Best way to save to nsuserdefaults for custom class?

Question

If I have a custom class Person which has three variables (which are propertized and synthesized):

NSString* theName;
float* theHeight;
int theAge;
         


        

Answer 1

@Brad Smith's answer is not complete, and even is incorrect in some sense. We have to use NSKeyedArchiver and NSKeyedUnarchiver as follows:

Make your class (for example in this case Person) to conform to protocol NSCoding and implement both the methods as:

- (id)initWithCoder:(NSCoder *)decoder {
    self = [super init];
    if(self) {
        self.name = [decoder decodeObjectForKey:];
        // as height is a pointer
        *self.height = [decoder decodeFloatForKey:];
        self.age = [decoder decodeIntForKey:];
    }
    return self;
}

- (void)encodeWithCoder:(NSCoder *)encoder {
    [encoder encodeObject:self.name forKey:];
    //as height is a pointer
    [encoder encodeFloat:*self.height forKey:]
    [encoder encodeInt:self.age forKey:];
}

Using NSUserDefaults

// Write to NSUserDefaults
NSData *archivedObject = [NSKeyedArchiver archivedDataWithRootObject:];
NSUserDefaults *defaults = [NSUserDefaults standardUserDefaults];
[defaults setObject:archivedObject forKey:];
[defaults synchronize];

// Read from NSUserDefaults
NSUserDefaults *defaults = [NSUserDefaults standardUserDefaults];
NSData *archivedObject = [defaults objectForKey:];
 *obj = ( *)[NSKeyedUnarchiver unarchiveObjectWithData:archivedObject];