成功登录TouchID后加载另一个View

Question

I played around a bit with TouchID and I have the following question:

After successful TouchID login, how do I present a new ViewController?

The code in the viewController.m is:

#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 is standart. Nothing changed in it. Thanks for support :)

Answer 1

To present a view controller we normally use following methods

1. If we are using storyboard,then call following method

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

   2. If we are not using storyboard then we can use

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

I suggest you to use UINavigationController, a specialized view controller that manages other view controllers to provide a hierarchical navigation for the user. Present a viewcontroller only for specific purpose such as presenting a photo with few actions in it.It's easy to maintain when view hierarchy becomes complex

Please go-through UINavigationController Refrence