etolstoy

- (void)showMenu
{
    CALayer* layer = _menuButtonImageView.layer;
    CABasicAnimation *animation = [CABasicAnimation animationWithKeyPath:@"transform.rotation.z"];
    
    animation.fromValue = [NSNumber numberWithFloat:0.0 * M_PI];
    animation.toValue = [NSNumber numberWithFloat:1.0 * M_PI];
    
    animation.duration = 0.3;
    animation.cumulative = YES;

etolstoy

#import "CERangeSlider.h"

etolstoy

@implementation CEViewController
{
    CERangeSlider* _rangeSlider;
}

etolstoy

- (void)viewDidLoad
{
    [super viewDidLoad];
 
    // Do any additional setup after loading the view, typically from a nib.
 
    NSUInteger margin = 20;
    CGRect sliderFrame = CGRectMake(margin, margin, self.view.frame.size.width - margin * 2, 30);
    _rangeSlider = [[CERangeSlider alloc] initWithFrame:sliderFrame];
    _rangeSlider.backgroundColor = [UIColor redColor];

etolstoy

@property (nonatomic) float maximumValue;
@property (nonatomic) float minimumValue;
@property (nonatomic) float upperValue;
@property (nonatomic) float lowerValue;

etolstoy

- (id)initWithFrame:(CGRect)frame
{
    self = [super initWithFrame:frame];
    if (self) {
        // Initialization code
        _maximumValue = 10.0;
        _minimumValue = 0.0;
        _upperValue = 8.0;
        _lowerValue = 2.0;
    }

etolstoy

#import <QuartzCore/QuartzCore.h>

etolstoy

@implementation CERangeSlider
{
    CALayer* _trackLayer;
    CALayer* _upperKnobLayer;
    CALayer* _lowerKnobLayer;
 
    float _knobWidth;
    float _useableTrackLength;
}

etolstoy

_trackLayer = [CALayer layer];
_trackLayer.backgroundColor = [UIColor blueColor].CGColor;
[self.layer addSublayer:_trackLayer];
 
_upperKnobLayer = [CALayer layer];
_upperKnobLayer.backgroundColor = [UIColor greenColor].CGColor;
[self.layer addSublayer:_upperKnobLayer];
 
_lowerKnobLayer = [CALayer layer];
_lowerKnobLayer.backgroundColor = [UIColor greenColor].CGColor;

etolstoy

- (void) setLayerFrames
{
    _trackLayer.frame = CGRectInset(self.bounds, 0, self.bounds.size.height / 3.5);
    [_trackLayer setNeedsDisplay];
 
    _knobWidth = self.bounds.size.height;
    _useableTrackLength = self.bounds.size.width - _knobWidth;
 
    float upperKnobCentre = [self positionForValue:_upperValue];
    _upperKnobLayer.frame = CGRectMake(upperKnobCentre - _knobWidth / 2, 0, _knobWidth, _knobWidth);