Frequently Asked Component Specific Questions
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TMS iCLHow to verify if TouchID is available on the device
As soon as you add the LocalAuthentication component, you are bound to iOS 8.0. The component already internally checks if authentication is possible before executing it. There is currently no separate verification but if you want to verify if TouchID is available you can use the following code (it requires the FMX.TMSNativeUICore unit)
function TForm1.TouchIDAvailable: Boolean;
var
ctx: LAContext;
error: PPointer;
auth: NativeInt;
begin
result := False;
ctx := TLAContext.Wrap(TLAContext.Wrap(TLAContext.OCClass.alloc).init);
error := nil;
auth := LAPolicyDeviceOwnerAuthenticationWithBiometrics;
if ctx.canEvaluatePolicy(auth, error) then
Result := True;
ctx.release;
end;
