TouchID 指紋登入

注：接入指紋驗證之前確定您的裝置是否支援 TouchID 功能并能正常使用的裝置（iPhone 5s 及以上）。

#import "ViewController.h"
#import <LocalAuthentication/LocalAuthentication.h>   //需要導入這個庫檔案

@interface ViewController ()

@end

@implementation ViewController

- (void)viewDidLoad {

    [super viewDidLoad];

    if ([[self.navigationController.viewControllers firstObject] isEqual:self]) {
        self.navigationItem.title = @"點選調用指紋識别";
    }
}

- (void)touchesBegan:(NSSet<UITouch *> *)touches withEvent:(UIEvent *)event {

    [self touch];
}

- (void)touch {

    if ([[self.navigationController.viewControllers firstObject] isEqual:self]) {
        self.navigationItem.title = @"指紋驗證";

        //定義一個alter按鈕
        LAContext *context = [LAContext new]; //這個屬性是設定指紋輸入失敗之後的彈出框的選項
        context.localizedFallbackTitle = @"輸入密碼"; // 按鈕的标題
        NSError *error = nil; 

        //判斷使用者的手機是否支援指紋
        if ([context canEvaluatePolicy:LAPolicyDeviceOwnerAuthenticationWithBiometrics
                                 error:&error]) {

            NSLog(@"支援指紋識别");

            [context evaluatePolicy:LAPolicyDeviceOwnerAuthenticationWithBiometrics
                    localizedReason:@"指紋登入"
                              reply:^(BOOL success, NSError * _Nullable error) {
                                //這裡是指紋驗證之後傳回資訊
                                //隻傳回 success 值為 TRUE 或 FALSE
                if (success) {

                    NSLog(@"驗證成功 你可以登入了 Go Go");
                } else {

                    NSLog(@"%@",error.localizedDescription);
                    switch (error.code) {
                        case LAErrorSystemCancel: {

                            NSLog(@"系統取消授權，如其他APP切入");
                            break;
                        }
                        case LAErrorUserCancel: {

                            NSLog(@"使用者取消驗證Touch ID");
                            break;
                        }
                        case LAErrorAuthenticationFailed: {

                            NSLog(@"授權失敗");
                            break;
                        }
                        case LAErrorPasscodeNotSet: {

                            NSLog(@"系統未設定密碼");
                            break;
                        }
                        case LAErrorTouchIDNotAvailable: {

                            NSLog(@"裝置Touch ID不可用，例如未打開");
                            break;
                        }
                        case LAErrorTouchIDNotEnrolled: {

                            NSLog(@"裝置Touch ID不可用，使用者未錄入");
                            break;
                        }
                        case LAErrorUserFallback: {

                            [[NSOperationQueue mainQueue] addOperationWithBlock:^{

                                NSLog(@"使用者選擇輸入密碼，切換主線程處理");
                            }];
                            break;
                        }
                        default: {

                            [[NSOperationQueue mainQueue] addOperationWithBlock:^{
                                NSLog(@"其他情況，切換主線程處理");
                            }];
                            break;
                        }
                    }
                }
            }];
        } else {

            NSLog(@"不支援指紋識别");

            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);
        }
    }

}


- (void)didReceiveMemoryWarning {

    [super didReceiveMemoryWarning];
}

@end
           

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