小编Vol*_*da2的帖子

我创建了自定义 UITableViewCell。

@interface AnswerCell : UITableViewCell
@property (nonatomic, retain) IBOutlet UILabel *textLabel;
@property (nonatomic, retain) IBOutlet UILabel *detailTextLabel;
@end

并设置detailTextLabel.numberOfLines = 0；

        cell = [tableView dequeueReusableCellWithIdentifier:kAnswerIdentifier];
        if (cell == nil)
        {
            [[NSBundle mainBundle] loadNibNamed:@"AnswerCell" owner:self options:nil];
            cell=answerCell;
        }            

        cell.detailTextLabel.text = [self extractText:indexPath forLabelAttribute:kDetailTextLabel];
        cell.detailTextLabel.font = [self extractFont:indexPath forLabelAttribute:kDetailTextLabel];
        cell.detailTextLabel.lineBreakMode = UILineBreakModeWordWrap;
        cell.detailTextLabel.numberOfLines = 0;

UILabel 仅显示文本的第一行。但为什么？

更新：我的detailTextLabel 的高度= 21。我需要做什么？我需要改变高度=1000吗？

我运行我的应用程序,然后获取我的数据.数据还可以.当我第二次跑步时,我的旧价值出现了问题.怎么了？

- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions
{
 NSEntityDescription *entity = [NSEntityDescription entityForName:@"Test" inManagedObjectContext:[self managedObjectContext]]; 
    for (int i =0; i<2; i++) 
    {
        Test *test = [[[Test alloc] initWithEntity:entity insertIntoManagedObjectContext:[self managedObjectContext]] autorelease];
        test.text = @"Text";
        test.index = [NSNumber numberWithInt:i];
    }
    [self saveContext];
}


-(void) showValues
{    
 NSEntityDescription *entity = [NSEntityDescription entityForName:@"Test" inManagedObjectContext:[self managedObjectContext]];
 NSFetchRequest *request = [[[NSFetchRequest alloc] init] autorelease];
 [request setEntity:entity];    
 NSError *error;    
 NSArray *array = [[self managedObjectContext] executeFetchRequest:request error:&error];
 NSLog(@"Array: %@ ", array);    
}

第一次运行

2012-01-22 21:48:52.092 Mew[411:707] Array: ( …

是否可以在NSMakeRange中执行负位置？

NSString *string = @"abc";
NSString *myString = [string substringWithRange:NSMakeRange(-1, 1)];

如何设置编辑= NO; 在UITextField？

scrollRectToVisible不适用于键盘和(下一个/上一个/完成)工具栏.请看图片.

[scrollview scrollRectToVisible: textFieldRect animated:YES];

UITabBarItem图像的最大大小是多少？

如何将一些照片添加到模拟器照片库？

我不完全了解sqlite3_finalize.我的初始代码.

while (j < Autors.count)
{
 if(sqlite3_prepare_v2(database, sqlStatement, -1, &compiledStatement, NULL) == SQLITE_OK) 
 {
    sqlite3_bind_int(compiledStatement,  1, ((AuthorSettings *)[Autors objectAtIndex:j]).authorId);
    if(sqlite3_step(compiledStatement) != SQLITE_DONE) 
    {    
        NSLog(@"sqlite3_step error %s", sqlite3_errmsg(database));
        sqlite3_busy_timeout(database, 5);
    } 
    else
    {    
        if(sqlite3_prepare_v2(database, sqlStatement_1, -1, &compiledStatement, NULL) == SQLITE_OK) 
        {
            sqlite3_bind_int(compiledStatement,  1, bookId);
            if(sqlite3_step(compiledStatement) != SQLITE_DONE) 
            {    
                NSLog(@"sqlite3_step error %s", sqlite3_errmsg(database));
                sqlite3_busy_timeout(database, 5);
            }    
            else  j++;    
        } 
        else NSLog(@"sqlite3_prepare_v2 error %s", sqlite3_errmsg(database));
    }    
 }
}
sqlite3_finalize(compiledStatement);

我添加了sqlite3_finalize函数.请检查我.

while (j < Autors.count)
 {
 sqlite3_finalize(compiledStatement); //**added
 if(sqlite3_prepare_v2(database, sqlStatement, -1, &compiledStatement, NULL) == …

我有一个非常奇怪的sqlite语法错误.

const char *statement = "DELETE FROM quotes t1 WHERE t1.id=127";
int returnCode = sqlite3_exec(database, statement, NULL, NULL, &errorMsg);
if (returnCode!=SQLITE_OK) 
{
    fprintf(stderr, "Error: %s", errorMsg);
    sqlite3_free(errorMsg);
}

 Error: near "t1": syntax error

但是这段代码效果很好

const char *statement = "DELETE FROM quotes WHERE id=127";
int returnCode = sqlite3_exec(database, statement, NULL, NULL, &errorMsg);

我的代码是:

NSString *buffer = (NSString *)CFURLCreateStringByAddingPercentEscapes(NULL, (CFStringRef)name, NULL, (CFStringRef)@"!*'();:@&=+$,/?%#[]", kCFStringEncodingUTF8);

NSString *totalString = [NSString stringWithFormat:@"buffer/%@", buffer];

我运行了"构建和分析工具"并看到:"在第979行分配并存储到'缓冲区'中的对象在此点之后不再被引用,并且保留计数为+1(对象泄漏)".

为什么我可能有泄漏CFURLCreateStringByAddingPercentEscapes？