当前视图控制器不适用于 ios 9

Question

当前视图控制器不适用于 ios 9，当我按下按钮时，它没有重定向到当前视图控制器。

为什么会发生这种情况？

我试过下面的代码

 RegistrationViewController * viewController =[[UIStoryboard storyboardWithName:@"Registration" bundle:nil] instantiateViewControllerWithIdentifier:@"RegistrationViewController"];
 [self presentViewController:viewController animated:YES completion:nil];

我也试过下面的代码

 UIStoryboard* storyboard = [UIStoryboard storyboardWithName:@"Registration"
                                                         bundle:nil];
 RegistrationViewController *add =
 [storyboard instantiateViewControllerWithIdentifier:@"RegistrationViewController"];
 [self presentViewController:add animated:YES completion:^{
        dispatch_async(dispatch_get_main_queue(), ^{
            [self presentViewController:add
                               animated:YES
                             completion:nil];
        });
  }];

编辑

我的完整代码在这里。 我正在使用 Xcode 7 并在 ios 9 上运行它

#import "LoginViewController.h"
#import "RegistrationViewController.h"

@interface LoginViewController ()

@end

@implementation LoginViewController

- (void)viewDidLoad {
    [super viewDidLoad];
    // Do any additional setup after loading the view.
}

- (void)didReceiveMemoryWarning {
    [super didReceiveMemoryWarning];
    // Dispose of any resources that can be recreated.
}


- (IBAction)actionRegistrationClicked:(id)sender
{
    RegistrationViewController * viewController =[[UIStoryboard storyboardWithName:@"Registration" bundle:nil] instantiateViewControllerWithIdentifier:@"RegistrationViewController"];
     [self presentViewController:viewController animated:YES completion:nil];

}
@end

注册视图控制器

#import "RegistrationViewController.h"

@interface RegistrationViewController ()

@end

@implementation RegistrationViewController

- (void)viewDidLoad
{
    [super viewDidLoad];
    // Do any additional setup after loading the view.
}

- (void)didReceiveMemoryWarning
{
    [super didReceiveMemoryWarning];
    // Dispose of any resources that can be recreated.
}

@end

Answer 1

确保presentViewController为零。 如果presentViewController不是nil，则将代码更改为以下内容。

RegistrationViewController * viewController =[[UIStoryboard storyboardWithName:@"Registration" bundle:nil] instantiateViewControllerWithIdentifier:@"RegistrationViewController"];

if ([self presentedViewController]) {
    [[self presentedViewController] dismissViewControllerAnimated:NO completion:^{
        dispatch_async(dispatch_get_main_queue(), ^{
            [self presentViewController:viewController animated:YES completion:nil];
        });
    }];
} else {
    [self presentViewController:viewController animated:YES completion:nil];

}

Answer 2

有时主循环会出现错误，尝试以这种方式呈现

RegistrationViewController *viewController = [[UIStoryboard storyboardWithName:@"Registration" bundle:nil] instantiateViewControllerWithIdentifier:@"RegistrationViewController"];

dispatch_async(dispatch_get_main_queue(), ^{
   [self presentViewController:viewController animated:YES completion:nil];
});

Answer 3

尝试viewDidAppear in

  -(void)viewDidAppear:(BOOL)animated{ 
         [self presentViewController:viewController animated:YES completion:nil];
    }

Answer 4

请尝试以下代码：

RegistrationViewController * viewController = [[self.storyboard instantiateViewControllerWithIdentifier:@"RegistrationViewController"];

[self presentViewController:viewController animated:YES completion:nil];