray？

Question

I'm wondering why there is a -arrayForKey: method, but no -setArrayForKey: method. How could I set that array?

Answer 1

Just use setObject:forKey: . I guess the reason that there's a special arrayForKey: and dictionaryForKey: etc. is that you get better type safety and don't have to cast. If you use these methods and the element in the defaults does not match the type, then nil is returned.

Answer 2

arrayForKey and dictionaryForKey are getters. Use setObject to set an array.

Answer 3

- (void)setObject:(id)value forKey:(NSString *)defaultName

This allows one to set any typical plist object, including an NSArray.

arrayForKey appears to just be a convenience method.