簡單介紹

支持系統(tǒng)和機型

iOS系統(tǒng)的指紋識別功能最低支持的機型為iPhone 5s暑脆，最低支持系統(tǒng)為iOS 8，雖然安裝iOS 7系統(tǒng)的5s機型可以使用系統(tǒng)提供的指紋解鎖功能捡鱼，但由于API并未開放，所以理論上第三方軟件不可使用。

依賴框架
LocalAuthentication.framework
import <LocalAuthentication/LocalAuthentication.h>

注意事項
做iOS 8以下版本適配時相嵌，務(wù)必進行API驗證屎暇，避免調(diào)用相關(guān)API引起崩潰承桥。

使用類
LAContext指紋驗證操作對象

代碼實現(xiàn)

//初始化上下文對象

    LAContext* context = [[LAContext alloc] init];    //錯誤對象
    NSError  * error = nil;
    NSString * result = @"驗證";
    context.localizedFallbackTitle = @"123";   

    //判斷設(shè)備是否支持touchID
    BOOL isSupport = [context canEvaluatePolicy:
    LAPolicyDeviceOwnerAuthenticationWithBiometrics error:&error];
    if (isSupport) {
        //指紋識別函數(shù)
        [context evaluatePolicy:LAPolicyDeviceOwnerAuthenticationWithBiometrics 
        localizedReason:@"用 Touch ID 登錄" 
        reply:^(BOOL success, NSError *error) {
            
            
          //如果成功
            if (success) {
                NSLog(@"驗證成功");
            }else{
                switch (error.code) {
                    case LAErrorSystemCancel:
                    {
                        NSLog(@"Authentication was cancelled by the system");
                        //切換到其他APP，系統(tǒng)取消驗證Touch ID
                        break;
                    }
                    case LAErrorUserCancel:
                    {
                        NSLog(@"Authentication was cancelled by the user");
                        //用戶取消驗證Touch ID
                        break;
                    }
                    case LAErrorUserFallback:
                    {
                        NSLog(@"User selected to enter custom password");
                        [[NSOperationQueue mainQueue] addOperationWithBlock:^{
                            //用戶選擇輸入密碼根悼，切換主線程處理
                        }];
                        break;
                    }
                }
            }
        }];

} else {
  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);
}
    

下面是LAError中每個枚舉對應(yīng)的含義

typedef NS_ENUM(NSInteger, LAError){
      
 //授權(quán)失敗    
    LAErrorAuthenticationFailed = kLAErrorAuthenticationFailed,         
//用戶取消Touch ID授權(quán)   
    LAErrorUserCancel           = kLAErrorUserCancel,         
//用戶選擇輸入密碼     
    LAErrorUserFallback         = kLAErrorUserFallback,        
 //系統(tǒng)取消授權(quán)(例如其他APP切入)    
    LAErrorSystemCancel         = kLAErrorSystemCancel,         
//系統(tǒng)未設(shè)置密碼   
     LAErrorPasscodeNotSet       = kLAErrorPasscodeNotSet,         
//設(shè)備Touch ID不可用凶异，例如未打開
     LAErrorTouchIDNotAvailable  = kLAErrorTouchIDNotAvailable,         
//設(shè)備Touch ID不可用蜀撑，用戶未錄入
     LAErrorTouchIDNotEnrolled   = kLAErrorTouchIDNotEnrolled,
  
}