Question

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

if (cell == nil) {
    if ([[UIDevice currentDevice] userInterfaceIdiom] == UIUserInterfaceIdiomPhone) {
        cell.accessoryType = UITableViewCellAccessoryDisclosureIndicator;
    }
}
cell.cellDate.text=@"date";
cell.cellDescription.text =@"Description";
cell.cellImageview.image = [UIImage imageNamed:@"sample.png"];
cell.cellTitle.text = @"Title";
NSLog([cell Description]);
return cell;

}

 NSLog([cell Description]);

返回null

上面是我的方法它给出了以下错误：这里

由于未捕获的异常而终止应用 'NSInternalInconsistencyException'，原因：'UITableView dataSource 必须从tableView：cellForRowAtIndexPath：'
返回一个单元格

Answer 1

您没有在if (cell == nil)位内分配新单元格。您需要分配一个新的UITableViewCell来返回。

出行的方式是：

询问具有CellIdentifier
如果单元格为零，则使用CellIdentifier分配新单元格，以便将来可以重复使用。

所以你可以这样：

static NSString *CellIdentifier = @"CustomCell";
//Ask for a cell with the cell identifier
CustomCell *cell = (CustomCell *) [tableView dequeueReusableCellWithIdentifier:CellIdentifier];

//If the cell is nil
if (cell == nil) 
{
//Allocate a new cell with the identifier
    cell = [[CustomCell alloc] init];//put your actual init method here
}
if ([[UIDevice currentDevice] userInterfaceIdiom] == UIUserInterfaceIdiomPhone) 
{
    cell.accessoryType = UITableViewCellAccessoryDisclosureIndicator;
}
cell.cellDate.text=@"date";
cell.cellDescription.text =@"Description";
cell.cellImageview.image = [UIImage imageNamed:@"sample.png"];
cell.cellTitle.text = @"Title";
NSLog([cell Description]);
return cell;

希望这会有所帮助

Answer 2

改变这个：

CustomCell *cell = (CustomCell *) [tableView dequeueReusableCellWithIdentifier:CellIdentifier];

if (cell == nil) {
    if ([[UIDevice currentDevice] userInterfaceIdiom] == UIUserInterfaceIdiomPhone) {
        cell.accessoryType = UITableViewCellAccessoryDisclosureIndicator;
    }
}

致：

CustomCell *cell = (CustomCell *)[tableView dequeueReusableCellWithIdentifier: CellIdentifier];

if (cell == nil) 
{
    cell = [[[CustomCell alloc] initWithStyle:UITableViewCellStyleDefault reuseIdentifier:CellIdentifier] autorelease];
    if ([[UIDevice currentDevice] userInterfaceIdiom] == UIUserInterfaceIdiomPhone) {
          cell.accessoryType = UITableViewCellAccessoryDisclosureIndicator;
    }
}

Answer 3

enter code here// Customize the appearance of table view cell
   - (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:  (NSIndexPath *)indexPath
{
   static NSString *CellIdentifier = @"CustomCell";
   CustomCell *cell = (CustomCell *)[tableView dequeueReusableCellWithIdentifier:  CellIdentifier];

if (cell == nil)
{
     cell = [[[CustomCell alloc] initWithStyle:UITableViewCellStyleDefault reuseIdentifier:CellIdentifier] autorelease];

}

cell.cellDate.text=@"date";
cell.cellDescription.text =@"Description";
cell.cellImageview.image = [UIImage imageNamed:@"sample.png"];
cell.cellTitle.text = @"Title";
return cell;


}

不要忘记在编译源选项卡中添加customcell的.m文件

我想创建CustomCell但是它会给出一些错误，如何解决它？错误描述如下

3 个答案: