Question

我正在为ios7编写一个应用程序，它需要控制内置音乐播放器的音量或主音量级别。我尝试过使用MediaPlayer.framework，但不确定是否正确。我想知道最好的方法是什么。谢谢！

Answer 1

根据Apple的说法，在iOS7设置中MPMusicPlayerController的{{1}}已被弃用：

volume

Apple建议使用// 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);，所以我想出了这个：

添加MPVolumeView属性：

volumeSlider

初始化@property (nonatomic, strong) UISlider *volumeSlider;并在视图中添加（可隐藏，无框架或由于MPVolumeView和showsRouteButton = NO而为空）：

showsVolumeSlider = NO

查找并保存对MPVolumeView *volumeView = [MPVolumeView new]; volumeView.showsRouteButton = NO; volumeView.showsVolumeSlider = NO; [self.view addSubview:volumeView];的引用：

UISlider

为__weak __typeof(self)weakSelf = self; [[volumeView subviews] enumerateObjectsUsingBlock:^(id obj, NSUInteger idx, BOOL *stop) { if ([obj isKindOfClass:[UISlider class]]) { __strong __typeof(weakSelf)strongSelf = weakSelf; strongSelf.volumeSlider = obj; *stop = YES; } }];添加目标操作：

UIControlEventValueChanged

然后检测音量变化（即通过硬件音量控制）：

[self.volumeSlider addTarget:self action:@selector(handleVolumeChanged:) forControlEvents:UIControlEventValueChanged];

以及其他方式，您可以通过以下方式设置音量：

- (void)handleVolumeChanged:(id)sender
{
    NSLog(@"%s - %f", __PRETTY_FUNCTION__, self.volumeSlider.value);
}

希望这会有所帮助（并且Apple不会从MPVolumeView中删除MPVolumeSlider）。

Answer 2

试试这个

[[MPMusicPlayerController applicationMusicPlayer] setVolume:(use a value between 0.0 and 1.0)]

如果您想提供音量控制，请尝试此操作

 MPVolumeView *myVolumeView =
    [[MPVolumeView alloc] initWithFrame: CGRectMake(70, 300, 200, 40)];
    [myVolumeView setShowsVolumeSlider:YES];
    [myVolumeView setShowsRouteButton:YES];
    [myVolumeView sizeToFit];
    [myVolumeView setBackgroundColor:[UIColor cyanColor]];
    CGAffineTransform trans = CGAffineTransformMakeRotation(M_PI * 0.5);
    myVolumeView.transform = trans;
    [moviePlayerContlr.view addSubview: myVolumeView];

<强>交替：

UISlider  * aSlider;
    aSlider = [[UISlider alloc] initWithFrame:CGRectMake(70, 200, 100, 40)];
    [aSlider setMaximumValue:0];
    [aSlider setMaximumValue:1];
    [aSlider addTarget:self action:@selector(aSliderAction:) forControlEvents:UIControlEventValueChanged];
    [moviePlayerContlr.view addSubview:aSlider];

    UIImage *stetchTrack = [[UIImage imageNamed:@"faderTrack.png"]
                            stretchableImageWithLeftCapWidth:10.0 topCapHeight:0.0];
    [aSlider setThumbImage: [UIImage imageNamed:@"faderKey.png"] forState:UIControlStateNormal];
    [aSlider setMinimumTrackImage:stetchTrack forState:UIControlStateNormal];
    [aSlider setMaximumTrackImage:stetchTrack forState:UIControlStateNormal];
    CGAffineTransform tran = CGAffineTransformMakeRotation(M_PI * -0.5);
    aSlider.transform = trans;



- (void)aSliderAction:(id)sender
{
    NSLog(@"%d",(int)[aSlider value]);;

[[MPMusicPlayerController applicationMusicPlayer] setVolume:aSlider.value];
}

Answer 3

使用iPodMusicPlayer也会影响实际的iPod音量设置。如果您想避免这种情况，请使用此

#import <MediaPlayer/MediaPlayer.h>
// ...
MPMusicPlayerController *musicPlayer = [MPMusicPlayerController applicationMusicPlayer];
musicPlayer.volume = slider.value; //float value for volume

或试试：

MPMusicPlayerController *musicPlayer = = [MPMusicPlayerController iPodMusicPlayer];
musicPlayer.volume = slider.value; //float value for volume

ios7调整iPod音乐播放器音量

3 个答案: