Why i cannot convert NSString to NSData

In my People.h, I implement NSCoding, In People.m:

@implementation People
@synthesize name;

- (void) encodeWithCoder:(NSCoder *)aCoder {
    [aCoder encodeObject:name forKey:@"name"];
}



-(id) initWithCoder:(NSCoder *)aDecoder {
    if (self = [super init]) {
        self.name = [aDecoder decodeObjectForKey:@"name"];
    }
    return self;
}

@end

In my viewDidLoad function of co开发者_如何学编程ntroller.

People *people1 = [[People alloc] init];
people1.name = @"kevin";


NSData *saveData = [NSKeyedArchiver  archivedDataWithRootObject:people1];

NSString *saveDataString = [[NSString alloc] initWithData:saveData encoding:NSASCIIStringEncoding];
NSData *resultData = [saveDataString dataUsingEncoding:NSASCIIStringEncoding];

People *people2 = [NSKeyedUnarchiver unarchiveObjectWithData:resultData];
NSLog(@"%@",people2.name);


[super viewDidLoad];

Why i got a null at the end of this function. Did I hava some mistakes?

Thanks!

It looks like you were trying to unarchive Peopla out of NSString, try this

NSData *saveData = [NSKeyedArchiver  archivedDataWithRootObject:people1];
People *people2 = [NSKeyedUnarchiver unarchiveObjectWithData:saveData];