if ( [[[UIDevice currentDevice] systemVersion] floatValue] >= 7.0){ //check whether the permission open for user in settings AVAuthorizationStatus authStatus = [AVCaptureDevice authorizationStatusForMedia
1.Found clock-sensitive change during active clock edge at time <time> on register "<name>"原因:vector source file中时钟敏感信号(如:数据,允许端,清零,同步加载等)在时钟的边缘同时变化.而时钟敏感信号是不能在时钟边沿变化的.其后果为导致结果不正确.措施:编辑vector source file 2.Verilog HDL assignment warn