Addition of 'doCancel' method for iOS

[jacobira]

Hi! 👋

Firstly, thanks for your work on this project! 🙂

Today I used patch-package to patch react-native-fingerprint-scanner@6.0.0 for the project I'm working on.

Added code to make a method available on iOS that cancels an ongoing biometric authentication process.

Here is the diff that solved my problem:

new file mode 100644
index 0000000..e69de29
diff --git a/node_modules/react-native-fingerprint-scanner/ios/ReactNativeFingerprintScanner.h b/node_modules/react-native-fingerprint-scanner/ios/ReactNativeFingerprintScanner.h
index 6afbca6..23e7e52 100644
--- a/node_modules/react-native-fingerprint-scanner/ios/ReactNativeFingerprintScanner.h
+++ b/node_modules/react-native-fingerprint-scanner/ios/ReactNativeFingerprintScanner.h
@@ -5,6 +5,8 @@
 #endif
 #import <LocalAuthentication/LocalAuthentication.h>
 
+#import <React/RCTBridgeModule.h>
+
 @interface ReactNativeFingerprintScanner : NSObject <RCTBridgeModule>
-	- (NSString *_Nonnull)getBiometryType:(LAContext *_Nonnull)context;
+
 @end
diff --git a/node_modules/react-native-fingerprint-scanner/ios/ReactNativeFingerprintScanner.m b/node_modules/react-native-fingerprint-scanner/ios/ReactNativeFingerprintScanner.m
index e29bad7..a502a07 100644
--- a/node_modules/react-native-fingerprint-scanner/ios/ReactNativeFingerprintScanner.m
+++ b/node_modules/react-native-fingerprint-scanner/ios/ReactNativeFingerprintScanner.m
@@ -8,11 +8,21 @@
 
 @implementation ReactNativeFingerprintScanner
 
+static LAContext *context;
+
 RCT_EXPORT_MODULE();
 
+RCT_EXPORT_METHOD(doCancel)
+{
+    if(context != nil){
+        [context invalidate];
+    }
+}
+
 RCT_EXPORT_METHOD(isSensorAvailable: (RCTResponseSenderBlock)callback)
 {
-    LAContext *context = [[LAContext alloc] init];
+    context = [[LAContext alloc] init];
+    
     NSError *error;
 
     if ([context canEvaluatePolicy:LAPolicyDeviceOwnerAuthenticationWithBiometrics error:&error]) {
@@ -57,7 +67,11 @@ @implementation ReactNativeFingerprintScanner
                   fallback: (BOOL)fallbackEnabled
                   callback: (RCTResponseSenderBlock)callback)
 {
-    LAContext *context = [[LAContext alloc] init];
+    if(context != nil){
+        [context invalidate];
+    }
+    context = [[LAContext alloc] init];
+    
     NSError *error;
 
     // Toggle fallback button
diff --git a/node_modules/react-native-fingerprint-scanner/src/.DS_Store b/node_modules/react-native-fingerprint-scanner/src/.DS_Store
new file mode 100644
index 0000000..d2c4feb
Binary files /dev/null and b/node_modules/react-native-fingerprint-scanner/src/.DS_Store differ
diff --git a/node_modules/react-native-fingerprint-scanner/src/doCancel.ios.js b/node_modules/react-native-fingerprint-scanner/src/doCancel.ios.js
new file mode 100644
index 0000000..ef3f0c7
--- /dev/null
+++ b/node_modules/react-native-fingerprint-scanner/src/doCancel.ios.js
@@ -0,0 +1,7 @@
+import { NativeModules } from "react-native";
+
+const { ReactNativeFingerprintScanner } = NativeModules;
+
+export default () => {
+    ReactNativeFingerprintScanner.doCancel();
+}
\ No newline at end of file
diff --git a/node_modules/react-native-fingerprint-scanner/src/index.js b/node_modules/react-native-fingerprint-scanner/src/index.js
index 3fc84b5..875a90e 100644
--- a/node_modules/react-native-fingerprint-scanner/src/index.js
+++ b/node_modules/react-native-fingerprint-scanner/src/index.js
@@ -1,9 +1,11 @@
 import authenticate from './authenticate';
 import isSensorAvailable from './isSensorAvailable';
 import release from './release';
+import doCancel from './doCancel.ios';
 
 export default {
   authenticate,
   release,
   isSensorAvailable,
+  doCancel,
 };

This issue body was partially generated by patch-package.

[BraveEvidence]

Check my video https://www.youtube.com/watch?v=DAZJ2JhDkNU. It will help you