moving text from bottom to top like marquee style in iOS application using textView

Moving text like marquee style from bottom to top in iOS application. i have tried this long time using google search but i could not get perfect answer for this question please provide any code for this question. i an new to iOS application.

Try this

#import "ViewController.h"

@interface ViewController ()

@end

@implementation ViewController

NSTimer *timer;
UILabel *label ;

- (id)initWithNibName:(NSString *)nibNameOrNil bundle:(NSBundle *)nibBundleOrNil
{
    self = [super initWithNibName:nibNameOrNil bundle:nibBundleOrNil];
    if (self) {
    }
    return self;
}

- (void)viewDidLoad
{
    [super viewDidLoad];
    timer =[NSTimer scheduledTimerWithTimeInterval:0.1 target:self selector:@selector(scrollText:) userInfo:nil repeats:YES];
    label = [[UILabel alloc] initWithFrame:CGRectMake(20, 50, 250, 20)];

    label.text =@"This is a string to be scroll";
    [self.view addSubview:label];

}

-(void)scrollText:(id)parameter{
    if (label.frame.origin.y <= 50) {
        [label setFrame:CGRectMake(label.frame.origin.x, 400, label.frame.size.width, label.frame.size.height)];
    }
    else
    [label setFrame:CGRectMake(label.frame.origin.x, label.frame.origin.y-5, label.frame.size.width, label.frame.size.height)];
}

@end