最近有一个需求,就是控制系统的音量,我们都知道原理在mediaPlayer.framework框架下,有方法
<span style="font-size:18px;">// The current volume of playing music, in the range of 0.0 to 1.0. // This property is deprecated -- use MPVolumeView for volume control instead. @property(nonatomic) float volume NS_DEPRECATED_IOS(3_0, 7_0); [[MPMusicPlayerController applicationMusicPlayer] setVolume:self.volumeSlider.value];</span>
<span style="font-size:18px;">MPVolumeView *volumeView = [[MPVolumeView alloc] init]; [self.view addSubview:volumeView]; [volumeView sizeToFit]; NSLog(@"%@",volumeView.subviews);</span>
打印他的subViews,你会发现
有一个叫MPVolumeSlider得类,那么我们只要能控制这个类就行了,可是如果我们强制创建这个类是无法实现的,但是没关系,他的baseClass是UISlider我们可以通过这种方法实现
<span style="font-size:18px;">self.slider = [[UISlider alloc]init]; self.slider.backgroundColor = [UIColor blueColor]; for (UIControl *view in volumeView.subviews) { if ([view.superclass isSubclassOfClass:[UISlider class]]) { NSLog(@"1"); self.slider = (UISlider *)view; } } self.slider.autoresizesSubviews = NO; self.slider.autoresizingMask = UIViewAutoresizingNone; [self.view addSubview:self.slider]; </span>
<span style="font-size:18px;"> #import "ViewController.h" @interface ViewController () @property (nonatomic,strong)UISlider *volumeSlider; @property (nonatomic,strong)UISlider *slider; @property (nonatomic,assign)CGPoint firstPoint; @property (nonatomic,assign)CGPoint secondPoint; @end @implementation ViewController - (void)viewDidLoad { [super viewDidLoad]; // Do any additional setup after loading the view, typically from a nib. MPVolumeView *volumeView = [[MPVolumeView alloc] init]; [self.view addSubview:volumeView]; [volumeView sizeToFit]; NSLog(@"%@",volumeView.subviews); self.slider = [[UISlider alloc]init]; self.slider.backgroundColor = [UIColor blueColor]; for (UIControl *view in volumeView.subviews) { if ([view.superclass isSubclassOfClass:[UISlider class]]) { NSLog(@"1"); self.slider = (UISlider *)view; } } self.slider.autoresizesSubviews = NO; self.slider.autoresizingMask = UIViewAutoresizingNone; [self.view addSubview:self.slider]; self.slider.hidden = YES; NSLog(@"%f",self.slider.value); // UISlider *slider = // self.volumeSlider = [[UISlider alloc]initWithFrame:CGRectMake(100, 100, 200, 100)]; // self.volumeSlider.backgroundColor = [UIColor yellowColor]; // self.volumeSlider.minimumValue = 0.0; // self.volumeSlider.maximumValue = 1.0; // self.volumeSlider.continuous = YES; // [self.volumeSlider addTarget:self action:@selector(volumeChange) forControlEvents:UIControlEventValueChanged]; // [self.view addSubview:self.volumeSlider]; UISlider *slider1 = [[UISlider alloc] initWithFrame:CGRectMake(0, 100, 200, 20)]; slider1.tag = 1000; slider1.minimumValue = self.slider.minimumValue; slider1.maximumValue = self.slider.maximumValue; slider1.value = self.slider.value; [slider1 addTarget:self action:@selector(updateValue:) forControlEvents:UIControlEventValueChanged]; [self.view addSubview:slider1]; } - (void)updateValue:(UISlider *)slider{ self.slider.value = slider.value; } - (void)volumeChange { [[MPMusicPlayerController applicationMusicPlayer] setVolume:self.volumeSlider.value]; } - (void)touchesBegan:(NSSet *)touches withEvent:(UIEvent *)event{ for(UITouch *touch in event.allTouches) { self.firstPoint = [touch locationInView:self.view]; } UISlider *slider = (UISlider *)[self.view viewWithTag:1000]; slider.value = self.slider.value; NSLog(@"touchesBegan"); } - (void)touchesMoved:(NSSet *)touches withEvent:(UIEvent *)event{ for(UITouch *touch in event.allTouches) { self.secondPoint = [touch locationInView:self.view]; } NSLog(@"firstPoint==%f || secondPoint===%f",self.firstPoint.y,self.secondPoint.y); NSLog(@"first-second==%f",self.firstPoint.y - self.secondPoint.y); self.slider.value += (self.firstPoint.y - self.secondPoint.y)/500.0; UISlider *slider = (UISlider *)[self.view viewWithTag:1000]; slider.value = self.slider.value; NSLog(@"value == %f",self.slider.value); self.firstPoint = self.secondPoint; } - (void)touchesEnded:(NSSet *)touches withEvent:(UIEvent *)event{ NSLog(@"touchesEnded"); self.firstPoint = self.secondPoint = CGPointZero; } </span>
源码下载:http://download.csdn.net/detail/woshiwls/7548545
控制系统音量,自定义MPVolumeView,布布扣,bubuko.com
原文:http://blog.csdn.net/ioswyl88219/article/details/34419377