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iOS的音量控制接口在MediaPlayer
库中,
1. 首先要将该库导入:
2. 然后在用到的地方引入MPVolumeView
的头文件:
#import <MediaPlayer/MPVolumeView.h>
3. 而MPVolumeView
中负责控制音量的是它的子视图MPVolumeSlider
,而这个类并未对外公开,所以要去控制它,需要遍历volumeView
的子视图,把它找出来,并赋值:
MPVolumeView *volumeView = [{MPVolumeView alloc] init];
UISlider *volumeViewSlider = nil;
for (UIView *view in [volumeView subviews]) {
if ([view.class.description isEqualToString:@"MPVolumeSlider"]) {
volumeViewSlider = (UISlider *)view;
break;
}
}
// change system volume, the value is between 0.0f and 1.0f
[volumeViewSlider setValue:0.3f animated:NO];
// send UI control event to make the change effect right now. 立即生效
[volumeViewSlider sendActionsForControlEvents:UIControlEventTouchUpInside];
然后就可以通过控制volumeViewSlider
去控制系统音量了。
这种情况下,调节音量时会显示系统音量提示框,若要关掉,需将volumeView
添加至当前视图,如不需要volumeView
,可以将它设置到视图外,隐藏掉它:
[volumeView setFrame:CGRectMake(-1000, -100, 100, 100)];
[self.view addSubview:volumeView];
demo地址:VolumePanel(未隐藏volumeView
)