帮助iOS中

Question

我在与我的应用程序有问题

解析XML，我试图通过复制一个标签来保存核心数据的东西，但它给我这个错误

终止应用程序由于未捕获的异常 'NSInvalidArgumentException'，原因是： ' - [__ NSCFString appendString：]：无参数'

这是代码

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


    static NSString *CellIdentifier = @"Cell"; 

    UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:CellIdentifier]; 
    if (cell == nil) { 
     cell = [[[UITableViewCell alloc] initWithStyle:UITableViewCellStyleSubtitle reuseIdentifier:CellIdentifier] autorelease]; 
    } 



    ClientDownload *currentClientDownload = [[xmlClientDownloadParser clientArray] objectAtIndex:indexPath.row]; 


    CGRect contentFrame = CGRectMake(45, 2, 265, 30); 
    clientName = [[[UILabel alloc] initWithFrame:contentFrame] autorelease]; 
    clientName.numberOfLines = 2; 
    clientName.font = [UIFont boldSystemFontOfSize:12]; 
    clientName.text = [currentClientDownload NAME]; 
    [cell.contentView addSubview:clientName]; 

    CGRect detailFrame1 = CGRectMake(45, 40, 265, 30); 
    clientMobile = [[[UILabel alloc] initWithFrame:detailFrame1] autorelease]; 

    CGRect detailFrame2 = CGRectMake(45, 40, 265, 30); 
    clientAccount = [[[UILabel alloc] initWithFrame:detailFrame2] autorelease]; 

    clientAccount.font = [UIFont systemFontOfSize:10]; 
    clientAccount.text = [currentClientDownload ACCOUNT]; 
    clientMobile.font = [UIFont systemFontOfSize:10]; 
    clientMobile.text = [currentClientDownload MOBILE]; 


    [cell.contentView addSubview:clientAccount]; 
    [cell.contentView addSubview:clientMobile]; 

    NSLog(@"SaveData"); 
    Clients *client = (Clients *)[NSEntityDescription insertNewObjectForEntityForName:@"Clients" inManagedObjectContext:managedObjectContext]; 
    if((clientName.text) || (clientAccount.text) || (clientMobile.text) != NULL) 
    { 
     client.ACCOUNT = clientAccount.text; 
     client.NAME = clientName.text; 
     client.MOBILE = clientMobile.text; 
     NSLog(@"CLIENT GENERATED"); 
     NSError *error; 

     if (![managedObjectContext save:&error]) 
     { 
      NSLog(@"Problem saving: %@", [error localizedDescription]); 
     } 

} 
    NSError * error; 
    NSFetchRequest *fetchRequest = [[NSFetchRequest alloc] init]; 
    NSEntityDescription *entity = [NSEntityDescription entityForName:@"Clients" inManagedObjectContext:managedObjectContext]; 
    [fetchRequest setEntity:entity]; 
    NSArray *fetchedObjects = [managedObjectContext executeFetchRequest:fetchRequest error:&error]; 


    for (NSManagedObject *info in fetchedObjects) 

    { 

     NSLog(@"ACCOUNT: %@",[info valueForKey:@"ACCOUNT"]); 
     NSLog(@"NAME: %@",[info valueForKey:@"NAME"]); 
     NSLog(@"MOBILE: %@",[info valueForKey:@"MOBILE"]); 

    } 

    [fetchRequest release]; 
    return cell; 

} 

Answer 1

正如我看你有没有错的，如果语句的位置：

    if((clientName.text) || (clientAccount.text) || (clientMobile.text) != NULL)

看起来应该像这样的（如果我没有记错的话）：

if((clientName.text != NULL) && (clientAccount.text != NULL) && (clientMobile.text != NULL))

Answer 2

在你的if语句，你正在检查所有三个UILabel S代表零文本在同时。这意味着，如果其中一个文本中有文本，而另外两个文本是空的，if条件将返回YES。然后尝试将此空文本分配给您的自定义对象。

您应该修改您的if语句以分别引用每个字段。因此：

if (clientAccount.text != nil) client.ACCOUNT = clientAccount.text; 
if (clientName.text != nil)  client.NAME = clientName.text; 
if (clientMobile.text != nil) client.MOBILE = clientMobile.text; 

如果这样不能解决问题，请发布确切的线路，让您知道崩溃的位置。