NSArrayM replaceObjectAtIndex：withObject：object can not be nil'

Question

我有一個項目與this相同的菜單，但與子菜單相同的幻燈片動畫。我創建了一個名爲SecondMenu.xib的xib文件名。文件所有者是UIViewController並將其命名爲SecondMenuController。如果您檢查項目REFrosted（check the link），則有DEMOMenuViewController（UIViewController）。在方法didSelectRowAtIndexPath：中。我在我的代碼中更改了它

- (void)tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath 
{ 

    NSMutableArray *controllers = [[NSMutableArray alloc] init]; 
    for (unsigned i = 0; i < 1; i++) { 
     [controllers addObject:[NSNull null]]; 
    } 
    self.viewControllers = controllers; 
    SecondMenuController *controller = [self.viewControllers objectAtIndex:0]; 

    if ((NSNull *)controller == [NSNull null]) { 
     controller = [[SecondMenuController alloc] initWithNibName:@"SecondMenu" bundle:nil]; 
     [self.viewControllers replaceObjectAtIndex:0 withObject:controller]; 

    } 

    controller.view.frame = CGRectMake(-self.view.frame.size.width, 0,self.view.frame.size.width,self.view.frame.size.height); 

    [self.view addSubview:controller.view]; 


    [UIView animateWithDuration:0.5 delay:0.0 options:UIViewAnimationOptionCurveEaseInOut animations:^{ 
     controller.view.frame = CGRectMake(0, 0,self.view.frame.size.width,self.view.frame.size.height); 
    } completion:^(BOOL finished) { 
     NSLog(@"Done!"); 
    }]; 

    //[self hideMenu]; 

} 

當連接到子菜單（即SecondMenuController）時，該代碼適用於我。在我的SecondMenuController中，我添加一個按鈕（這將連接到DEMOHomeViewController，故事板標識符是homeController）。這裏是我的按鈕

- (IBAction)buttonConnect:(id)sender { 
    DEMONavigationController *navigationController = [self.storyboard instantiateViewControllerWithIdentifier:@"contentController"]; 

    DEMOHomeViewController *homeViewController = [self.storyboard instantiateViewControllerWithIdentifier:@"homeController"]; 
    navigationController.viewControllers = @[homeViewController]; 

    self.frostedViewController.contentViewController = navigationController; 
    [self.frostedViewController hideMenuViewController]; 
} 

的代碼，我得到這個代碼REFrosted之前，我把它改爲我的代碼在didSelectRowAtIndexPath方法：（正如我在第一個代碼提到上文）。爲什麼我得到這個錯誤

'NSInvalidArgumentException', reason: '*** -[__NSArrayM replaceObjectAtIndex:withObject:]: object cannot be nil' 

我導入所有文件。正如我所瞭解的，當你導入連接到文件所有者的文件時。這意味着我可以控制每個方法或函數，當你將它實例化到我的SecondMenuController時（這只是基於我的經驗，如果我錯了，請糾正我，我只想知道系統是如何工作的）。請參閱我的代碼。我在這裏錯過了什麼嗎？希望你建議我如何解決這個問題或解釋爲什麼我得到這個錯誤。

DEMONavigationController *navigationController = [self.storyboard instantiateViewControllerWithIdentifier:@"contentController"]; 

    DEMOHomeViewController *homeViewController = [self.storyboard instantiateViewControllerWithIdentifier:@"homeController"]; 
    navigationController.viewControllers = @[homeViewController]; 

Answer 1

2天的搜索答案。我終於明白了。

爲什麼DEMOHomeViewController是零，當我點擊按鈕，因爲SecondMenuController沒有連接到DEMOHomeViewController，即使我將它實例化爲SecondMenuController類的原因。我現在學習。這裏的代碼

我做的第一個代碼。我添加此SecondMenuController.h

@property (nonatomic, weak) UIStoryboard * myself; 
@property (nonatomic, strong) REFrostedViewController * ref; 
- (id)initWithNibName:(NSString *)nibNameOrNil bundle:(NSBundle *)nibBundleOrNil myStoryBoard:(UIStoryboard *) xStoryBoard ref: (id) xRef; 

在SecondMenuController.m

- (id)initWithNibName:(NSString *)nibNameOrNil bundle:(NSBundle *)nibBundleOrNil myStoryBoard:(UIStoryboard *) xStoryBoard ref: (id) xRef 
{ 
    self = [super initWithNibName:nibNameOrNil bundle:nibBundleOrNil]; 
    if (self) { 
     // Custom initialization 
     self.myself = xStoryBoard; 
     self.ref = xRef; 
    } 
    return self; 
} 

在我的按鈕

DEMONavigationController *navigationController = [self.myself instantiateViewControllerWithIdentifier:@"contentController"]; 

DEMOSecondViewController *secondViewController = [self.myself instantiateViewControllerWithIdentifier:@"homeController"]; 

navigationController.viewControllers = @[secondViewController]; 


self.ref.frostedViewController.contentViewController = navigationController; 
    [self.ref.frostedViewController hideMenuViewController]; 

現在，它的工作。所有你需要做的就是調用DEMOMenuViewController的initWithNibName：方法。

Answer 2

控制檯日誌意味着你試圖在NSArray中插入nil對象，這是不允許的。如果由於某種原因，您需要添加空物件使用(NSArray *)[NSNull null]。