How do we change the iPhone lighting through UISlider?

[guilherme]

How to change the iPhone illumination by UISlider?

[Bogopo]

Create a slider:

UISlider *slider = [[UISlider alloc] initWithFrame:CGRectMake(0, 100, 320, 100)];
[slider addTarget:self action:@selector(changeBrightness:) forControlEvents:UIControlEventValueChanged];
[self.view addSubview:slider];
slider.value = [UIScreen mainScreen].brightness; //начальное значение

Modify the

- (void)changeBrightness:(UISlider*)sender
{
    [UIScreen mainScreen].brightness = sender.value;
}

It only works on the device, not the simulator.