當前視圖控制器不適用於 ios 9

Question

當前視圖控制器不適用於 ios 9，當我按下按鈕時，它沒有重定向到當前視圖控制器。

為什么會發生這種情況？

我試過下面的代碼

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

我也試過下面的代碼

 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];
        });
  }];

編輯

我的完整代碼在這里。 我正在使用 Xcode 7 並在 ios 9 上運行它

#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

注冊視圖控制器

#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

確保presentViewController為零。 如果presentViewController不是nil，則將代碼更改為以下內容。

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

有時主循環會出現錯誤，嘗試以這種方式呈現

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

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

Answer 3

嘗試viewDidAppear in

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

Answer 4

請嘗試以下代碼：

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

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