为什么我的应用程序崩溃？ UITable和控制器

Question

我有这个没有错误的大表，即使在我看来我太慢了，比我从下载的例子打开更复杂的单元格。问题是当我点击一个单元格，然后回来，在滚动快速的应用程序是在该行崩溃的几秒钟：charImage.image = [self imageForIndex:ch.charId];

如果我删除其下一行崩溃：titleLabel.text = ch.title;

是谁熟悉这个？谢谢。

- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath { 
//NSLog(@"add a new cell at index path %@", indexPath); 
// Each subview in the cell will be identified by a unique tag. 
static NSUInteger const kTitleLabelTag = 2; 
static NSUInteger const kCharImageTag = 3; 
static NSString *kCellID = @"CellID"; 

// Configure the cell 


// Declare references to the subviews which will display the char data. 
UILabel *titleLabel = nil; 
UIImageView *charImage = nil; 
UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:kCellID]; 

if (cell == nil) { 
    // No reusable cell was available, so we create a new cell and configure its subviews. 
    cell = [[[UITableViewCell alloc] initWithStyle:UITableViewCellStyleDefault reuseIdentifier:kCellID] autorelease]; 
    cell.accessoryType = UITableViewCellAccessoryDisclosureIndicator; 
    [cell setBackgroundColor:[UIColor clearColor]]; 
    // 
    charImage = [[[UIImageView alloc] initWithImage:[UIImage imageNamed:@"glyphs/a/1.png"]] autorelease]; 
    charImage.tag = kCharImageTag; 
    charImage.autoresizingMask = UIViewAutoresizingNone; 
    [cell.contentView addSubview:charImage]; 

    titleLabel = [[[UILabel alloc] initWithFrame:CGRectMake(60, 10, 215, 20)] autorelease]; 
    titleLabel.tag = kTitleLabelTag; 
    titleLabel.font = [UIFont systemFontOfSize:16]; 
    titleLabel.textColor = [UIColor whiteColor]; 
    titleLabel.backgroundColor = [UIColor clearColor]; 
    titleLabel.adjustsFontSizeToFitWidth = YES; 
    [cell.contentView addSubview:titleLabel]; 

} else { 
    // A reusable cell was available, so we just need to get a reference to the subviews using their tags. 
    charImage = (UIImageView *)[cell.contentView viewWithTag:kCharImageTag]; 
    titleLabel = (UILabel *)[cell.contentView viewWithTag:kTitleLabelTag]; 
} 


// Get the specific info for this row. 
NSUInteger section = [indexPath section]; 
NSUInteger row = [indexPath row]; 
Char *ch = (Char *)[charsList objectAtIndex:row+section*26]; 

// Set the relevant data for each subview in the cell. 
// Set the image in the cell 
charImage.image = [self imageForIndex:ch.charId]; 
[charImage sizeToFit]; 

int centerX = 30; 
int centerY = 23; 
CGSize size = charImage.frame.size; 
charImage.frame = CGRectMake((int)(centerX - size.width/2), 
          (int)(centerY - size.height/2), 
          size.width, size.height); 

titleLabel.text = ch.title; 

return cell; 

}

-(void)tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath { 

InstantInsightAppDelegate *delegate = [[UIApplication sharedApplication] delegate]; 
NSUInteger section = [indexPath section]; 
NSUInteger row = [indexPath row]; 
Char *ch = (Char *)[charsList objectAtIndex:row+26*section]; 

SqlQueries *db = [SqlQueries alloc]; 
NSArray *glyphsList = [db readGlyphsFromDatabaseAtId: ch.charId]; 
NSArray *charDescription = [db readMoreInfoFromDatabaseAtId: ch.charId]; 
Char *charDetails = [db readInstructionsAndQuotesFromDatabaseAtId: ch.charId]; 
[db release]; 
[ch release]; 

// Navigation logic -- create and push a new view controller 
self.glyphsView = [[GlyphsViewController alloc] initWithStyle:UITableViewStyleGrouped]; 

self.glyphsView.glyphsList = glyphsList; 
self.glyphsView.charDetails = charDetails; 
self.glyphsView.charDescription = charDescription; 
[delegate.navController pushViewController:self.glyphsView animated:YES]; 
[self.glyphsView release]; 
self.glyphsView = nil; 

}

---

下面是详细的错误：它并没有说什么，但我敢肯定，我已经看到了一些有例外

[会话开始于2009-10-05 07:41:25 +0300。] GNU gdb 6.3.50-20050815（Apple版本gdb-967）（Tue 7月14日02:11:58 UTC 2009） 版权所有2004自由软件基金会，公司 GDB是自由软件，涵盖了GNU通用公共许可证，并且您是 欢迎在确定下改变它和/或分发它的副本条件。 输入“show copying”查看条件。 GDB绝对没有保修。请输入“显示保修”以了解详情。 这GDB被配置为“I386的苹果达尔文” .sharedlibrary应用负载规则所有附加 处理96464. （GDB）^ C 其中

#0 0x95fd5688 in objc_msgSend() 
#1 0x00002f60 in -[IndexViewController tableView:cellForRowAtIndexPath:] (self=0xd19610, _cmd=0x319a6b9c, tableView=0x101be00, indexPath=0xd2e890) at /Users/Cristi/Documents/xcode - iPhone/Instant Insight/InstantInsight/Classes/IndexViewController.m:115 
#2 0x30944bd0 in -[UITableView(UITableViewInternal) _createPreparedCellForGlobalRow:withIndexPath:]() 
#3 0x3093e1fc in -[UITableView(UITableViewInternal) _createPreparedCellForGlobalRow:]() 
#4 0x309501f1 in -[UITableView(_UITableViewPrivate) _updateVisibleCellsNow]() 
#5 0x30947715 in -[UITableView layoutSubviews]() 
#6 0x00b3dd94 in -[CALayer layoutSublayers]() 
#7 0x00b3db55 in CALayerLayoutIfNeeded() 
#8 0x00b3d3ae in CA::Context::commit_transaction() 
#9 0x00b3d022 in CA::Transaction::commit() 
#10 0x00b452e0 in CA::Transaction::observer_callback() 
#11 0x30245c32 in __CFRunLoopDoObservers() 
#12 0x3024503f in CFRunLoopRunSpecific() 
#13 0x30244628 in CFRunLoopRunInMode() 
#14 0x32044c31 in GSEventRunModal() 
#15 0x32044cf6 in GSEventRun() 
#16 0x309021ee in UIApplicationMain() 
#17 0x00002718 in main (argc=1, argv=0xbfffee50) at /Users/Cristi/Documents/xcode - iPhone/Instant Insight/InstantInsight/main.m:14 

Answer 1

什么样的“崩溃”的？ EXC_BAD_ACCESS（取消引用不指向有效位置的指针）？或某种objc_exception_throw？

假设你的意思是一个EXC_BAD_ACCESS ...

这是因为从[charsList objectAtIndex:row+section*26]返回的“CH”值不是一个有效的对象。

您需要发现自己的确切原因，但最可能的原因是您已经多次释放对象。当它插入到NSArray中时，对象也可能不是有效的Objective-C对象。

有时它有助于设置NSZombieEnabled（命令选项-x，转到参数选项卡并添加名称= NSZombieEnabled和值= 1到环境变量），因为如果您尝试使用释放目的。

-

无关文体点：你分配SqlQueries但不进行初始化。如果你alloc，总是，总是init。即[[SqlQueries alloc] init]。如果你不关心init，因为你没有任何实例变量，那么你不应该有alloc，你的方法应该是类方法。