我创建了一个包含 4 个部分和 3 行的 UITableView，总共 12 行。但
- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath
上面的方法只被调用了 9 次而不是 12 次。为什么会这样？
我的第 4 部分没有构建，但我的第 1 部分被复制为第 4 部分。
请引用我下面的代码
@interface MainViewController : UITableViewController<UITextFieldDelegate,UITableViewDelegate,UITableViewDataSource>
{
}
@end
// Implement viewDidLoad to do additional setup after loading the view, typically from a nib.
- (void)viewDidLoad
{
CGRect frameRect = CGRectMake(0,0,320,460);
UITableView *tableView = [[UITableView alloc] initWithFrame:frameRect
style:UITableViewStyleGrouped];
tableView.delegate = self;
tableView.dataSource = self;
tableView.backgroundColor = [UIColor purpleColor];
tableView.scrollEnabled = YES;
self.view = tableView;
[tableView release];
[super viewDidLoad];
}
- (NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section {
// Return the number of rows in the section.
return 3;
}
- (NSInteger)numberOfSectionsInTableView:(UITableView *)tableView {
// Return the number of sections.
return 4;
}
// Customize the appearance of table view cells.
- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath
{
NSLog(@"CELL IS NIL %i", indexPath.section);
static NSString *CellIdentifier = @"Cell";
UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:CellIdentifier];
if (cell == nil)
{
cell = [[[UITableViewCell alloc] initWithStyle:UITableViewCellStyleDefault reuseIdentifier:CellIdentifier] autorelease];
if (indexPath.section == 0)
{
if(indexPath.row == 0)
{
cell.text = @"Tmail";
UITextField *aField = [[UITextField alloc]initWithFrame:CGRectMake(100,10,200,40)];
aField.placeholder = @"Mandatory";
aField.delegate = self;
aField.textColor = [UIColor blackColor];
[cell addSubview:aField];
[aField release];
}
else if ( indexPath.row == 1 )
{
cell.text = @"English";
UITextField *aField = [[UITextField alloc]initWithFrame:CGRectMake(100,10,200,40)];
aField.placeholder = @"Mandatory";
aField.delegate = self;
aField.textColor = [UIColor blackColor];
[cell addSubview:aField];
[aField release];
}
else
{
cell.text = @"Hindi";
UITextField *aField = [[UITextField alloc]initWithFrame:CGRectMake(100,10,200,40)];
aField.placeholder = @"Mandatory";
aField.delegate = self;
aField.textColor = [UIColor blackColor];
[cell addSubview:aField];
[aField release];
}
}
else if (indexPath.section == 1)
{
if(indexPath.row == 0)
{
cell.text = @"Street";
UITextField *aField = [[UITextField alloc]initWithFrame:CGRectMake(100,10,200,40)];
aField.placeholder = @"Mandatory";
aField.delegate = self;
aField.textColor = [UIColor blackColor];
[cell addSubview:aField];
[aField release];
}
else if ( indexPath.row == 1 )
{
cell.text = @"City";
UITextField *aField = [[UITextField alloc]initWithFrame:CGRectMake(100,10,200,40)];
aField.placeholder = @"Mandatory";
aField.delegate = self;
aField.textColor = [UIColor blackColor];
[cell addSubview:aField];
[aField release];
}
else
{
cell.text = @"State";
UITextField *aField = [[UITextField alloc]initWithFrame:CGRectMake(100,10,200,40)];
aField.placeholder = @"Mandatory";
aField.delegate = self;
aField.textColor = [UIColor blackColor];
[cell addSubview:aField];
[aField release];
}
}
else if (indexPath.section == 2)
{
if(indexPath.row == 0)
{
cell.text = @"Salem";
UITextField *aField = [[UITextField alloc]initWithFrame:CGRectMake(100,10,200,40)];
aField.placeholder = @"Mandatory";
aField.delegate = self;
aField.textColor = [UIColor blackColor];
[cell addSubview:aField];
[aField release];
}
else if ( indexPath.row == 1 )
{
cell.text = @"Samalpatti";
UITextField *aField = [[UITextField alloc]initWithFrame:CGRectMake(100,10,200,40)];
aField.placeholder = @"Mandatory";
aField.delegate = self;
aField.textColor = [UIColor blackColor];
[cell addSubview:aField];
[aField release];
}
else
{
cell.text = @"Chennai";
UITextField *aField = [[UITextField alloc]initWithFrame:CGRectMake(100,10,200,40)];
aField.placeholder = @"Mandatory";
aField.delegate = self;
aField.textColor = [UIColor blackColor];
[cell addSubview:aField];
[aField release];
}
}
else if (indexPath.section == 3)
{
if(indexPath.row == 0)
{
cell.text = @"NOKIA";
UITextField *aField = [[UITextField alloc]initWithFrame:CGRectMake(100,10,200,40)];
aField.placeholder = @"Mandatory";
aField.delegate = self;
aField.textColor = [UIColor blackColor];
[cell addSubview:aField];
[aField release];
}
else if ( indexPath.row == 1)
{
cell.text = @"SAMSUNG";
UITextField *aField = [[UITextField alloc]initWithFrame:CGRectMake(100,10,200,40)];
aField.placeholder = @"Mandatory";
aField.delegate = self;
aField.textColor = [UIColor blackColor];
[cell addSubview:aField];
[aField release];
}
else
{
cell.text = @"SONY";
UITextField *aField = [[UITextField alloc]initWithFrame:CGRectMake(100,10,200,40)];
aField.placeholder = @"Mandatory";
aField.delegate = self;
aField.textColor = [UIColor blackColor];
[cell addSubview:aField];
[aField release];
}
}
}
return cell;
}
最佳答案
实际上，当您滚动时，会创建其他行以防万一您有更多行，因此认为您需要像这样编写此代码，
编辑了一个
- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath
{
NSLog(@"CELL IS NIL %i", indexPath.section);
static NSString *CellIdentifier = @"Cell";
if (cell == nil)
{
CGRect CellFrame = CGRectMake(0, 0, 300, 70);
cell = [[[UITableViewCell alloc] initWithFrame:CellFrame reuseIdentifier:CellIdentifier] autorelease];
CGRect labLabelFrame = CGRectMake(5, 5, 250, 40);
UILabel *lblTemp;
lblTemp = [[UILabel alloc] initWithFrame:labLabelFrame];
lblTemp.tag = 1;
[cell.contentView addSubview:lblTemp];
[lblTemp release];
CGRect textFieldFrame= CGRectMake(200, 5, 120, 30);
UITextField *txt=[[UITextField alloc] initWithFrame:textFieldFrame];
text.tag=2;
[cell.contentView addSubview:txt];
[txt release];
}
UILabel *cellLabel = (UILabel *)[cell viewWithTag:1];
UITextField *aField=(UITextField *)[cell viewWithTag:2];
aField.text=@"";
aField.placeholder=@"";
if (indexPath.section == 0)
{
if(indexPath.row == 0)
{
cellLabel.text = @"Tmail";
aField.placeholder = @"Mandatory";
aField.delegate = self;
aField.textColor = [UIColor blackColor];
}
else if ( indexPath.row == 1 )
{
cellLabel.text = @"English";
aField.placeholder = @"Mandatory";
aField.delegate = self;
aField.textColor = [UIColor blackColor];
}
else
{
cellLabel.text = @"Hindi";
aField.placeholder = @"Mandatory";
aField.delegate = self;
aField.textColor = [UIColor blackColor];
}
}
else if (indexPath.section == 1)
{
if(indexPath.row == 0)
{
cellLabel.text = @"Street";
aField.placeholder = @"Mandatory";
aField.delegate = self;
aField.textColor = [UIColor blackColor];
}
else if ( indexPath.row == 1 )
{
cellLabel.text = @"City";
aField.placeholder = @"Mandatory";
aField.delegate = self;
aField.textColor = [UIColor blackColor];
}
else
{
cellLabel.text = @"State";
aField.placeholder = @"Mandatory";
aField.delegate = self;
aField.textColor = [UIColor blackColor];
}
}
else if (indexPath.section == 2)
{
if(indexPath.row == 0)
{
cellLabel.text = @"Salem";
aField.placeholder = @"Mandatory";
aField.delegate = self;
aField.textColor = [UIColor blackColor];
}
else if ( indexPath.row == 1 )
{
cellLabel.text = @"Samalpatti";
aField.placeholder = @"Mandatory";
aField.delegate = self;
aField.textColor = [UIColor blackColor];
}
else
{
cellLabel.text = @"Chennai";
aField.placeholder = @"Mandatory";
aField.delegate = self;
aField.textColor = [UIColor blackColor];
}
}
else if (indexPath.section == 3)
{
if(indexPath.row == 0)
{
cellLabel.text = @"NOKIA";
aField.placeholder = @"Mandatory";
aField.delegate = self;
aField.textColor = [UIColor blackColor];
}
else if ( indexPath.row == 1)
{
cellLabel.text = @"SAMSUNG";
aField.placeholder = @"Mandatory";
aField.delegate = self;
aField.textColor = [UIColor blackColor];
}
else
{
cellLabel.text = @"SONY";
aField.placeholder = @"Mandatory";
aField.delegate = self;
aField.textColor = [UIColor blackColor];
}
}
return cell;
}
关于ios - UITableView: `tableView:cellForRowAtIndexPath:` 没有为所有行调用，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/5012644/