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控制系统音量,自定义MPVolumeView

2024-07-09 15:46:23   222人阅读

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>

但实际上,在ios7以后,就被弃用了,官方的说法是希望我们用MPVolumeView来代替.那么好,现在有一个问题是,MPVolumeView很难自定义,他只能自定义一些图片,如果我们想通过手势来上下来控制音量大小怎么做呢?

<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>

这个时候还会发现一个问题就是,他的frame是(0,0,35,34),那么你会发现你等于的slider永远都在屏幕的左上角,这个问题我的处理方式是直接hidden = yes,然后重新在建立一个slider与他的值进行关联,然后重写touch事件,这样就可以直接通过手势来控制了.下面是完整代码


<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 = http://www.mamicode.com/0.0;>

源码下载:http://download.csdn.net/detail/woshiwls/7548545


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