UISlider

一、简介
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<<继承关系：UISlider-->UIControl-->UIView-->UIResponder-->NSObject

格式为

1-->设置当前值（作用）

slider.value = 50; （这是具体的例子）

@property(nonatomic) float value; // 默认是 0.0.这个值将被固定在min/max上。（这是说明）

二、UISlider的属性(属性的顺序与苹果API一致)

1--> 设置当前值

slider.value = 50;

@property(nonatomic) float value; // 默认是 0.0.这个值将被固定在min/max上。

2-->设置最小值

slider.minimumValue = 0.0;

@property(nonatomic) float minimumValue; // 当值可以改变时，滑块可以滑动到最小位置的值，默认为0.0

3-->设置最大值

slider. maximumValue = 100;

@property(nonatomic) float maximumValue; // 当值可以改变时，滑块可以滑动到最大位置的值，默认为1.0

4-->设置最小值一端图片，会挤压滑动条宽度

slider.minimumValueImage = [UIImage imageNamed:@"001.jpeg"];

@property(nullable, nonatomic,strong) UIImage *minimumValueImage; //滑块条最小值处设置的图片，默认为nil
5-->设置最大值一端图片，会挤压滑动条宽度

slider.maximumValueImage=[UIImage imageNamed:@"2.png"];

@property(nullable, nonatomic,strong) UIImage *maximumValueImage; //滑块条最大值处设置的图片，默认为nil
6--> 设置是否可连续变化

[slider setContinuous:YES];

@property(nonatomic,getter=isContinuous) BOOL continuous; // 默认值为YES设置为YES只要滑轮滚动就会触发change方法设置为NO只有当滑轮停止移动时才会触发change方法

7-->设置已经滑过一端滑动条颜色

slider.minimumTrackTintColor=[UIColor redColor];

@property(nullable, nonatomic,strong) UIColor *minimumTrackTintColor//小于滑块当前值滑块条的颜色，默认为蓝色
8-->设置未滑过一端滑动条颜色

slider.maximumTrackTintColor=[UIColor blackColor];

@property(nullable, nonatomic,strong) UIColor *maximumTrackTintColor//大于滑块当前值滑块条的颜色，默认为白色
9-->设置滑块颜色

slider.thumbTintColor=[UIColor yellowColor];

@property(nullable, nonatomic,strong) UIColor *thumbTintColor// 当前滑块的颜色，默认为白色

10-->设置slider的值

[slider setValue:3 animated:YES];

• (void)setValue:(float)value animated:(BOOL)animated;
  11-->设置滑块图片背景

[sli1 setThumbImage:[UIImage imageNamed:@"1.png"] forState:UIControlStateNormal];

• (void)setThumbImage:(nullable UIImage *)image forState:(UIControlState)state;
  12-->设置已经滑过一端滑动条背景图片，会覆盖之前设置的颜色

 [sli1 setMinimumTrackImage:[UIImage imageNamed:@"3.png"] forState:UIControlStateNormal];  

• (void)setMinimumTrackImage:(nullable UIImage *)image forState:(UIControlState)state;

13-->设置未滑过一端滑动条背景图片

[sli1 setMaximumTrackImage:[UIImage imageNamed:@"logo.png"] forState:UIControlStateNormal];

• (void)setMaximumTrackImage:(nullable UIImage *)image forState:(UIControlState)state;
  14-->获取滑块的图片

UIImage *image=[slider thumbImageForState:UIControlStateNormal];

-(nullable UIImage *)thumbImageForState:(UIControlState)state;
15-->获取滑块划过部分的线条图案

UIImage *image=[slider minimumTrackImageForState:UIControlStateNormal];

-(nullable UIImage *)minimumTrackImageForState:(UIControlState)state;
16-->获取滑块未划过部分的线条图案

UIImage *image=[slider maximumTrackImageForState:UIControlStateNormal];

• (nullable UIImage *)maximumTrackImageForState:(UIControlState)state;
  17-->获取当前滑块的图片

UIImage *image=[slider currentThumbImage];

@property(nullable,nonatomic,readonly) UIImage *currentThumbImage;
18-->获取滑块条最小值处设置的图片

UIImage *image=[slider currentMinimumTrackImage];

@property(nullable,nonatomic,readonly) UIImage *currentMinimumTrackImage;

19--> 滑块条最大值处设置的图片

UIImage *image=[slider currentMaximumTrackImage];

@property(nullable,nonatomic,readonly) UIImage *currentMaximumTrackImage;

20-->设置滑块最小值

• (CGRect)minimumValueImageRectForBounds:(CGRect)bounds
  {
  return CGRectMake(0, 0, CGRectGetWidth(self.frame), CGRectGetHeight(self.frame));
  }

-(CGRect)minimumValueImageRectForBounds:(CGRect)bounds;

21-->设置滑块最大值

-(CGRect)maximumValueImageRectForBounds:(CGRect)bounds
{
return CGRectMake(0, 0, CGRectGetWidth(self.frame)/ 2, CGRectGetHeight(self.frame) / 2);
}

-(CGRect)maximumValueImageRectForBounds:(CGRect)bounds;
22-->控制slider的宽和高，这个方法才是真正的改变slider滑道的高的

-(CGRect)trackRectForBounds:(CGRect)bounds
{
return CGRectMake(0, 0, CGRectGetWidth(self.frame), CGRectGetHeight(self.frame));
}

-(CGRect)trackRectForBounds:(CGRect)bounds;

23-->改变滑块的触摸范围

-(CGRect)thumbRectForBounds:(CGRect)bounds trackRect:(CGRect)rect value:(float)value

{
return CGRectInset([super thumbRectForBounds:bounds trackRect:rect value:value], 10, 10);
}

-(CGRect)thumbRectForBounds:(CGRect)bounds trackRect:(CGRect)rect value:(float)value;
备注：slider上的那个滑动的圆圈的大小是没有办法进行改变的，并且，重写这四个方法，可以改变，没有办法把圆圈滑到两端的问题