IOS fingerprint recognition

Source: Internet
Author: User

Today's project uses fingerprint recognition, but the single fingerprint recognition technology is not complex to implement, but it needs to refresh the UI after the validation is successful here I jumped into a hole??????. because fingerprint verification is also done on a child thread

Either to wait for a long time, or to report a mess of mistakes, I was drunk to see

#import "ViewController.h"

Local authentication framework for fingerprint identification (IOS8 appears)

#import <LocalAuthentication/LocalAuthentication.h>

@interface Viewcontroller ()

@end

@implementation Viewcontroller

-(void) Viewdidload {

[Super Viewdidload];

Additional setup after loading the view, typically from a nib.

}

-(void) Touchesbegan: (Nsset<uitouch *> *) touches withevent: (uievent *) event{

Determine if fingerprint unlock is available, no API, use can to determine (consistent with camera input)

1. Create an authentication context

Lacontext *context = [[Lacontext alloc] init];

2. Judging the device to recognize

/**

Policy device (device) owner (owner): Device owner

Authentication: Certification

Biometics: Timely biometric identification (fingerprint unlocking, face recognition, iris recognition)

*/

Lapolicydeviceownerauthenticationwithbiometrics

Lapolicydeviceownerauthentication//ios9 Type (the difference from iOS8 is that after multiple click errors, click Enter password will pop up the password page, iOS8 not)

if ([Context canevaluatepolicy:lapolicydeviceownerauthentication Error:nil]) {

To start validating Lapolicydeviceownerauthentication This enumeration value, you need to verify with the above that the device can be written consistently.

[Context evaluatepolicy:lapolicydeviceownerauthentication localizedreason:@ "pop-up fingerprint Verification description" reply:^ (BOOL success, Nserror * _nullable error) {

if (success) {

Code return 0 for certification success

NSLog (@ "Certified success-->%zd", Error.code);

} else {

In actual development, users need to do different business logic processing for code type.

/**

-2: User Active Click Cancel

-1: Three-time identification error

-8: Three recognition errors continue to identify errors two times (this time the password box will pop up)

0: Successful Certification

*/

NSLog (@ "%zd", Error.code);

///Special Note: Fingerprint recognition is also in a child thread, and refreshing the UI needs to go back to the child thread

Otherwise, you can wait a long time, or you will report some strange mistakes, I am fell here??

Dispatch_after (Dispatch_time (Dispatch_time_now, (int64_t) (0.1 * nsec_per_sec)), Dispatch_get_main_queue (), ^{

Self.view.backgroundColor = [Uicolor Greencolor];

});

}

}];

} else {

NSLog (@ "Device not supported");

}

}

IOS fingerprint recognition

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