[XCode] bouton pour faire progresser un slider

Voila le code pour y voir plus clair. merci
Code:
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@interface ViewController ()

@end

@implementation ViewController
@synthesize testscroll;
@synthesize monImage;
@synthesize slider;
@synthesize label;
@synthesize datePicker;


- (void)viewDidLoad
{
    [super viewDidLoad];
    NSURL *uneImage = [NSURL URLWithString: @"http://google.fr//0101.jpg"];
    monImage.image = [UIImage imageWithData: [NSData dataWithContentsOfURL: uneImage]];   

    [testscroll setScrollEnabled:YES];
   
       
    testscroll.contentSize = CGSizeMake(786,381);
    testscroll.maximumZoomScale = 3.0;
    testscroll.minimumZoomScale = 0.1;
    
    testscroll.delegate = self;
    [testscroll addSubview:monImage];

        
 
}

- (UIView *)viewForZoomingInScrollView:(UIScrollView *)scrollView
{
    return monImage;
}

- (void)viewDidUnload
{
    [self setTestscroll:nil];
    [self setMonImage:nil];
    [self setSlider:nil];
    [self setLabel:nil];
    datePicker = nil;
    [self setDatePicker:nil];
    [super viewDidUnload];
    // Release any retained subviews of the main view.
}



- (BOOL)shouldAutorotateToInterfaceOrientation:(UIInterfaceOrientation)interfaceOrientation
{
    return (interfaceOrientation != UIInterfaceOrientationPortraitUpsideDown);
}


- (IBAction)slidetheslider:(id)sender {
    NSInteger hh,mm;
    mm = slider.value;
    mm *= 15;
    hh = mm/60;
    mm = mm - hh *60;
    label.text = [NSString stringWithFormat:@"%2.2dh%2.2d",hh,mm];
    label.text = [NSString stringWithFormat:@"%2.2dh%2.2d",hh,mm];
    NSString *nascubeimage=[NSString stringWithFormat:@"http://google.fr//%2.2d%2.2d.jpg",hh,mm]; 
    NSURL *uneImage = [NSURL URLWithString:nascubeimage];                                                                                
    monImage.image = [UIImage imageWithData: [NSData dataWithContentsOfURL: uneImage]];
    
   // timer=[NSTimer scheduledTimerWithTimeInterval:10
     //          target:self selector:@selector(myTimerMethod)
     //          userInfo:nil repeats:YES];
}   

- (IBAction)button:(id)sender {

    NSDate *choice = [datePicker date];
    NSCalendar *calendrier = [NSCalendar currentCalendar];
    NSDateComponents *composants = [calendrier components:(NSYearCalendarUnit | NSMonthCalendarUnit | NSDayCalendarUnit | NSHourCalendarUnit | NSMinuteCalendarUnit | NSSecondCalendarUnit) fromDate:choice];
    NSString *words = [[NSString alloc]initWithFormat:@"%i%2.2i%2.2i",[composants year],[composants month],[composants day]];
    labelDate.text = words;
    
    
    
 }