UISlider基本使用
作者:互联网
UISlider是一个很常用的UI控件,调节屏幕亮度或者调节音量大小等很多地方都可以用到,而且使用方便,下面我来介绍一下UISlider的基本使用。
首先介绍一下基本属性和常用方法:
//设置当前slider的值,默认为0.0 @property(nonatomic) float value; //设置slider的最小值 @property(nonatomic) float minimumValue; //设置slider的最大值 @property(nonatomic) float maximumValue; //设置滑块左边的图片 @property(nullable, nonatomic,strong) UIImage *minimumValueImage; //设置滑块右边的图片 @property(nullable, nonatomic,strong) UIImage *maximumValueImage; //设置已完成部分轨道颜色 @property(nullable, nonatomic,strong) UIColor *minimumTrackTintColor; //设置未完成部分轨道颜色 @property(nullable, nonatomic,strong) UIColor *maximumTrackTintColor; //设置滑块颜色 @property(nullable, nonatomic,strong) UIColor *thumbTintColor; //设置slider的值 - (void)setValue:(float)value animated:(BOOL)animated; //设置不同状态下滑块的图片 - (void)setThumbImage:(nullable UIImage *)image forState:(UIControlState)state; //设置不同状态下滑动条左侧的图片 - (void)setMinimumTrackImage:(nullable UIImage *)image forState:(UIControlState)state; //设置不同状态下滑动条右侧的图片 - (void)setMaximumTrackImage:(nullable UIImage *)image forState:(UIControlState)state;
下面来看一个完整示例,通过滑动条来调整图片的透明度
#import "ViewController.h" @interface ViewController () @property(nonatomic,strong)UISlider *slider; @property(nonatomic,strong)UIImageView *imageView; @end @implementation ViewController - (void)viewDidLoad { [super viewDidLoad]; [self.view addSubview:self.imageView]; [self.view addSubview:self.slider]; } //懒加载 - (UISlider *)slider{ if (_slider == nil) { self.slider = [[UISlider alloc]initWithFrame:CGRectMake(20, 60, self.view.frame.size.width - 40, 20)]; //设置当前slider的值,默认是0 _slider.value = 0.5; //已完成线条颜色 _slider.minimumTrackTintColor = [UIColor greenColor]; //未完成部分线条颜色 _slider.maximumTrackTintColor = [UIColor blackColor]; //滑块颜色 _slider.thumbTintColor = [UIColor grayColor]; //添加事件 [_slider addTarget:self action:@selector(valueChanged) forControlEvents:UIControlEventValueChanged]; } return _slider; } //懒加载 - (UIImageView *)imageView{ if (_imageView == nil) { self.imageView = [[UIImageView alloc]initWithFrame:CGRectMake(0, 100, self.view.frame.size.width, 500)]; _imageView.contentMode = UIViewContentModeScaleAspectFit; _imageView.image = [UIImage imageNamed:@"1"]; _imageView.layer.masksToBounds = YES; _imageView.layer.borderWidth = 1; _imageView.alpha = 0.5; } return _imageView; } - (void)valueChanged{ //滑动中随时改变透明度 [self.imageView setAlpha:self.slider.value]; } @end
标签:基本,nonatomic,nullable,self,slider,使用,imageView,property,UISlider 来源: https://www.cnblogs.com/li-wei203/p/10803144.html