chore: expose a method to set the torch mode (#523)

android/src/main/java/com/rncamerakit/RNCameraKitModule.kt

@@ -37,4 +37,15 @@ class RNCameraKitModule(private val reactContext: ReactApplicationContext) : Rea
             view.capture(options.toHashMap(), promise)
         }
     }
+
+    @ReactMethod
+    fun setTorchMode( mode: String, viewTag: Int) {
+        val context = reactContext
+        val uiManager = context.getNativeModule(UIManagerModule::class.java)
+        context.runOnUiQueueThread {
+            val view = uiManager?.resolveView(viewTag) as CKCamera
+            view.setTorchMode(mode)
+        }
+
+    }
 }

ios/ReactNativeCameraKit/CKCamera.h

@@ -76,6 +76,8 @@ typedef NS_ENUM(NSInteger, CKCameraZoomMode) {
 // api
 - (void)snapStillImage:(NSDictionary*)options success:(CaptureBlock)block onError:(void (^)(NSString*))onError;
 
+- (void)setTorchMode:(AVCaptureTorchMode)torchMode;
+
 + (NSURL*)saveToTmpFolder:(NSData*)data;
 
 @end

ios/ReactNativeCameraKit/CKCameraManager.m

@@ -44,6 +44,17 @@ - (UIView *)view {
     }];
 }
 
+RCT_EXPORT_METHOD(setTorchMode:(NSString*)mode) {
+    AVCaptureTorchMode torchMode;
+    if([mode isEqualToString:@"on"]) {
+        torchMode = AVCaptureTorchModeOn;
+    } else {
+        torchMode = AVCaptureTorchModeOff;
+    }
+
+    [self.camera setTorchMode:torchMode ];
+}
+
 RCT_EXPORT_METHOD(checkDeviceCameraAuthorizationStatus:(RCTPromiseResolveBlock)resolve
                   reject:(__unused RCTPromiseRejectBlock)reject) {
 

src/Camera.android.tsx

@@ -16,6 +16,9 @@ const Camera = React.forwardRef((props: any, ref) => {
       // we must use the general module and tell it what View it's supposed to be using
       return await RNCameraKitModule.capture(options, findNodeHandle(nativeRef.current ?? null));
     },
+    setTorchMode: (mode = "off") => {
+      RNCameraKitModule.setTorchMode(mode, findNodeHandle(nativeRef.current ?? null));
+    },
     requestDeviceCameraAuthorization: () => {
       throw new Error('Not implemented');
     },

src/Camera.ios.tsx

@@ -14,6 +14,9 @@ const Camera = React.forwardRef((props: any, ref: any) => {
     capture: async () => {
       return await CKCameraManager.capture({});
     },
+    setTorchMode: (mode = "off") => {
+      CKCameraManager.setTorchMode(mode);
+    },
     requestDeviceCameraAuthorization: async () => {
       return await CKCameraManager.checkDeviceCameraAuthorizationStatus();
     },

src/types.ts

@@ -1,5 +1,8 @@
+type TorchMode = 'on'| 'off';
+
 export type CameraApi = {
   capture: () => Promise<{ uri: string }>,
+  setTorchMode: (mode: TorchMode) => void;
   requestDeviceCameraAuthorization: () => Promise<boolean>,
   checkDeviceCameraAuthorizationStatus: () => Promise<boolean>,
 };