Question

我从自定义UITableView（自己的类和笔尖）将数据加载到UITableViewCell。它工作得很好，直到我尝试访问某些数组的objectAtIndex:indexPath.row。

我会先发布我的代码，你可能会更容易理解我的意思。

- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath {
    static NSString *CellIdentifier = @"CustomCell";
    CustomCell *cell = (CustomCell *) [tableView dequeueReusableCellWithIdentifier:CellIdentifier];

    if (cell == nil){
        NSArray *topLevelObjects = [[NSBundle mainBundle] loadNibNamed:@"CustomCell" owner:self options:nil];
        for (id currentObject in topLevelObjects){
            if ([currentObject isKindOfClass:[CustomCell class]]){
                cell = (CustomCell *) currentObject;
                break;
            }
        }
    }
    // Configure the cell...
    NSUInteger row = indexPath.row;
    cell.titleLabel.text = [postsArrayTitle objectAtIndex:indexPath.row];
    cell.dateLabel.text = [postsArrayDate objectAtIndex:indexPath.row];
    cell.cellImage.image = [UIImage imageWithContentsOfFile:[postsArrayImgSrc objectAtIndex:indexPath.row]];

    return cell;
}

奇怪的是，当它在前三个单元格中加载时它确实有效（它们是130px高），但在我尝试向下滚动时崩溃。（Aka，日志在崩溃前显示三个数字，0, 1, 2）

因此，作为摘要，objectAtIndex:indexPath.row成功运行3 * 3次，但当我尝试在应用中向下滚动，加载新单元格时，应用程序崩溃时出现以下错误：< /强>

2010-05-30 14:00:43.122 app[2582:207] -[NSCFString objectAtIndex:]: unrecognized selector sent to instance 0x5a44bf0 2010-05-30 14:00:43.124 app[2582:207] *** Terminating app due to uncaught exception 'NSInvalidArgumentException', reason: '-[NSCFString objectAtIndex:]: unrecognized selector sent to instance 0x5a44bf0' // Stack 0 CoreFoundation 0x02398c99 __exceptionPreprocess + 185 1 libobjc.A.dylib 0x024e65de objc_exception_throw + 47 2 CoreFoundation 0x0239a7ab -[NSObject(NSObject) doesNotRecognizeSelector:] + 187 3 CoreFoundation 0x0230a496 ___forwarding___ + 966 4 CoreFoundation 0x0230a052 _CF_forwarding_prep_0 + 50 5 myappname 0x00002ab1 -[HomeTableViewController tableView:cellForRowAtIndexPath:] + 605

有关阵列的其他信息：

数组是在.h文件中创建的：

NSArray *postsArrayDate; NSArray *postsArrayTitle; NSArray *postsArrayComments; NSArray *postsArrayImgSrc;

填写viewDidLoad:：

NSURL *urlPosts = [NSURL URLWithString:@"http://mysite/myphpfile.php?posts=2"]; //returns data in this format: DATA1#Data1.1#data1.2~DATA2#data2.1#~ and so on. NSError *lookupError = nil; NSString *data = [[NSString alloc] initWithContentsOfURL:urlPosts encoding:NSUTF8StringEncoding error:&lookupError]; postsData = [data componentsSeparatedByString:@"~"]; [data release], data = nil; urlPosts = nil; postsArrayDate = [[postsData objectAtIndex:2] componentsSeparatedByString:@"#"]; postsArrayTitle = [[postsData objectAtIndex:3] componentsSeparatedByString:@"#"]; postsArrayComments = [[postsData objectAtIndex:4] componentsSeparatedByString:@"#"]; postsArrayImgSrc = [[postsData objectAtIndex:5] componentsSeparatedByString:@"#"];

如何修复此崩溃？

Answer 1

**我遇到了同样的问题，解决了“自我”问题。数组修复了它。 **

<小时/> NSArray只表示“ObjectAtIndex：＃”的单个实例，最终被视为NSString。在创建NSArray时，我创建了tempArray，用对象填充它，将它设置为等于MyArray，释放的tempArray。但设置它等于“MyArray = tempArray;”失败。需要使用“self.MyArray = tempArray;”来处理数组OBJECT它100％有效!!

Answer 2

实际错误是：

-[NSCFString objectAtIndex:]: unrecognized selector sent to instance 0x5d10c20

换句话说，您尝试在objectAtIndex:（NSString）上运行NSCFString，这当然不支持此方法。

您可以按以下方式致电objectAtIndex:三次：

cell.titleLabel.text = [postsArrayTitle objectAtIndex:indexPath.row];
cell.dateLabel.text = [postsArrayDate objectAtIndex:indexPath.row];
cell.cellImage.image = [UIImage imageWithContentsOfFile:[postsArrayImg objectAtIndex:indexPath.row]];

因此，postsArrayTitle，postsArrayDate或postsArrayImg似乎不是NSArray，而是NSString。

cellForRowAtIndexPath：尝试访问数组时遇到崩溃objectAtIndex：indexPath.row

2 个答案: