iOS 8的SDK開(kāi)放了Touch ID的接口.從WWDC的視頻中可以看到Touch ID應(yīng)用在兩個(gè)方面:用于Key Chain加密和用于授權(quán).iOS 8正式版發(fā)布以后我們可以看到Evernote的iOS app已經(jīng)集成了該功能.下面來(lái)看看如何實(shí)現(xiàn)使用Touch ID進(jìn)行身份認(rèn)證.

需要的類

LAContext ： 指紋驗(yàn)證操作對(duì)象

沒(méi)錯(cuò)扣孟！這一個(gè)類就夠用了

首先亥啦，我們要確保設(shè)備是否支持指紋識(shí)別磺平，直接貼代碼

LAContext* context = [[LAContextalloc]init];
//錯(cuò)誤對(duì)象
NSError* error =nil;
//首先使用canEvaluatePolicy判斷設(shè)備支持狀態(tài)
BOOL isSupport = [contextcanEvaluatePolicy:LAPolicyDeviceOwnerAuthenticationWithBiometricserror:&error]

NSString*alertName =@"提示信息";
if (isSupport) {
        //支持指紋驗(yàn)證
        [context evaluatePolicy:LAPolicyDeviceOwnerAuthenticationWithBiometrics localizedReason:alertName reply:^(BOOL success, NSError *error) {
            if (success) {
                //驗(yàn)證成功段标，主線程處理UI
                dispatch_queue_t mainQueue = dispatch_get_main_queue();
                dispatch_sync(mainQueue, ^{
                    self.label.text = @"驗(yàn)證成功";
                });
            }
            else
            {
                NSLog(@"%@",error.localizedDescription);
                switch (error.code) {
                    case LAErrorSystemCancel:
                    {
                        NSLog(@"Authentication was cancelled by the system");
                        //切換到其他APP力麸，系統(tǒng)取消驗(yàn)證Touch ID
                        break;
                    }
                    case LAErrorUserCancel:
                    {
                        NSLog(@"Authentication was cancelled by the user");
                        //用戶取消驗(yàn)證Touch ID
                        break;
                    }
                    case LAErrorUserFallback:
                    {
                        NSLog(@"User selected to enter custom password");
                        [[NSOperationQueue mainQueue] addOperationWithBlock:^{
                            //用戶選擇輸入密碼可款，切換主線程處理
                        }];
                        break;
                    }
                    default:
                    {
                        [[NSOperationQueue mainQueue] addOperationWithBlock:^{
                            //其他情況，切換主線程處理
                        }];
                        break;
                    }
                }
            }
        }];
    }
    else
    {
        //不支持指紋識(shí)別克蚂，LOG出錯(cuò)誤詳情
        
        switch (error.code) {
            case LAErrorTouchIDNotEnrolled:
            {
                NSLog(@"TouchID is not enrolled");
                break;
            }
            case LAErrorPasscodeNotSet:
            {
                NSLog(@"A passcode has not been set");
                break;
            }
            default:
            {
                NSLog(@"TouchID not available");
                break;
            }
        }
        
        NSLog(@"%@",error.localizedDescription);
    }```
#總結(jié)

其實(shí)手勢(shì)識(shí)別很簡(jiǎn)單闺鲸，總體來(lái)說(shuō) 只要一個(gè)類，一句代碼埃叭，不過(guò)需要我們判斷的狀態(tài)有那么幾種,我在代碼中已經(jīng)注釋了摸恍。