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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]; }
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:
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];
}];
}
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