ios – 正在进行演示时出席？尝试在Facebook登录后使用解析显示新视图.

概述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> whil 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];}

@R_301_6120@ 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]

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