ios - TouchID登录成功后加载另一个View

Question

我试了一下 TouchID，我有以下问题:

TouchID登录成功后，如何呈现新的ViewController？

viewController.m中的代码是:

#import "ViewController.h"
@import LocalAuthentication;
#import "SVProgressHUD.h"
@interface ViewController ()

@end

@implementation ViewController



- (void)viewDidLoad {
    [super viewDidLoad];

        LAContext *context = [[LAContext alloc] init];
        NSError *error;

        // check if the policy can be evaluated
        if (![context canEvaluatePolicy:LAPolicyDeviceOwnerAuthenticationWithBiometrics error:&error])
        {
            NSLog(@"error:%@", error);
            NSString *msg = [NSString stringWithFormat:@"Can't evaluate policy! %@", error.localizedDescription];
            [SVProgressHUD showErrorWithStatus:msg];
            return;
        }

        // evaluate
        [context evaluatePolicy:LAPolicyDeviceOwnerAuthenticationWithBiometrics
                localizedReason:@"Please login through TouchID"
                          reply:
         ^(BOOL success, NSError *authenticationError) {

             dispatch_async(dispatch_get_main_queue(), ^{

                 if (success) {
                     [SVProgressHUD showSuccessWithStatus:@"Everything Worked!"];
                     //Code for new viewController should come here!
                 }
                 else {
                     NSLog(@"error:%@", authenticationError);
                     [SVProgressHUD showErrorWithStatus:[NSString stringWithFormat:@"FAILED! %@", authenticationError.localizedDescription]];
                 }
             });
         }];
    }


- (void)didReceiveMemoryWarning {
    [super didReceiveMemoryWarning];
    // Dispose of any resources that can be recreated.
}

@end

viewController.h 是标准的。它没有任何变化。感谢支持:)

Answer 1

为了呈现一个 View Controller ，我们通常使用以下方法

1. 如果我们使用 Storyboard，则调用以下方法

   [self performSegueWithIdentifier:@"indentifierForViewController"sender:self];

   1. 如果我们不使用 Storyboard，那么我们可以使用

   NextTaskViewControler *add = [[NextTaskViewControler alloc]
initWithNibName:@"NextTaskViewController"bundle:nil];
[self presentViewController:nextTaskVC animated:YES completion:nil];

我建议您使用 UINavigationController，这是一个专门的 View Controller ，它管理其他 View Controller 以为用户提供分层导航。仅为特定目的呈现 View Controller ，例如呈现照片，其中的操作很少。当 View 层次结构变得复杂时，它很容易维护

请通过UINavigationController Refrence