Why NSMutableDictionary don't want write to file?

Question

- (void)viewDidLoad
{
    [super viewDidLoad];
    if ([[NSFileManager defaultManager] fileExistsAtPath:pathString]) 
    {
        infoDict = [[NSMutableDictionary          


        

Answer 1

writeToFile:atomically only works if the dictionary you call it on is a valid property list object (see docs).

For a NSDictionary to be a valid property list object, among other things, its keys must be strings, but in your example the keys are NSNumber instances.