NSMutableArray无法添加到 [英] NSMutableArray can't be added to

问题描述

我以前过这样的问题，并没有得到满意的答复。

我有一个名为 县，也就是一个NSMutableArray特性的视图控制器。我要去导航屏幕向下的观点，即是有关选择县的地理搜索。因此，在搜索页面向下钻取到 选择县 页面。

我通过的NSMutableArray *县到第二控制器作为我推导航堆栈上的第二个。其实我设置第二个控制器的selectedCounties属性（也一个NSMutableArray）的指针我的第一个控制器的县，你会看到如下。

当我去 ADDOBJECT 来，虽然，我得到这样的：

  ***终止应用程序由于未捕获的异常 'NSInternalInconsistencyException'，原因：***  -  [NSCFArray insertObject：atIndex：]：突变方法发送到不变对象'
  

这是我的代码：

在SearchViewController.h：

  @interface SearchViewController：的UIViewController 
 {
 .... 
 NSMutableArray的*县; 
} 
 
 .... 
 @属性（非原子，保留）的NSMutableArray *县; 
  

在SearchViewController.m：

   - （无效）getLocationsView 
 {
 [keywordField resignFirstResponder]; 
 SearchLocationsViewController * locationsController = 
 [[SearchLocationsViewController的alloc] initWithNibName：@ SearchLocationsView 束：无]; 
 [self.navigationController pushViewController：locationsController动画：YES]; 
 [locationsController setSelectedCounties：self.counties]; 
 [locationsController释放]; 
} 
  

在SearchLocationsViewController.h：

'pre> @interface EventsSearchLocationsViewController：的UIViewController
将的UITableViewDelegate，UITableViewDataSource>
{
...
的NSMutableArray * selectedCounties;

}

...
@属性（非原子，保留）的NSMutableArray * selectedCounties;


在SearchLocationsViewController.m（这里的要点是，我们进行转换的表是活动的每个元素或不选择县列表）：

   - （无效）的tableView：（UITableView的*）的tableView didSelectRowAtIndexPath方法：（NSIndexPath * ）indexPath 
 {
的UITableViewCell *细胞= [的tableView的cellForRowAtIndexPath：indexPath];如果（[self.selectedCounties containsObject：[self.counties objectAtIndex：indexPath.row]]）
 {
 //我们deselcting！ 
 [self.selectedCounties的removeObject：[self.counties objectAtIndex：indexPath.row]]; 
 cell.accessoryView = [[ALLOC的UIImageView] 
 initWithImage：[UIImage的imageNamed：@ red_check_inactive.png]]; 
} 
，否则{
 [self.selectedCounties ADDOBJECT：[self.counties objectAtIndex：indexPath.row]]; 
 cell.accessoryView = [[ALLOC的UIImageView] 
 initWithImage：[UIImage的imageNamed：@ red_check_active.png]]; 
} 
 [的tableView deselectRowAtIndexPath：indexPath动画：YES]; 
} 
  

我们死在 [self.selectedCounties ADDOBJECT .. .. 那里。

现在，当我的NSLog自己 [self.selectedCounties类] ，它告诉我这是一个NSCFArray。

这是如何发生的呢？我了解类束（或我想我反正），但是这是一个明确的具体类型，并且它失去它在杀死了整个事情的方式某种程度上继承。我完全不明白为什么这会发生。

解决方案

我的猜测是，你没有正确分配阵列（例如，的NSMutableArray * ARR = [[NSArray中的alloc] INIT] ，或者被分配一个的NSArray 到的NSMutableArray 变量。你能后，你初始化数组的代码？

I've had this sort of problem before, and it didn't get a satisfactory answer.

I have a viewcontroller with a property called "counties" that is an NSMutableArray. I'm going to drill down a navigation screen to a view that is about selecting the counties for a geographical search. So the search page drills down to the "select counties" page.

I pass NSMutableArray *counties to the second controller as I push the second one on the navigation stack. I actually set that second controller's "selectedCounties" property (also an NSMutableArray) with a pointer to my first controller's "counties", as you'll see below.

When I go to addObject to that, though, I get this:

*** Terminating app due to uncaught exception 'NSInternalInconsistencyException', reason: '*** -[NSCFArray insertObject:atIndex:]: mutating method sent to immutable object'

Here's my code:

in SearchViewController.h:

@interface SearchViewController : UIViewController 
{
    ....
    NSMutableArray *counties;
}

....
@property (nonatomic, retain) NSMutableArray *counties;

in SearchViewController.m:

- (void)getLocationsView
{
    [keywordField resignFirstResponder];
    SearchLocationsViewController *locationsController = 
            [[SearchLocationsViewController alloc] initWithNibName:@"SearchLocationsView" bundle:nil];
    [self.navigationController pushViewController:locationsController animated:YES];
    [locationsController setSelectedCounties:self.counties];
    [locationsController release];
}

in SearchLocationsViewController.h:

@interface EventsSearchLocationsViewController : UIViewController 
    <UITableViewDelegate, UITableViewDataSource>
{
    ...
    NSMutableArray *selectedCounties;

}

...
@property (nonatomic, retain) NSMutableArray *selectedCounties;

in SearchLocationsViewController.m (the point here is, we're toggling each element of a table being active or not in the list of selected counties):

-(void)tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath
{
    UITableViewCell *cell = [tableView cellForRowAtIndexPath:indexPath];
    if ([self.selectedCounties containsObject:[self.counties objectAtIndex:indexPath.row]]) {
        //we're deselcting!
        [self.selectedCounties removeObject:[self.counties objectAtIndex:indexPath.row]];
        cell.accessoryView = [[UIImageView alloc]
                              initWithImage:[UIImage imageNamed:@"red_check_inactive.png"]];
    }
    else {
        [self.selectedCounties addObject:[self.counties objectAtIndex:indexPath.row]];
        cell.accessoryView = [[UIImageView alloc]
                              initWithImage:[UIImage imageNamed:@"red_check_active.png"]];
    }
    [tableView deselectRowAtIndexPath:indexPath animated:YES];
}

We die at [self.selectedCounties addObject.... there.

Now, when I NSLog myself [self.selectedCounties class], it tells me it's an NSCFArray.

How does this happen? I understand about class bundles (or I THINK I do anyway), but this is explicitly a specific type, and it's losing it subclassing at some point in a way that kills the whole thing. I just completely don't understand why that would happen.

解决方案

My guess is that you're not allocating the array properly (e.g., NSMutableArray *arr = [[NSArray alloc] init], or are assigning an NSArray to the NSMutableArray variable. Can you post the code where you initialize the array?

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