MBSliderView is an iOS control that looks like 'Slide to unlock' slider.
It's really easy to implement and fully customizable.
It can be loaded from a nib file (You can use Interface Builder). The slider thumb is drawn with CoreGraphics so you could change the color as you like.
You also can set the label color :P

1. Add a MBSliderView variable and the delegate protocol to your controller :

    @interface ViewController : UIViewController <MBSliderViewDelegate>{
    	// IBOutlet is just for Interface Builder
    	IBOutlet MBSliderView *slider;
    }
   

2. Create an UIView in Interface Builder and change the class to MBSliderView,
   then link it to the IBOutlet you just created at step 1 and the delegate to the controller :

3. Implement the delegate method in the controller :

    // MBSliderViewDelegate
    - (void) sliderDidSlide:(MBSliderView *)slideView {
    	// Customization example
    	// Just do whatever you want
    	[slideView setThumbColor:[self randomColor]];
    	[slideView setLabelColor:[self randomColor]];
    }
   

1. Add the delegate protocol to your controller :

    @interface ViewController : UIViewController <MBSliderViewDelegate>
   

2. Create the MBSliderView and add it to the conroller view :

    MBSliderView *slider = [[MBSliderView alloc] initWithFrame:CGRectMake(20.0, 20.0, self.view.frame.size.width-40.0, 44.0)];
    [slider setText:@"Slide to something"]; // set the label text
    //[s1 setThumbColor:[UIColor blueColor]; // set custom thumb color
    //[s1 setLabelColor:[UIColor yellowColor]]; // set custom label color
    [slider setDelegate:self]; // set the MBSliderView delegate
    [self.view addSubview:slider];
    [slider release];
   

3. Implement the delegate method in the controller :

    // MBSliderViewDelegate
    - (void) sliderDidSlide:(MBSliderView *)slideView {
    	// Customization example
    	// Just do whatever you want
    	[slideView setThumbColor:[self randomColor]];
    	[slideView setLabelColor:[self randomColor]];
    }
   

With some randoms colors

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