控制系統音量,自訂MPVolumeView

標籤：ios   mpvolumeview   custom   自訂mpvolumeview   

最近有一個需求,就是控制系統的音量,我們都知道原理在mediaPlayer.framework架構下,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>

但實際上,在ios7以後,就被棄用了,官方的說法是希望我們用MPVolumeView來代替.那麼好,現在有一個問題是,MPVolumeView很難自訂,他只能自訂一些圖片,如果我們想通過手勢來上下來控制音量大小怎麼做呢?

<span style="font-size:18px;">MPVolumeView *volumeView = [[MPVolumeView alloc] init];    [self.view addSubview:volumeView];    [volumeView sizeToFit];    NSLog(@"%@",volumeView.subviews);</span>

列印他的subViews,你會發現

有一個叫MPVolumeSlider得類,那麼我們只要能控制這個類就行了,可是如果我們強制建立這個類是無法實現的,但是沒關係,他的baseClass是UISlider我們可以通過這種方法實現

<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>

這個時候還會發現一個問題就是,他的frame是(0,0,35,34),那麼你會發現你等於的slider永遠都在螢幕的左上方,這個問題我的處理方式是直接hidden = yes,然後重新在建立一個slider與他的值進行關聯,然後重寫touch事件,這樣就可以直接通過手勢來控制了.下面是完整代碼

<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>

源碼下載:http://download.csdn.net/detail/woshiwls/7548545