玩沉默听起来在iOS 8日?Playing silent sounds on iOS 8?

- 此内容更新于:2015-01-27
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I've been trying Sharkfood's Sound Switch for detecting whether the mute switch on an iOS device is turned on.

Their mute.caf for "silent sound" looks indeed silent (i.e. flat) in a sound editor, but when I run their code I hear it as a hissing sound on iPhone 5 (when the device is not on mute, of course).

Is this a feature or a bug, i.e. does iOS perhaps acively prevent against the playing of "silent sounds"?