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I resolved this problem.Yoy can change AVCaptureDevice *device = [AVCaptureDevice defaultDeviceWithMediaType:AVMediaTypeVideo];by AVCaptureDevice *device = [AVCaptureDevice defaultDeviceWithDeviceType:AVCaptureDeviceTypeBuiltInDualCamera mediaType:AVMediaTypeVideo position:AVCaptureDevicePositionBack]; if (!device) { device = [AVCaptureDevice defaultDeviceWithDeviceType:AVCaptureDeviceTypeBuiltInWideAngleCamera mediaType:AVMediaTypeVideo position:AVCaptureDevicePositionBack]; if (!device) { device = [AVCaptureDevice defaultDeviceWithDeviceType:AVCaptureDeviceTypeBuiltInWideAngleCamera mediaType:AVMediaTypeVideo position:AVCaptureDevicePositionFront]; } }Good luck !

I use iphone 6s and iphone x, not simulatornot error and i receive log: 2019-07-26 15:07:54.463158+0700 TestZoom[1796:606237] desiredZoomFactor ===> 5.1348042019-07-26 15:07:54.481863+0700 TestZoom[1796:606237] desiredZoomFactor ===> 4.8431372019-07-26 15:07:54.496362+0700 TestZoom[1796:606237] desiredZoomFactor ===> 4.5686272019-07-26 15:07:54.513375+0700 TestZoom[1796:606237] desiredZoomFactor ===> 4.3455882019-07-26 15:07:54.530682+0700 TestZoom[1796:606237] desiredZoomFactor ===> 4.1225492019-07-26 15:07:54.546849+0700 TestZoom[1796:606237] desiredZoomFactor ===> 3.8995102019-07-26 15:07:54.563013+0700 TestZoom[1796:606237] desiredZoomFactor ===> 3.6764712019-07-26 15:07:54.581750+0700 TestZoom[1796:606237] desiredZoomFactor ===> 3.4705882019-07-26 15:07:54.596273+0700 TestZoom[1796:606237] desiredZoomFactor ===> 3.2990202019-07-26 15:07:54.613307+0700 TestZoom[1796:606237] desiredZoomFactor ===> 3.1446082019-07-26 15:07:54.630610+0700 TestZoom[1796:606237] desiredZoomFactor ===> 2.9730392019-07-26 15:07:54.646943+0700 TestZoom[1796:606237] desiredZoomFactor ===> 2.8357842019-07-26 15:07:54.663193+0700 TestZoom[1796:606237] desiredZoomFactor ===> 2.7328432019-07-26 15:07:54.680210+0700 TestZoom[1796:606237] desiredZoomFactor ===> 2.6299022019-07-26 15:07:54.696571+0700 TestZoom[1796:606237] desiredZoomFactor ===> 2.5441182019-07-26 15:07:54.712911+0700 TestZoom[1796:606237] desiredZoomFactor ===> 2.4926472019-07-26 15:07:54.729334+0700 TestZoom[1796:606237] desiredZoomFactor ===> 2.4411762019-07-26 15:07:54.746316+0700 TestZoom[1796:606237] desiredZoomFactor ===> 2.4411762019-07-26 15:07:54.762319+0700 TestZoom[1796:606237] desiredZoomFactor ===> 2.4240202019-07-26 15:07:54.779547+0700 TestZoom[1796:606237] desiredZoomFactor ===> 2.4240202019-07-26 15:07:54.795554+0700 TestZoom[1796:606237] desiredZoomFactor ===> 2.4240202019-07-26 15:07:54.812554+0700 TestZoom[1796:606237] desiredZoomFactor ===> 2.4240202019-07-26 15:07:54.828762+0700 TestZoom[1796:606237] desiredZoomFactor ===> 2.4240202019-07-26 15:07:54.845939+0700 TestZoom[1796:606237] desiredZoomFactor ===> 2.5098042019-07-26 15:07:54.863254+0700 TestZoom[1796:606237] desiredZoomFactor ===> 2.8014712019-07-26 15:07:54.880149+0700 TestZoom[1796:606237] desiredZoomFactor ===> 3.2132352019-07-26 15:07:54.896428+0700 TestZoom[1796:606237] desiredZoomFactor ===> 3.6250002019-07-26 15:07:54.913370+0700 TestZoom[1796:606237] desiredZoomFactor ===> 3.9509802019-07-26 15:07:54.929742+0700 TestZoom[1796:606237] desiredZoomFactor ===> 4.4313732019-07-26 15:07:54.948228+0700 TestZoom[1796:606237] desiredZoomFactor ===> 4.8259802019-07-26 15:07:54.962945+0700 TestZoom[1796:606237] desiredZoomFactor ===> 5.2205882019-07-26 15:07:54.980484+0700 TestZoom[1796:606237] desiredZoomFactor ===> 5.5808832019-07-26 15:07:54.996428+0700 TestZoom[1796:606237] desiredZoomFactor ===> 5.8725492019-07-26 15:07:55.013331+0700 TestZoom[1796:606237] desiredZoomFactor ===> 6.1299022019-07-26 15:07:55.029615+0700 TestZoom[1796:606237] desiredZoomFactor ===> 6.4044122019-07-26 15:07:55.046736+0700 TestZoom[1796:606237] desiredZoomFactor ===> 6.6446082019-07-26 15:07:55.062916+0700 TestZoom[1796:606237] desiredZoomFactor ===> 6.9019612019-07-26 15:07:55.081425+0700 TestZoom[1796:606237] desiredZoomFactor ===> 7.1936272019-07-26 15:07:55.095991+0700 TestZoom[1796:606237] desiredZoomFactor ===> 7.3823532019-07-26 15:07:55.112833+0700 TestZoom[1796:606237] desiredZoomFactor ===> 7.5710782019-07-26 15:07:55.129078+0700 TestZoom[1796:606237] desiredZoomFactor ===> 7.7426472019-07-26 15:07:55.145997+0700 TestZoom[1796:606237] desiredZoomFactor ===> 7.9142162019-07-26 15:07:55.162355+0700 TestZoom[1796:606237] desiredZoomFactor ===> 8.0000002019-07-26 15:07:55.179148+0700 TestZoom[1796:606237] desiredZoomFactor ===> 8.0000002019-07-26 15:07:55.195506+0700 TestZoom[1796:606237] desiredZoomFactor ===> 8.0000002019-07-26 15:07:55.212815+0700 TestZoom[1796:606237] desiredZoomFactor ===> 8.0000002019-07-26 15:07:55.229338+0700 TestZoom[1796:606237] desiredZoomFactor ===> 8.0000002019-07-26 15:07:55.247669+0700 TestZoom[1796:606237] desiredZoomFactor ===> 8.0000002019-07-26 15:07:55.263103+0700 TestZoom[1796:606237] desiredZoomFactor ===> 8.000000