iOS 設置系統音量和監聽系統音量變化

很簡單的調用?

首先在工程引入MediaPlayer.framework

#import <MediaPlayer/MediaPlayer.h>

1. 獲取系統音量

// 獲取系統音量
MPVolumeView *volumeView = [[MPVolumeView alloc] init];UISlider *volumeViewSlider= nil;for (UIView *view in [volumeView subviews]){
if ([view.class.description isEqualToString:@"MPVolumeSlider"]){
volumeViewSlider = (UISlider*)view;
break;}}float systemVolume = volumeViewSlider.value;

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2.監聽方法

  [[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(volumeChanged:) name:@"AVSystemController_SystemVolumeDidChangeNotification" object:nil];

- (void)volumeChanged:(NSNotification *)notification
{[notification.userInfo[@"AVSystemController_AudioVolumeNotificationParameter"] floatValue];}

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?3.記得銷毀哦

- (void)dealloc
{[[NSNotificationCenter defaultCenter] removeObserver:self name:@"AVSystemController_SystemVolumeDidChangeNotification" object:nil];}

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