ViewController.m

#import <QuartzCore/QuartzCore.h>

static long long __color1 = 0x2ACE46;
static long long __color2 = 0x34AADC;



@interface MViewController ()
@property (nonatomic,strong) CALayer *layerColor;
@property (nonatomic,strong) UIColor *color1;
@property (nonatomic,strong) UIColor *color2;

@property (nonatomic,strong) UIButton *btn1;
@property (nonatomic,strong) UIButton *btn2;

@end

@implementation SKViewController

- (void)viewDidLoad
{
    [super viewDidLoad];
    
    CGRect btn1Frame = CGRectMake(10.0, CGRectGetMidY(self.view.bounds), 100.0, 40.0);
    CGRect btn2Frame = CGRectMake(150.0, CGRectGetMidY(self.view.bounds), 100.0, 40.0);
    
    self.color1 = UIColorFromRGB(__color1);
    self.color2 = UIColorFromRGB(__color2);
    
    self.btn1 = [UIButton buttonWithType:UIButtonTypeCustom];
    self.btn1.frame = btn1Frame;
    self.btn1.backgroundColor = self.color1;
    [self.btn1 addTarget:self action:@selector(moveLayer:) forControlEvents:UIControlEventTouchUpInside];
    
    self.btn2 = [UIButton buttonWithType:UIButtonTypeCustom];
    self.btn2.frame = btn2Frame;
    self.btn2.backgroundColor = self.color2;
    [self.btn2 addTarget:self action:@selector(moveLayer:) forControlEvents:UIControlEventTouchUpInside];
    
    self.layerColor = [CALayer layer];
    self.layerColor.frame = CGRectMake(10.0, CGRectGetMidY(btn1Frame) + 53.0,100.0,3.0);
    self.layerColor.backgroundColor = self.color1.CGColor;
    
    
    [self.view addSubview:self.btn1];
    [self.view addSubview:self.btn2];
    [self.view.layer addSublayer:self.layerColor];
    // Do any additional setup after loading the view, typically from a nib.
}

- (void)moveLayer:(UIButton *)sender
{
    CGPoint toPoint = {.x = sender.frame.origin.x, .y = self.layerColor.frame.origin.y};
    
    CABasicAnimation *animation = [CABasicAnimation animationWithKeyPath:@"position"];
    animation.fromValue = [NSValue valueWithCGPoint:self.layerColor.frame.origin];
    animation.toValue = [NSValue valueWithCGPoint:toPoint];
    animation.duration = 0.3;
    animation.removedOnCompletion = NO;
    animation.fillMode = kCAFillModeForwards;

    
    [self.layerColor addAnimation:animation forKey:@"position"];

}

@end