Question

read in did load:

 NSFileManager *fileManager = [NSFileManager defaultManager];

if (![fileManager fileExistsAtPath: path]) //4
{
    NSString *bundle = [[NSBundle mainBundle] pathForResource:@"data" ofType:@"plist"]; //5

    [fileManager copyItemAtPath:bundle toPath: path error:&error]; //6
}

//load in text fields.
NSMutableDictionary *savedData = [[NSMutableDictionary alloc] initWithContentsOfFile: path];

nameField.text = [[savedData objectForKey:@"name"] stringValue];
locationTextField.text = [[savedData objectForKey:@"location"] stringValue];
sectorTextField.text = [[savedData objectForKey:@"sector"] stringValue];

Write on button click:

    - (IBAction)writingButton:(id)sender
{
    NSMutableDictionary *data = [[NSMutableDictionary alloc] initWithContentsOfFile: path];

    //[data setObject:[NSNumber numberWithInt:value] forKey:@"value"];
    [data setObject:[NSString stringWithString:nameField.text] forKey:@"name"];
    [data setObject:[NSString stringWithString:locationTextField.text] forKey:@"location"];
    [data setObject:[NSString stringWithString:sectorTextField.text] forKey:@"sector"];
}

the plist file:

The error:

2012-09-04 17:03:40.360 app[4849:c07] -[__NSCFString stringValue]:
unrecognized selector sent to instance 0x6aa38f0 2012-09-04
17:03:40.362 app[4849:c07] *** Terminating app due to uncaught
exception ‘NSInvalidArgumentException’, reason: ‘-[__NSCFString
stringValue]: unrecognized selector sent to instance 0x6aa38f0’

Any ideas? cheers.

Answer 1

The dictionary stores NSString objects directly – there’s no need to call a (nonexistent) method called - stringValue. Simply write

nameField.text = [savedData objectForKey:@"name"];

and so on.

(Why do you think this method call would have been necessary?)