在演示文稿正在进行时出席?尝试在Facebook登录后使用解析显示新视图。 [英] Present while a presentation is in progress? Trying to display a new view after facebook login with parse.
问题描述
我正在尝试提供一个UITableView,我已经为用户提供了数据并保存在解析中。我很确定我没有提供导航视图。
I'm trying to present a UITableView I've already made for users to put in data and save in parse. I'm pretty sure I don't present the navigation view.
当我登录时,我收到错误:
When I log in, I get the error:
Checklists[4516:c07] Warning: Attempt to present <ChecklistsViewController: 0x10525e90>
on <UINavigationController: 0x9648270> while a presentation is in progress!
感谢您的帮助。
#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];
}
推荐答案
此方法已被弃用了一段时间
This method has been deprecated for a good while
presentModalViewController:animated:
你应该使用它
presentViewController:animated:completion:
同样适用于此
dismissModalViewControllerAnimated:
现在我们使用这个
dismissViewControllerAnimated:completion:
当我们不想要一个完成块,我们只需将它设置为nil。
When we don't want a completion block, we just set it to nil.
但在你的情况下,一个完成块可以解决你的问题...它确保了一个正确的序列事件,即在解雇完成之前不会进行呈现。
But in your case, a completion block could fix your problem... it ensures a correct sequence of events, i.e. the presenting won't take place until the dismissing is complete.
- (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 指出这一点]
[NB - modalTransitionStyle was incorrect in your original code, I have changed that also. Thanks to Daniel G for pointing this out]
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