How to switch cameras in iOS

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How to switch cameras in iOS

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I initialize the local stream with ICSLocalStream，How to switch cameras ？thanks！

我是用ICSLocalStream初始化的本地流，并设置了ICSStreamConstraints （self.constraints.video.devicePosition=AVCaptureDevicePositionBack;）

但是在切换摄像头时改变self.constraints 不生效！

请问怎么做才可以切换摄像头？

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