xcode 在演示过程中演示？尝试使用解析在 facebook 登录后显示新视图。
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Present while a presentation is in progress? Trying to display a new view after facebook login with parse.
提问by STANGMMX
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.
我正在尝试展示我已经为用户制作的 UITableView 以放入数据并保存在解析中。我很确定我没有展示导航视图。
When I log in, I get the error:
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!
Thanks for your help.
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];
}
回答by foundry
This method has been deprecated for a good while
这个方法已经被弃用了很长时间
presentModalViewController:animated:
You should use this instead
你应该改用这个
presentViewController:animated:completion:
Same goes for this
同样适用于此
dismissModalViewControllerAnimated:
Now we use this
现在我们用这个
dismissViewControllerAnimated:completion:
When we don't want a completion block, we just set it to nil.
当我们不需要完成块时，我们只需将其设置为 nil。
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.
但是在您的情况下，完成块可以解决您的问题......它确保事件的正确顺序，即在解散完成之前不会进行展示。
- (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 was incorrect in your original code, I have changed that also. Thanks to Daniel Gfor pointing this out]
[注意 - modalTransitionStyle 在您的原始代码中不正确，我也已更改。感谢Daniel G指出这一点]
