How To detect Touch ID is Configured or not in device - ios

Question

I am using this below code for detecting the Touch ID availability in device it works fine
- (BOOL)canAuthenticateByTouchId
{
if ([LAContext class])
{
return [[[LAContext alloc] init] canEvaluatePolicy:LAPolicyDeviceOwnerAuthenticationWithBiometrics error:nil];
}
return NO;
}
- (IBAction)touchIDAvailability
{
if([self canAuthenticateByTouchId])
{
UIAlertView *alert = [[UIAlertView alloc] initWithTitle:#"Congrats"
message:#"Your device have TouchID"
delegate:nil
cancelButtonTitle:#"Ok"
otherButtonTitles:nil];
[alert show];
}
else
{
str = #"TouchID is not available in your device";
UIAlertView *alert = [[UIAlertView alloc] initWithTitle:#"Oops"
message:str
delegate:nil
cancelButtonTitle:#"Ok"
otherButtonTitles:nil];
[alert show];
}
}
After detecting the Touch ID availability i want to find the Touch Id is configured or not
NSString *str;
if (LAErrorTouchIDNotEnrolled)
{
str = #"Please configure your TouchID in Settings > Touch ID & Passcode";
}
UIAlertView *alert = [[UIAlertView alloc] initWithTitle:#"Oops"
message:str
delegate:nil
cancelButtonTitle:#"Ok"
otherButtonTitles:nil];
[alert show];
i configured Touch ID but it still Entered into LAErrorTouchIDNotEnrolled this loop. Can any one knows tell me.

Answer 1

You can check whether user is configured or not using below
[myContext evaluatePolicy:LAPolicyDeviceOwnerAuthenticationWithBiometrics
localizedReason:myLocalizedReasonString
reply:^(BOOL succes, NSError *error) {
}
Here is the complete code for Touch ID
LAContext *myContext = [[LAContext alloc] init];
NSError *authError = nil;
myContext.localizedFallbackTitle=#"Login with Password";//optional for hiding enter password button
NSString *myLocalizedReasonString = #"For touch ID Users Ignore this pop-up and proceed to login with you finger now";
if ([myContext canEvaluatePolicy:LAPolicyDeviceOwnerAuthenticationWithBiometrics error:&authError]) {
[myContext evaluatePolicy:LAPolicyDeviceOwnerAuthenticationWithBiometrics
localizedReason:myLocalizedReasonString
reply:^(BOOL succes, NSError *error) {
if (succes) {
[self showMessage:#"Authentication is successful" withTitle:#"Success"];
NSLog(#"User authenticated"); }
} else {
switch (error.code) {
case LAErrorAuthenticationFailed:
[self showMessage:#"Authentication is failed" withTitle:#"Error"];
NSLog(#"Authentication Failed");
break;
case LAErrorUserCancel:
[self showMessage:#"You clicked on Cancel" withTitle:#"Error"];
NSLog(#"User pressed Cancel button");
break;
case LAErrorUserFallback:
[self showMessage:#"You clicked on \"Enter Password\"" withTitle:#"Error"];
NSLog(#"User pressed \"Enter Password\"");
break;
default:
[self showMessage:#"Touch ID is not configured" withTitle:#"Error"];
NSLog(#"Touch ID is not configured");
break;
}
NSLog(#"Authentication Fails");
}
}];
} else {
NSLog(#"Can not evaluate Touch ID");
NSString *str = #"TouchID is not available in your device";
UIAlertView *alert = [[UIAlertView alloc] initWithTitle:#"Oops"
message:str
delegate:nil
cancelButtonTitle:#"Ok"
otherButtonTitles:nil];
[alert show];
}
}
-(void) showMessage:(NSString*)message withTitle:(NSString *)title
{
[[[UIAlertView alloc] initWithTitle:#"AppName" message:message delegate:nil cancelButtonTitle:#"Cancel" otherButtonTitles:nil, nil] show];
}
Hope it helps you..!