.h文件

#import <UIKit/UIKit.h>
/**滑杆*/
@interface YJL_Slider : UISlider
@property(nonatomic , assign) CGFloat sliderHight;  //滑条的高度
//初始化方法
-(instancetype)initWithFrame:(CGRect)frame andSliderHight:(CGFloat)sliderHight;
@end

.m文件

#import "YJL_Slider.h"
#define thumbBound_x 10
#define thumbBound_y 20

@implementation YJL_Slider
{
      CGRect lastBounds;
}
-(instancetype)initWithFrame:(CGRect)frame andSliderHight:(CGFloat)sliderHight{
       if (self = [super initWithFrame:frame]) {
               _sliderHight = sliderHight;
       }
       return self;
}
-(instancetype)init{
       if (self = [super init]) {
          //
       }
        return self;
 }


 -(CGRect)trackRectForBounds:(CGRect)bounds{
           if (_sliderHight == 0.00) {
                   _sliderHight = 4;
            }
             return CGRectMake(0, 0, self.frame.size.width, _sliderHight);
   }


  //- (CGRect)thumbRectForBounds:(CGRect)bounds trackRect:(CGRect)rect value:(float)value{
  //        //y轴方向改变手势范围
  //        rect.origin.y = rect.origin.y - 10;
  //        rect.size.height = rect.size.height + 20;
  //        //
  //        rect.origin.x = rect.origin.x - 10;
  //        rect.size.width = rect.size.width + 20;
  //        return CGRectInset ([super thumbRectForBounds:bounds trackRect:rect value:value], 10 ,10);
  //}

  - (CGRect)thumbRectForBounds:(CGRect)bounds trackRect:(CGRect)rect value:(float)value{
          rect.origin.x = rect.origin.x;
          rect.size.width = rect.size.width ;
          CGRect result = [super thumbRectForBounds:bounds trackRect:rect value:value];
           lastBounds = result;
           return result;
 }

 //滑杆上的点击事件
- (UIView *)hitTest:(CGPoint)point withEvent:(UIEvent *)event{
       UIView *result = [super hitTest:point withEvent:event];
       if ((point.y >= -thumbBound_y) && (point.y < lastBounds.size.height + thumbBound_y)) {
           float value = 0.0;
          value = point.x - self.bounds.origin.x;
          value = value/self.bounds.size.width;
          value = value < 0? 0 : value;
          value = value > 1? 1: value;
          value = value * (self.maximumValue - self.minimumValue) + self.minimumValue;
          [self setValue:value animated:YES];
      }
      return result;

}

//扩大触摸点的响应范围
- (BOOL)pointInside:(CGPoint)point withEvent:(UIEvent *)event{
     BOOL result = [super pointInside:point withEvent:event];
    if (!result && point.y > -10) {
           if ((point.x >= lastBounds.origin.x - thumbBound_x) && (point.x <= (lastBounds.origin.x + lastBounds.size.width + thumbBound_x)) && (point.y < (lastBounds.size.height + thumbBound_y))) {
           result = YES;
           }
    }
     return result;
}
@end