ios – 正在进行演示时出席？尝试在Facebook登录后使用解析显示

发布时间：2020-12-15 01:50:51 所属栏目：百科来源：网络整理

导读：我正在尝试提供一个UITableView,我已经为用户输入了数据并保存在解析中.我很确定我没有提供导航视图. 当我登录时,我收到错误： Checklists[4516:c07] Warning: Attempt to present ChecklistsViewController: 0x10525e90 on UINavigationController: 0x96482

我正在尝试提供一个UITableView,我已经为用户输入了数据并保存在解析中.我很确定我没有提供导航视图.

当我登录时,我收到错误：

Checklists[4516:c07] Warning: Attempt to present <ChecklistsViewController: 0x10525e90> 
on <UINavigationController: 0x9648270> while a presentation is in progress!

谢谢你的帮助.

#import "LoginViewController.h"
#import "ChecklistsViewController.h"
#import "SetupViewController.h"
#import <Parse/Parse.h>

@interface LoginViewController ()

@end

@implementation LoginViewController

- (id)initWithNibName:(NSString *)nibNameOrNil bundle:(NSBundle *)nibBundleOrNil
{
    self = [super initWithNibName:nibNameOrNil bundle:nibBundleOrNil];
    if (self) {
        // Custom initialization
    }
    return self;
}

- (void)viewDidAppear:(BOOL)animated
{
    [super viewDidAppear:animated];

    PFLogInViewController *login = [[PFLogInViewController alloc] init];
    login.fields = PFLogInFieldsFacebook;
    // Need to set the delegate to be this controller.
    login.delegate = self;
    login.signUpController.delegate = self; //signUpController is a property on the login view controller
    [self presentModalViewController:login animated:NO];

}

    - (void)logInViewController:(PFLogInViewController *)logInController didLogInUser:(PFUser *)user
{
    [self dismissModalViewControllerAnimated:YES];
    NSLog(@"Successfully logged in.");
    ChecklistsViewController *controller = [[ChecklistsViewController alloc] initWithStyle:UITableViewStylePlain];
    controller.modalTransitionStyle = UITableViewStylePlain;
    [self presentModalViewController:controller animated:YES];

}

解决方法

这种方法已被弃用了很长一段时间

presentModalViewController:animated:

你应该使用它

presentViewController:animated:completion:

同样如此

dismissModalViewControllerAnimated:

现在我们使用它

dismissViewControllerAnimated:completion:

当我们不想要一个完成块时,我们只需将它设置为nil.

但在您的情况下,完成块可以解决您的问题…它确保了正确的事件序列,即在解雇完成之前不会进行呈现.

- (void)logInViewController:(PFLogInViewController *)logInController 
                   didLogInUser:(PFUser *)user
{
    [self dismissViewControllerAnimated:YES completion:^{
        NSLog(@"Successfully logged in.");
        ChecklistsViewController *controller = 
              [[ChecklistsViewController alloc] initWithStyle:UITableViewStylePlain];
        controller.modalTransitionStyle = UIModalTransitionStyleCoverVertical;
        [self presentViewController:controller animated:YES completion:nil];
    }];

}

[NB – modalTransitionStyle在原始代码中不正确,我也改变了.感谢Daniel G指出这个]

（编辑：李大同）

【声明】本站内容均来自网络，其相关言论仅代表作者个人观点，不代表本站立场。若无意侵犯到您的权利，请及时与联系站长删除相关内容!