UISlider

这个值是介于滑块的最大值和最小值之间的，如果没有设置边界值，默认为0-1；
@property(nonatomic) float value; 

设置滑块最小边界值（默认为0）
@property(nonatomic) float minimumValue;  

设置滑块最大边界值（默认为1）
@property(nonatomic) float maximumValue;

设置滑块最左端显示的图片：
@property(nonatomic,retain) UIImage *minimumValueImage；

设置滑块最右端显示的图片：
@property(nonatomic,retain) UIImage *maximumValueImage;

设置滑块值是否连续变化(默认为YES),这个属性设置为YES则在滑动时，其value就会随时变化，设置为NO，则当滑动结束时，value才会改变。
@property(nonatomic,getter=isContinuous) BOOL continuous; 

设置滑块左边（小于部分）线条的颜色
@property(nonatomic,retain) UIColor *minimumTrackTintColor；

设置滑块右边（大于部分）线条的颜色
@property(nonatomic,retain) UIColor *maximumTrackTintColor；

设置滑块颜色（影响已划过一端的颜色）
注意这个属性：如果你没有设置滑块的图片，那个这个属性将只会改变已划过一段线条的颜色，不会改变滑块的颜色，如果你设置了滑块的图片，又设置了这个属性，那么滑块的图片将不显示，滑块的颜色会改变（IOS7）
@property(nonatomic,retain) UIColor *thumbTintColor；

手动设置滑块的值：
- (void)setValue:(float)value animated:(BOOL)animated;

设置滑块的图片：
- (void)setThumbImage:(UIImage *)image forState:(UIControlState)state;

设置滑块划过部分的线条图案
- (void)setMinimumTrackImage:(UIImage *)image forState:(UIControlState)state;

设置滑块未划过部分的线条图案
- (void)setMaximumTrackImage:(UIImage *)image forState:(UIControlState)state;

对应的几个get方法
- (UIImage *)thumbImageForState:(UIControlState)state;
- (UIImage *)minimumTrackImageForState:(UIControlState)state;
- (UIImage *)maximumTrackImageForState:(UIControlState)state;

对应的设置当前状态的响应属性的方法
@property(nonatomic,readonly) UIImage *currentThumbImage;
@property(nonatomic,readonly) UIImage *currentMinimumTrackImage;
@property(nonatomic,readonly) UIImage *currentMaximumTrackImage;

添加触发事件
[slider addTarget:self action:@selector(log:) forControlEvents:UIControlEventValueChanged];

#import "ViewController.h"

@interface ViewController ()

@property (nonatomic,strong) UISlider *slider;
@property (nonatomic,strong) UILabel *label;

@end

@implementation ViewController

- (void)viewDidLoad {
    [super viewDidLoad];
    
    [self.view addSubview:self.slider];
    [self.view addSubview:self.label];
}

- (UILabel *)label {
    if (!_label) {
        _label = [[UILabel alloc] init];
        _label.adjustsFontSizeToFitWidth = YES;
        _label.textAlignment = NSTextAlignmentCenter;
        _label.frame = CGRectMake(0, 300, [UIScreen mainScreen].bounds.size.width, 30);
        _label.textColor = [UIColor colorWithRed:49.0/255.0 green:186.0/255.0 blue:81.0/255.0 alpha:1];
        _label.font = [UIFont fontWithName:@"Futura-Medium" size:17];
        _label.text = @"Futura-Medium";
    }
    return _label;
}

- (UISlider *)slider {
    if (!_slider) {
        _slider = [[UISlider alloc] init];
        _slider.frame = CGRectMake(50, 360, [UIScreen mainScreen].bounds.size.width - 100, 20);
        // 最小 最大 值
        _slider.minimumValue = 0.0f;
        _slider.maximumValue = 100.0f;
        // 当前值
        _slider.value = 50.0f;
        // 连续
        _slider.continuous = YES;
        // valueImage
        _slider.minimumValueImage = [UIImage imageNamed:@"min_value"];
        _slider.maximumValueImage = [UIImage imageNamed:@"max_value"];
        // 颜色
        _slider.minimumTrackTintColor = [UIColor purpleColor];
        _slider.maximumTrackTintColor = [UIColor redColor];
        _slider.thumbTintColor = [UIColor blueColor];
        [_slider addTarget:self action:@selector(sliderValueChanged:) forControlEvents:UIControlEventValueChanged];
    }
    return _slider;
}

- (void)sliderValueChanged:(id)sender {
    self.label.text = [NSString stringWithFormat:@"%d",(int)self.slider.value];
}

@end