Compared with the user interface experience, you put a slider on the interface, and then when you drag the slider, the system's default volume icon will also appear to indicate the current volume. You can think about whether users like this design. If you have a volume slider, you generally don’t want to jump out of the system’s built-in volume interface
When you use the volume property of MPMusicPlayerController to adjust the volume, the picture you want will appear, but this method has been abandoned in 7.0
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Compared with the user interface experience, you put a slider on the interface, and then when you drag the slider, the system's default volume icon will also appear to indicate the current volume. You can think about whether users like this design. If you have a volume slider, you generally don’t want to jump out of the system’s built-in volume interface
When you use the volume property of MPMusicPlayerController to adjust the volume, the picture you want will appear, but this method has been abandoned in 7.0
