- (void)prepareForSegue:(UIStoryboardSegue *)segue sender:(id)sender{
    if([segue.identifier isEqualToString:@"segue"]){

        SubViewController *subViewController=segue.destinationViewController;

        NSDictionary *per=[self.personArray objectAtIndex:self.selectedIndexPath.row];
        subViewController.name.text=[per objectForKey:@"name"];
        subViewController.tel.text=[per objectForKey:@"tel"];
//name与tel是UITextField

    }
}

[per objectForKey:@"name"]的值是@“boy”，但是subViewController.name.text的值为nil。为啥会是nil呢？