how can I scroll the view automatically on changing slider value

I want to control sc开发者_开发百科roll bar by slider so when user slides the slider scroll bar should also scroll the view.

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Assuming your slider is declared as 'slider' and the scroll view is declared as 'scrollView':

    [slider addTarget:self action:@selector(sliderChanged:)
         forControlEvents:UIControlEventValueChanged];

Now create a method - (void)sliderChanged:(id)sender. It should get the slider's value with slider.value, determine where to scroll your scroll view (a CGRect that should be visible) to and then [scrollView scrollRectToVisible:animated:]