iOS8之后蘋果發(fā)布了指紋識(shí)別的功能，通過(guò)touch ID來(lái)識(shí)別用戶，做用戶授權(quán)，主要是依賴于LocalAuthentication庫(kù)

指紋識(shí)別：一判斷設(shè)備是否支持指紋識(shí)別功能

二識(shí)別指紋，成功后做相應(yīng)的動(dòng)作，失敗后提醒用戶指紋識(shí)別失敗

先引入#import <LocalAuthentication/LocalAuthentication.h>

LAContext *context = [[LAContext alloc] init];    NSError *error = nil;    //驗(yàn)證是否支持指紋識(shí)別    if ([context canEvaluatePolicy:LAPolicyDeviceOwnerAuthenticationWithBiometrics error:&error]) {        NSLog(@"支持指紋識(shí)別的應(yīng)用");        //驗(yàn)證身份        [context evaluatePolicy:LAPolicyDeviceOwnerAuthenticationWithBiometrics localizedReason:NSLocalizedString(@"需要指紋來(lái)驗(yàn)證你的身份", @"hello") reply:^(BOOL success, NSError *error) {            if (success) {                NSLog(@"成功");            } else {                switch (error.code) {                    case LAErrorUserCancel:                        NSLog(@"用戶取消了授權(quán) - %@", error.localizedDescription);                        break;                    case LAErrorUserFallback:                        NSLog(@"用戶點(diǎn)擊了“輸入密碼”按鈕 - %@", error.localizedDescription);                        break;                    case LAErrorAuthenticationFailed:                        NSLog(@"您已授權(quán)失敗3次 - %@", error.localizedDescription);                        break;                    case LAErrorTouchIDLockout:                        NSLog(@"指紋被鎖定 - %@", error.localizedDescription);                        break;                    case LAErrorSystemCancel:                        NSLog(@"應(yīng)用程序進(jìn)入后臺(tái) - %@", error.localizedDescription);                        break;                    default:                        NSLog(@"%@---%zd", error.localizedDescription, error.code);                        break;                }            }        }];    } else {        switch (error.code) {            case LAErrorPasscodeNotSet:                NSLog(@"未設(shè)置密碼 - %@", error.localizedDescription);                break;            case LAErrorTouchIDNotEnrolled:                NSLog(@"未注冊(cè) Touch ID - %@", error.localizedDescription);                break;            case kLAErrorTouchIDNotAvailable:                NSLog(@"該設(shè)備不支持 Touch ID - %@", error.localizedDescription);                break;            default:                NSLog(@"--%@--%zd", error.localizedDescription, error.code);                break;        }    }