setZoom method added

ios/RCT/RCTCameraManager.h

@@ -90,6 +90,7 @@ typedef NS_ENUM(NSInteger, RCTCameraTorchMode) {
 - (void)stopSession;
 - (void)focusAtThePoint:(CGPoint) atPoint;
 - (void)zoom:(CGFloat)velocity reactTag:(NSNumber *)reactTag;
+- (void)setZoom;
 
 
 @end

ios/RCT/RCTCameraManager.m

@@ -453,6 +453,20 @@ RCT_EXPORT_METHOD(hasFlash:(RCTPromiseResolveBlock)resolve reject:(RCTPromiseRej
     resolve(@(device.hasFlash));
 }
 
+RCT_EXPORT_METHOD(setZoom:(CGFloat)zoomFactor) {
+    if (isnan(zoomFactor)) {
+        return;
+    }
+    NSError *error = nil;
+    AVCaptureDevice *device = [[self videoCaptureDeviceInput] device];
+    if ([device lockForConfiguration:&error]) {
+        device.videoZoomFactor = zoomFactor;
+        [device unlockForConfiguration];
+    } else {
+        NSLog(@"error: %@", error);
+    }
+}
+
 - (void)startSession {
 #if TARGET_IPHONE_SIMULATOR
   return;

src/Camera.js

@@ -332,6 +332,10 @@ export default class Camera extends Component {
     }
     return CameraManager.hasFlash();
   }
+
+	setZoom(zoomFactor) {
+		return CameraManager.setZoom(zoomFactor);
+	}
 }
 
 export const constants = Camera.constants;