iOS实现双向滑动条效果

#import <UIKit/UIKit.h>typedef NSString* (^HLDoubleSlideViewSwitchStrBock)(CGFloat count);@interface HLDoubleSlideView : UIView@property(nonatomic,assign)CGFloat maxValue;@property(nonatomic,assign)CGFloat minValue;@property(nonatomic,assign)CGFloat currentLeftValue;@property(nonatomic,assign)CGFloat currentRightValue;//格式化显示文本@property(nonatomic,copy)HLDoubleSlideViewSwitchStrBock block;@end

#import "HLDoubleSlideView.h"#import "UIView+Add.h"@interface HLDoubleSlideView ()<UIGestureRecognizerDelegate>@property(nonatomic,strong)UIImageView *leftImageView;@property(nonatomic,strong)UIImageView *rightImageView;@property(nonatomic,strong)UILabel *leftLabel;@property(nonatomic,strong)UILabel *rightLabel;@property(nonatomic,strong)UIButton *leftBtn;@property(nonatomic,strong)UIButton *rightBtn;@property(nonatomic,assign)CGFloat leftBtnOrgx;@property(nonatomic,assign)CGFloat rightBtnOrgx;@end@implementation HLDoubleSlideView-(id)init{ if (self = [super init]) {  [self setupUI]; } return self;}-(void)setupUI{ _leftImageView = [[UIImageView alloc] init]; _leftImageView.image = [UIImage imageNamed:@"progressImage"]; _leftImageView.frame = CGRectMake(0, 5, 60, 40); [self addSubview:_leftImageView]; _leftLabel = [[UILabel alloc] initWithFrame:_leftImageView.bounds]; _leftLabel.backgroundColor = [UIColor clearColor]; _leftLabel.font = [UIFont systemFontOfSize:13]; _leftLabel.textAlignment = NSTextAlignmentCenter; _leftLabel.textColor = [UIColor whiteColor]; [_leftImageView addSubview:_leftLabel]; _rightImageView = [[UIImageView alloc] init]; _rightImageView.image = [UIImage imageNamed:@"progressImage"]; _rightImageView.frame = CGRectMake(0, 5, 60, 40); [self addSubview:_rightImageView]; _rightLabel = [[UILabel alloc] initWithFrame:_rightImageView.bounds]; _rightLabel.backgroundColor = [UIColor clearColor]; _rightLabel.font = [UIFont systemFontOfSize:13]; _rightLabel.textAlignment = NSTextAlignmentCenter; _rightLabel.textColor = [UIColor whiteColor]; [_rightImageView addSubview:_rightLabel]; _leftBtn = [UIButton buttonWithType:UIButtonTypeCustom]; _leftBtn.frame = CGRectMake(0, 50, 20,20); _leftBtn.backgroundColor = [UIColor blueColor]; _leftBtn.layer.cornerRadius = 10; [self addSubview:_leftBtn]; UIPanGestureRecognizer *panGesture = [[UIPanGestureRecognizer alloc] initWithTarget:self action:@selector(tapGestureAction:)]; panGesture.delegate = self; [_leftBtn addGestureRecognizer:panGesture]; _leftImageView.centerX = _leftBtn.centerX; _rightBtn = [UIButton buttonWithType:UIButtonTypeCustom]; _rightBtn.backgroundColor = [UIColor blueColor]; _rightBtn.frame = CGRectMake(240, 50, 20, 20); _rightBtn.layer.cornerRadius = 10; panGesture = [[UIPanGestureRecognizer alloc] initWithTarget:self action:@selector(tapGestureAction:)]; panGesture.delegate = self; [_rightBtn addGestureRecognizer:panGesture]; _rightImageView.centerX = _rightBtn.centerX; [self addSubview:_rightBtn];}- (BOOL)gestureRecognizerShouldBegin:(UIGestureRecognizer *)gestureRecognizer{ return YES;}-(UIView*)hitTest:(CGPoint)point withEvent:(UIEvent *)event{ NSLog(@"doubleView hitTest"); return [super hitTest:point withEvent:event];}-(void)touchesBegan:(NSSet<UITouch *> *)touches withEvent:(UIEvent *)event{ NSLog(@"began"); [super touchesBegan:touches withEvent:event];}-(void)touchesMoved:(NSSet<UITouch *> *)touches withEvent:(UIEvent *)event{ NSLog(@"move"); [super touchesMoved:touches withEvent:event];}-(void)layoutSubviews{ CGFloat centenX = (_currentLeftValue - _minValue) * (self.bounds.size.width - 20)/(_maxValue - _minValue) + 10; _leftBtn.centerX = centenX; if (_currentLeftValue != 0) {  CGFloat centenX = (_currentRightValue - _minValue) * (self.bounds.size.width - 20) / (_maxValue - _minValue) + 10;  _rightBtn.centerX = centenX; } else {  _rightBtn.centerX = self.bounds.size.width - 10; } _leftImageView.centerX = _leftBtn.centerX; _rightImageView.centerX = _rightBtn.centerX; if (_block) {  _leftLabel.text = _block(_currentLeftValue);  _rightLabel.text = _block(_currentRightValue); }}-(void)tapGestureAction:(UIPanGestureRecognizer*)panGesture{ UIView *vw = panGesture.view; CGPoint transPoint = [panGesture translationInView:self]; NSLog(@"x:%lf,y:%lf",transPoint.x,transPoint.y); switch (panGesture.state) {  case UIGestureRecognizerStateBegan:  {   if ([vw isEqual:_leftBtn])   {    _leftBtnOrgx = _leftBtn.orgX;    NSLog(@"拖拽左边按钮");   }   else if([vw isEqual:_rightBtn])   {    _rightBtnOrgx = _rightBtn.orgX;    NSLog(@"拖拽右边按钮");   }  }   break;  case UIGestureRecognizerStateChanged:  {   if ([vw isEqual:_leftBtn])   {    CGFloat orginX = _leftBtn.orgX;    _leftBtn.orgX = _leftBtnOrgx + transPoint.x;    if (_leftBtn.orgX < 0) {     _leftBtn.orgX = 0;    }    else if(_leftBtn.orgX >= _rightBtn.orgX - 20)    {     _leftBtn.orgX = orginX;    }     _leftImageView.centerX = _leftBtn.centerX;   }   else if([vw isEqual:_rightBtn])   {    CGFloat orginX = _rightBtn.orgX;    _rightBtn.orgX = _rightBtnOrgx + transPoint.x;    if (_rightBtn.orgX >= self.bounds.size.width - 20) {     _rightBtn.orgX = self.bounds.size.width - 20;    }    else if(_rightBtn.orgX <= _leftBtn.orgX + 20)    {     _rightBtn.orgX = orginX;    }     _rightImageView.centerX = _rightBtn.centerX;   }  }   break;  case UIGestureRecognizerStateEnded:  {  }   break;  default:   break; } _currentLeftValue = _minValue + (_maxValue - _minValue) * ((_leftBtn.centerX - 10) / (self.bounds.size.width - 20)); _currentRightValue = _minValue + (_maxValue - _minValue) * ((_rightBtn.centerX - 10) / (self.bounds.size.width - 20)); if (_block) {  _leftLabel.text = _block(_currentLeftValue);  _rightLabel.text = _block(_currentRightValue); } NSLog(@"leftValue:%lf,rightValue:%lf",_currentLeftValue,_currentRightValue); [self setNeedsDisplay];}-(void)setCurrentLeftValue:(CGFloat)currentLeftValue{ _currentLeftValue = currentLeftValue; CGFloat centenX = (currentLeftValue - _minValue) * (self.bounds.size.width - 20)/(_maxValue - _minValue) + 10; _leftBtn.centerX = centenX; [self setNeedsDisplay];}-(void)setCurrentRightValue:(CGFloat)currentRightValue{ _currentRightValue = currentRightValue; CGFloat centenX = (_currentRightValue - _minValue) * (self.bounds.size.width - 20) / (_maxValue - _minValue) + 10; _rightBtn.centerX = centenX; [self setNeedsDisplay];}-(void)drawRect:(CGRect)rect{ CGContextRef context = UIGraphicsGetCurrentContext(); CGContextSetLineCap(context, kCGLineCapRound); CGContextSetLineWidth(context, 3); [[UIColor grayColor] setStroke]; CGContextMoveToPoint(context, 0, 60); CGContextAddLineToPoint(context, self.bounds.size.width, 60); CGContextStrokePath(context); [[UIColor redColor] setStroke]; CGContextMoveToPoint(context, _leftBtn.orgX + 10, 60); CGContextAddLineToPoint(context, _rightBtn.orgX,60); CGContextStrokePath(context);}@end

 HLDoubleSlideView *doubleSlideView = [[HLDoubleSlideView alloc] init]; doubleSlideView.backgroundColor = [UIColor whiteColor];//HLColor(244, 244, 244); doubleSlideView.minValue = 1000; doubleSlideView.maxValue = 10000; doubleSlideView.block = ^NSString*(CGFloat count) {  return [NSString stringWithFormat:@"%.0f元",count]; }; [self.view addSubview:doubleSlideView]; doubleSlideView.frame = CGRectMake(60, 64, 250, 80); doubleSlideView.currentLeftValue = 1200; doubleSlideView.currentRightValue = 10000;