IOS开发中用开关（UISwitch）跟滑块(UISlider)控制手机屏幕的亮度

.h文件

#import <UIKit/UIKit.h>

 

@interface ViewController : UIViewController

@property(strong,nonatomic)UISlider *mysld;

@property(strong,nonatomic)UISwitch *myswitch;

@property(strong,nonatomic)UIImageView *imageview;

@end

 .m文件

@implementation ViewController

 

- (void)viewDidLoad {

    [super viewDidLoad];

    self.imageview=[[UIImageView alloc]initWithImage:[UIImage imageNamed:@"phone.jpg" ]];

    self.imageview.frame=self.view.bounds;

    self.imageview.autoresizingMask=UIViewAutoresizingFlexibleWidth;

    [self.view insertSubview:self.imageview atIndex:0];

    

    //创建一个滑块

    self.mysld=[[UISlider alloc]initWithFrame:CGRectMake(100, 200, 250, 50)];

    [self.view addSubview:self.mysld];

    //创建一个开关

    self.myswitch=[[UISwitch alloc]initWithFrame:CGRectMake(150, 100, 150, 150)];

    [self.view addSubview:self.myswitch];

    

    [self.myswitch addTarget:self action:@selector(changevalue) forControlEvents:UIControlEventValueChanged];

    [self.mysld addTarget:self action:@selector(textvalue) forControlEvents:UIControlEventValueChanged];

}

-(void)changevalue

{

    

    if (self.myswitch.isOn) {

        //设置屏幕默认亮度为0.5

        [self.mysld setValue:0.5];

       self.imageview.alpha=self.mysld.value;

} else

    {

    

        [self.mysld setValue:0.0];

        self.imageview.alpha=self.mysld.value;

    }

}

-(void)textvalue

{

    if (self.myswitch.isOn) {

        self.imageview.alpha=self.mysld.value;

    }

    

 

}