Changing UIAccelerometer's updateInterval via a UISlider - objective-c

Question

I'm trying to change my UIAcceleromter's updateInterval via a UISlider that I have in my .xib. My NSLogs shows me the values perfectly, but the acceleromter's interval does not increase in speed when I move the slider. I'm not sure what's wrong.
I appreciate any help offered. Here is my code:
ViewController.h:
#import <UIKit/UIKit.h>
#interface ViewController : UIViewController <UIAccelerometerDelegate> {
}
- (IBAction)sliderValueChanged:(UISlider *)slider;
#end
ViewController.m:
#import "ViewController.h"
#interface ViewController ()
#end
#implementation ViewController
#synthesize XAxis, YAxis, delta;
float value;
- (void)viewWillAppear:(BOOL)animated
{
UIAccelerometer *accel = [UIAccelerometer sharedAccelerometer];
accel.delegate = self;
accel.updateInterval = 1.0f * value;
NSLog(#"Value: %f",value);
}
- (void)viewDidLoad
{
[super viewDidLoad];
}
- (void)accelerometer:(UIAccelerometer *)accelerometer didAccelerate:(UIAcceleration *)acceleration
{
NSLog(#"X: %g",acceleration.x);
NSLog(#"Y: %g",acceleration.y);
NSLog(#"Z: %g",acceleration.z);
}
- (IBAction) sliderValueChanged:(UISlider *)slider
{
value = slider.value;
NSLog(#"Value: %f",slider.value);
}
- (void)viewDidUnload
{
[super viewDidUnload];
// Release any retained subviews of the main view.
}
#end

Answer 1

There isn't a line of code that changes you accelerometer's update interval. All you are doing is remembering the value of the slider in a float and outputting it via NSLog.
The accelerometers value is only being set when your view appears.
You need to store the accelerometer as a property of your object and do something like
self.accelerometer.updateInterval = value;
in your sliderValueChanged: method.