UI基础--UISlider&UIProgress

声明属性:

#import <UIKit/UIKit.h>

@interface ViewController : UIViewController

{
    //滑动条(音量)
    UISlider *_slider;
    //进度条对象(一般表示进度)
    UIProgressView *_progressView;
}

//进度条
@property (nonatomic, strong) UIProgressView * pView;
//滑动条
@property (nonatomic, strong) UISlider *slid;

@end

创建对象:

#import "ViewController.h"

@interface ViewController ()

@end

@implementation ViewController

//同步成员变量和属性
@synthesize slid = _slider;
@synthesize pView = _pView;

- (void)viewDidLoad {
    [super viewDidLoad];
    // Do any additional setup after loading the view, typically from a nib.
    //设置背景颜色
    self.view.backgroundColor = [UIColor yellowColor];
    
    //进度条的创建(不能主动的添加事件)
    _progressView = [[UIProgressView alloc]init];
    //设置进度条的大小和位置(高度是不可变化的)
    _progressView.frame = CGRectMake(10, 50, 300, 10);
    
    //设置进度条的风格颜色值
    _progressView.progressTintColor = [UIColor redColor];
    
    //设置进度条的进度值(0--1)
    _progressView.progress = 0.5;
    //设置进度条的风格
    _progressView.progressViewStyle = UIProgressViewStyleDefault;
    
    _progressView.trackTintColor = [UIColor blackColor];
    
    //添加到当前视图上面
    [self.view addSubview:_progressView];
    
    
    
    _slider = [[UISlider alloc]init];
    _slider.frame = CGRectMake(10, 100, 300, 40);
    
    //设置最大值
    _slider.maximumValue = 100;
    //设置最小值(可以为负值)
    _slider.minimumValue = -100;
    
    //设置滑动条滑块的位置
    _slider.value = 0.5;
    
    //滑块左侧颜色
    _slider.minimumTrackTintColor = [UIColor lightGrayColor];
    //滑块右侧颜色
    _slider.maximumTrackTintColor = [UIColor redColor];
    
    //设置滑块的颜色
    _slider.thumbTintColor = [UIColor purpleColor];
    
    //添加滑块滑动事件
    [_slider addTarget:self action:@selector(SliderAct:) forControlEvents:UIControlEventValueChanged];
    
    [self.view addSubview:_slider];
    
    
}

- (void)SliderAct:(UISlider *)slider{
    
    NSLog(@"value = %.2f", slider.value);
    //滑动滑块改变进度条的位置
//    _progressView.progress = slider.value;
    //如果值超出范围,需要写个个算法
    _progressView.progress = (slider.value - slider.minimumValue) / (_slider.maximumValue - slider.minimumValue);
    
    
    
    
}

- (void)didReceiveMemoryWarning {
    [super didReceiveMemoryWarning];
    // Dispose of any resources that can be recreated.
}

@end