iOS控制音量和亮度的最简单方式
Home Page: https://github.com/YiQieSuiYuan/BrightnessVolumeView
// 使用方法一 xib使用 拖一个UIView修改继承类为BrightnessVolumeView就可以了
// 使用方法二 全代码使用
BrightnessVolumeView *brightnessVolumeView = [[BrightnessVolumeView alloc] initWithFrame:self.view.bounds];
[self.view addSubview:brightnessVolumeView];
1 MPVolumeView
说明
用这种方式修改会在指定区域生成一个音量条，它会保持与系统音量实时同步，但不可以用代码修改，只能由用户手动拖动音量条控制
这句话不太明白，如果说不能用代码修改，那为什么你确实是可以修改呢？虽然是通过手势，但是实际上也是用代码修改的，为什么可以呢？我自己用代码修改也是不可以的
我第一次打开应用首次调节音量，音量会变到第一格音量，后面就不会出现，每次打开app第一次调节音量都会
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