所以我的tableview存在一些问题。我有一个自定义label，我将tableview cell放入UItableviewcell以添加比标准cells更好的图形。但是，我遇到了第一个问题，
我在cells上的文字标签在滚动时互相改写，只有当dequeueReusableCellWithIdentifier:移出屏幕然后又回来时。经过一些研究，我发现它可能与table有关，所以我调整了我的代码。这就是问题二出现的地方。
当我加载scroll时，所有内容都在正确的位置，正确看待所有内容。然而，当我开始- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath {
NSLog(@"Run");
CoCoachAppDelegate *appDelegate = [[UIApplication sharedApplication] delegate];
static NSString *CellIdentifier = @"Cell";
UILabel *label;
UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:CellIdentifier];
NSArray *keys = [[appDelegate rowersDataStore] allKeys];
if (cell == nil) {
cell = [[[UITableViewCell alloc] initWithStyle:UITableViewCellStyleDefault reuseIdentifier:CellIdentifier] autorelease];
// Configure the cell...
label = [[[UILabel alloc] initWithFrame:CGRectMake(20, 15, cell.bounds.size.width - 10, 30)] autorelease];
label.font = [UIFont boldSystemFontOfSize:16];
label.backgroundColor = [UIColor clearColor];
label.shadowColor = [UIColor colorWithWhite:1.0 alpha:0.5];
label.shadowOffset = CGSizeMake(0,1);
label.textColor = [UIColor colorWithRed:0x4c/255.0 green:0x4e/255.0 blue:0x48/255.0 alpha:1.0];
switch (indexPath.section) {
case 0:
label.frame = CGRectMake(0, 15, cell.bounds.size.width - 10, 30);
label.textAlignment = UITextAlignmentCenter;
break;
case 1:
label.textAlignment = UITextAlignmentLeft;
UIImage *accessoryImage = [UIImage imageNamed:@"content_arrow.png"];
UIImageView *accessoryView = [[UIImageView alloc] initWithImage:accessoryImage];
cell.accessoryView = accessoryView;
[accessoryView release];
break;
}
UIImageView *imgView = [[UIImageView alloc] initWithFrame:cell.frame];
UIImage* img = [UIImage imageNamed:@"odd_slice.png"];
imgView.image = img;
cell.backgroundView = imgView;
[imgView release];
//Selected State
UIImage *selectionBackground = [UIImage imageNamed:@"row_selected.png"];
UIImageView *selectionView = [[UIImageView alloc] initWithFrame:cell.frame];
selectionView.image = selectionBackground;
cell.selectedBackgroundView = selectionView;
[selectionView release];
}
switch (indexPath.section) {
case 0:
[label setText:@"Click to add new rower"];
break;
case 1:
[label setText:[[[appDelegate rowersDataStore] objectForKey:[keys objectAtIndex:indexPath.row]] objectForKey:@"Name"]];
break;
}
//Adds Text
[cell addSubview:label];
return cell;
时，我可以到达除了最后一个细胞之外的所有细胞，它将进入第8个细胞的最底层并冻结，但我应该加载9个细胞。
我很困惑其中一些，有人可以提供一些代码或指导来帮助我吗？
感谢。
{{1}}
}
答案 0 :(得分：4)
我在这里看到几个问题。首先，这种方法的一般结构应该是......
- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath {
static NSString *CellIdentifier = @"Cell";
// Attempt to dequeue the cell
UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:CellIdentifier];
// If cell does not exist, create it, otherwise customize existing cell for this row
if (cell == nil) {
// Create cell
cell = [[[UITableViewCell alloc] initWithStyle:UITableViewCellStyleDefault reuseIdentifier:CellIdentifier] autorelease];
// Configure cell:
// *** This section should configure the cell to a state independent of
// whatever row or section the cell is in, since it is only executed
// once when the cell is first created.
}
// Customize cell:
// *** This section should customize the cell depending on what row or section
// is passed in indexPath, since this is executed every time this delegate method
// is called.
return cell;
}
基本上，UITableView使用单个UITableViewCell实例绘制表格视图中的每个单元格。因此，当您首次创建此单元格时，应将其配置为将使用此实例的所有单元格共有的状态，而与indexPath中传递的任何行或节无关。在您的示例中，这涉及创建标签，图像和背景图像实例，并将它们作为子视图添加到单元格中。
创建单元格后（也就是if (cell == nil)语句之外），您应该根据单元格查找indexPath中包含的特定行和部分的方式来自定义其属性。由于您要在代码的这一部分中访问自定义标签，因此我为其分配了tag值，以便我们可以在使用viewWithTag:创建它的代码段之外访问它。一旦我们有了标签，我们就可以根据部分进行自定义，也可以做任何我们想要的事情，例如自定义配件视图。
我稍微修改/清理了下面的代码。到目前为止，这不是最有效或最优雅的方式来做你想做的事情，但我试图保留尽可能多的代码。我没有对此进行过测试，但是如果你尝试它应该可以工作：
- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath {
NSLog(@"Run");
CoCoachAppDelegate *appDelegate = [[UIApplication sharedApplication] delegate];
static NSString *CellIdentifier = @"Cell";
UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:CellIdentifier];
NSArray *keys = [[appDelegate rowersDataStore] allKeys];
if (cell == nil) {
cell = [[[UITableViewCell alloc] initWithStyle:UITableViewCellStyleDefault reuseIdentifier:CellIdentifier] autorelease];
// Configure the cell...
UILabel *label;
label = [[[UILabel alloc] initWithFrame:CGRectMake(20, 15, cell.bounds.size.width - 10, 30)] autorelease];
label.font = [UIFont boldSystemFontOfSize:16];
label.opaque = NO;
label.backgroundColor = [UIColor clearColor];
label.shadowColor = [UIColor colorWithWhite:1.0 alpha:0.5];
label.shadowOffset = CGSizeMake(0,1);
label.textColor = [UIColor colorWithRed:0x4c/255.0 green:0x4e/255.0 blue:0x48/255.0 alpha:1.0];
label.tag = 100;
[cell addSubview:label];
[label release];
UIImageView *imgView = [[UIImageView alloc] initWithFrame:cell.frame];
UIImage* img = [UIImage imageNamed:@"odd_slice.png"];
imgView.image = img;
cell.backgroundView = imgView;
[imgView release];
//Selected State
UIImage *selectionBackground = [UIImage imageNamed:@"row_selected.png"];
UIImageView *selectionView = [[UIImageView alloc] initWithFrame:cell.frame];
selectionView.image = selectionBackground;
cell.selectedBackgroundView = selectionView;
[selectionView release];
}
UILabel *lbl = (UILabel *)[cell viewWithTag:100];
switch (indexPath.section) {
case 0:
cell.accessoryView = nil;
lbl.frame = CGRectMake(0, 15, cell.bounds.size.width - 10, 30);
lbl.textAlignment = UITextAlignmentCenter;
[label setText:@"Click to add new rower"];
break;
case 1:
UIImage *accessoryImage = [UIImage imageNamed:@"content_arrow.png"];
UIImageView *accessoryView = [[UIImageView alloc] initWithImage:accessoryImage];
cell.accessoryView = accessoryView;
[accessoryView release];
lbl.frame = CGRectMake(20, 15, cell.bounds.size.width - 10, 30);
lbl.textAlignment = UITextAlignmentLeft;
[lbl setText:[[[appDelegate rowersDataStore] objectForKey:[keys objectAtIndex:indexPath.row]] objectForKey:@"Name"]];
break;
}
return cell;
}