iOS

[self.view addSubview:self.rullerView];
-(DYScrollRulerView *)rullerView{
    if (!_rullerView) {
        NSString *unitStr = @"￥";
        CGFloat rullerHeight = [DYScrollRulerView rulerViewHeight];
        _rullerView = [[DYScrollRulerView alloc]initWithFrame:CGRectMake(5, ScreenHeight/5.0, ScreenWidth-20, rullerHeight) theMinValue:0 theMaxValue:1000 theStep:10 theUnit:unitStr theNum:10];
        [_rullerView setDefaultValue:500 animated:YES];
        _rullerView.bgColor = [UIColor lightGrayColor];
        _rullerView.triangleColor   = [UIColor redColor];
        _rullerView.delegate        = self;
        _rullerView.scrollByHand    = YES;
    }
    return _rullerView;
}

	//滑动尺子时产生的回调


#pragma mark - YKScrollRulerDelegate
-(void)dyScrollRulerView:(DYScrollRulerView *)rulerView valueChange:(float)value{

    NSLog(@"value->%.f",value);
}

出处：https://github.com/DanielYK/ScrollRuler

感谢作者！！！