一直在用荷包这App,感觉这个App整体真的不错,一直想做一个滑块,无意中看到这个,今天有时间就做了一个小Demo ,话不多说,上图片。。。。

效果图

EA680F65C7FE37C7036D814398DFBC5A.jpg

效果图

2.gif

部分代码 自定义的CustomSlider.H

/** 回调 */
@property (nonatomic,copy)changeValueBlock block;
/**
 初始化
 @param frame       位置
 @param defaultIndx 默认选中那个点
 */
- (instancetype)initWithFrame:(CGRect)frame WithDefaultIndx:(CGFloat)defaultIndx WithDefaultPicName:(NSString *)PicNameStr;

部分代码 自定义的CustomSlider.M

- (instancetype)initWithFrame:(CGRect)frame WithDefaultIndx:(CGFloat)defaultIndx WithDefaultPicName:(NSString *)PicNameStr
{
    if (self = [super initWithFrame:frame  ]) {
        picName = PicNameStr;
        [self setUpSubViews];
        self.defaultIndx=defaultIndx;
    }
    return self;
}
#pragma mark  ====================== 创建子控件 ======================
- (void)setUpSubViews
{
    UILabel * bgLabel = [[UILabel alloc]initWithFrame:CGRectMake(0, CustomHeight/2,CustomWidth , 2)];
    bgLabel.backgroundColor = [UIColor orangeColor];
    bgLabel.userInteractionEnabled = YES;
    CGFloat smallLableWidth = PointWidth;
    for (int i =0; i< PointNum; i++) {
        UILabel * smallPoitLabel = [[UILabel alloc]initWithFrame:CGRectMake(0, 0,8, 8)];
        smallPoitLabel.center = CGPointMake(DistanceWidth + (smallLableWidth * i) , 1);
        smallPoitLabel.layer.cornerRadius = 4;
        smallPoitLabel.clipsToBounds = YES;
        smallPoitLabel.backgroundColor =[UIColor orangeColor];
        [bgLabel addSubview:smallPoitLabel];
    }
    [self addSubview:bgLabel];
    //图片
    UIImageView * sliderImageView = [[UIImageView alloc]initWithFrame:CGRectMake(0, CustomHeight/2 +1, 40, 40)];
    sliderImageView.image = [UIImage imageNamed:picName];
    [self addSubview:sliderImageView];
    self.sliderImageView = sliderImageView;
}

-(void)setDefaultIndx:(CGFloat)defaultIndx{
     CGFloat withPress=defaultIndx/(PointNum -1);
    //设置默认位置
    self.sliderImageView.center  = CGPointMake(DistanceWidth + (PointWidth)*(defaultIndx -1), CustomHeight/2 +1);
     _pointX=withPress*PointWidth;
    _sectionIndex=defaultIndx;
}

-(BOOL)beginTrackingWithTouch:(UITouch *)touch withEvent:(UIEvent *)event{
    [self changePointX:touch];
    _pointX=_sectionIndex*(PointWidth) + DistanceWidth;
    [self refreshSliderFrame];
    return YES;
}
- (BOOL)continueTrackingWithTouch:(UITouch *)touch withEvent:(UIEvent *)event{
   [self changePointX:touch];
   [self refreshSliderFrame];
   [self sendActionsForControlEvents:UIControlEventValueChanged];
    return YES;
}
-(void)endTrackingWithTouch:(UITouch *)touch withEvent:(UIEvent *)event{
   [self changePointX:touch];
   _pointX=_sectionIndex*(PointWidth) + DistanceWidth;
    if (self.block) {
        self.block((int)_sectionIndex);
    }
    [self refreshSliderFrame];
}
-(void)changePointX:(UITouch *)touch{
    CGPoint point = [touch locationInView:self];
    _pointX=point.x;
    if (point.xCustomWidth - DistanceWidth ){
        _pointX=CustomWidth  - DistanceWidth;
    }
    //四舍五入
    double pX = (int)_pointX;
    double pY = (int)PointWidth;
    _sectionIndex= round(pX / pY);
}
-(void)refreshSliderFrame{
    [UIView animateWithDuration:0.5 animations:^{
        self.sliderImageView.center=CGPointMake(_pointX, CustomHeight/2 + 1);
    }];
}

部分代码 控制器

CustomSlider * customSlider = [[CustomSlider alloc]initWithFrame:CGRectMake(20, 100,[UIScreen mainScreen].bounds.size.width-40 , 100) WithDefaultIndx:2 WithDefaultPicName:@"4"];
    customSlider.backgroundColor = [UIColor clearColor];
     customSlider.block = ^(int index){
        //做自己想做的事情
         NSLog(@"当前index-->>>==%d",index);
    };
    [self.view addSubview:customSlider];

来自：http://www.jianshu.com/p/44cce6d646ca

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