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我正在尝试向此 tableview 添加附件（选中/未选中），出于某种原因，xCode 告诉我此行有问题：[item setObject:cell forKey:@"StrainTableCell"];

控制台向我抛出此错误：

*由于未捕获的异常“NSInternalInconsistencyException”而终止应用程序，原因：“-[__NSCFDictionary setObject:forKey:]: mutating method sent to immutable object”*

有谁知道为什么？请参阅下面的代码片段。

视图控制器.h

#import <UIKit/UIKit.h>
#import "PickerViewController.h"


@interface PickerResultsTableViewController : UITableViewController  {

    NSIndexPath *currentDetailPath;
    bool loaded;


    NSArray *Strains;
    NSArray *searchResults;
    NSMutableArray *dataArray;
    NSMutableData *data;

}

- (IBAction)backbuttonpressed: (UIBarButtonItem *)sender;

@property (strong, nonatomic) NSArray *favoritesArrayset;
@property (strong, nonatomic) IBOutlet UITableView *PickerTableView;
@property (nonatomic, retain) NSArray *searchResults;
@property (nonatomic, strong) NSMutableSet * favoritesArray;

@end

视图控制器.m

- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath

{

    static NSString *strainTableIdentifier = @"StrainTableCell";

    StrainTableCell *cell = (StrainTableCell *)[tableView dequeueReusableCellWithIdentifier:strainTableIdentifier];
    if (cell == nil)


        cell = [[StrainTableCell alloc] initWithStyle:UITableViewCellStyleDefault reuseIdentifier:strainTableIdentifier];

    cell.accessoryType = UITableViewCellAccessoryDisclosureIndicator;
    cell.selectionStyle = UITableViewCellSelectionStyleBlue;


    NSArray *nib = [[NSBundle mainBundle] loadNibNamed:@"StrainTableCell" owner:self options:nil];
    cell = [nib objectAtIndex:0];



        if (tableView == PickerTableView) {
            NSLog(@"Using the search results");

            cell.titleLabel.text = [[searchResults objectAtIndex:indexPath.row] objectForKey:@"Title"];
            cell.descriptionLabel.text = [[searchResults objectAtIndex:indexPath.row] objectForKey:@"Description"];
            cell.ratingLabel.text = [[searchResults objectAtIndex:indexPath.row] objectForKey:@"Rating"];
            cell.ailmentLabel.text = [[searchResults objectAtIndex:indexPath.row] objectForKey:@"Ailment"];
            cell.actionLabel.text = [[searchResults objectAtIndex:indexPath.row] objectForKey:@"Action"];
            cell.ingestLabel.text = [[searchResults objectAtIndex:indexPath.row] objectForKey:@"Ingestion"];

            NSLog(@"%@", searchResults);



        } else {
            NSLog(@"Using the FULL LIST!!");
            cell.titleLabel.text = [[Strains objectAtIndex:indexPath.row] objectForKey:@"Title"];
            cell.descriptionLabel.text = [[Strains objectAtIndex:indexPath.row] objectForKey:@"Description"];
            cell.ratingLabel.text = [[Strains objectAtIndex:indexPath.row] objectForKey:@"Rating"];
            cell.ailmentLabel.text = [[Strains objectAtIndex:indexPath.row] objectForKey:@"Ailment"];
            cell.actionLabel.text = [[Strains objectAtIndex:indexPath.row] objectForKey:@"Action"];
            cell.ingestLabel.text = [[Strains objectAtIndex:indexPath.row] objectForKey:@"Ingestion"];

        }


    NSMutableDictionary *item = [Strains objectAtIndex:indexPath.row];
    cell.textLabel.text = [item objectForKey:@"text"];

    [item setObject:cell forKey:@"StrainTableCell"];
    BOOL checked = [[item objectForKey:@"checked"] boolValue];

    NSLog(@"%i",checked);
    UIImage *image = (checked) ? [UIImage   imageNamed:@"checked.png"] : [UIImage imageNamed:@"unchecked.png"];
    UIButton *button = [UIButton buttonWithType:UIButtonTypeCustom];
    CGRect frame = CGRectMake(0.0, 0.0, image.size.width, image.size.height);
    button.frame = frame;
    [button setBackgroundImage:image forState:UIControlStateNormal];
    [button addTarget:self action:@selector(checkButtonTapped:event:)  forControlEvents:UIControlEventTouchUpInside];
    button.backgroundColor = [UIColor clearColor];
    cell.accessoryView = button;

    return cell;

}
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1 回答 1

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好吧，编译器给你一个很好的提示，告诉你发生了什么：mutating method sent to immutable object. 即使您将 item 声明为 aNSMutableDictionary这并不意味着您从中获取的对象[Strains objectAtIndex:indexPath.row]实际上是一个可变字典。

即使你做这样的事情：

NSDictionary *dict1 = [[NSDictionary alloc] init];

//the following line does not convert dict1 into a mutable dictionary
NSMutableDictionary *dict2 = (NSMutableDictionary*)dict1;

要解决此问题，请确保您添加的对象Strains是可变字典。您可以通过直接实例化一个或调用该mutableCopy方法来做到这一点。

希望这可以帮助！

于 2013-09-13T00:14:22.507 回答