Question

我在堆栈上读了很多关于'dequeueReusableCellWithIdentifier'的问题，我尝试了几个答案，我似乎无法修复它。如果有人能找到我的代码中的问题，我将不胜感激

部分代码：

- (NSInteger) tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section
{
return 2;
}
- (NSInteger) numberOfSectionsInTableView:(UITableView *)tableView   
{
return 10;
}



- (UITableViewCell *) tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath

{

static NSString *CellIdentifier = @"Cell";

UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:CellIdentifier];

if (cell == nil)

{

    cell = [[UITableViewCell alloc] initWithStyle:UITableViewCellStyleDefault reuseIdentifier:CellIdentifier];

}

if (indexPath.section == 0)   {

    if (indexPath.row == 0) {

        cell.textLabel.text = [arrayOfQuestion objectAtIndex:indexPath.section];

    }

    else if (indexPath.row == 1) {

        question1 = [[UITextField alloc] initWithFrame: CGRectMake(20, 3, 280, 38) ];

        question1.adjustsFontSizeToFitWidth = YES;

        question1.textColor = [UIColor blackColor];

        question1.font = [UIFont systemFontOfSize:17.0];

        question1.backgroundColor = [UIColor blueColor];

        question1.autocorrectionType = UITextAutocorrectionTypeNo;        // no auto correction support

        question1.autocapitalizationType = UITextAutocapitalizationTypeNone; // no auto capitalization support

        question1.textAlignment = UITextAlignmentRight;

        question1.keyboardType = UIKeyboardTypeDefault; // use the default type input method (entire keyboard)

        question1.returnKeyType = UIReturnKeyDone;

        question1.tag = 0;

//            question1.delegate = self;



        question1.clearButtonMode = UITextFieldViewModeUnlessEditing; // no clear 'x' button to the right



        [question1 setEnabled: YES ];

        [cell addSubview: question1 ];

    }

}

else if (indexPath.section == 1) {

    if (indexPath.row == 0) {

        cell.textLabel.text = [arrayOfQuestion objectAtIndex:indexPath.section];

    }

    else if (indexPath.row == 1) {

        question2 = [ [ UITextField alloc ] initWithFrame: CGRectMake(20, 3, 280, 38) ];

        question2.adjustsFontSizeToFitWidth = YES;

        question2.textColor = [UIColor blackColor];

        question2.font = [UIFont systemFontOfSize:17.0];

        question2.backgroundColor = [UIColor blueColor];

        question2.autocorrectionType = UITextAutocorrectionTypeNo;        // no auto correction support

        question2.autocapitalizationType = UITextAutocapitalizationTypeNone; // no auto capitalization support

        question2.textAlignment = UITextAlignmentRight;

        question2.keyboardType = UIKeyboardTypeDefault; // use the default type input method (entire keyboard)

        question2.returnKeyType = UIReturnKeyDone;

        question2.tag = 1;

        //            listTitleTextField.delegate = self;



        question2.clearButtonMode = UITextFieldViewModeUnlessEditing; // no clear 'x' button to the right



        [question2 setEnabled: YES ];

        [cell addSubview: question2 ];

    }

}

................

return cell;

}

Answer 1

记住dequeueReusableCellWithIdentifier一遍又一遍地重复使用同一个对象来绘制单元格。它比在表视图中为未知行数创建新单元格更有效。这意味着当您下次需要该单元格时添加带有[cell addSubview: ... ];的UITextFields时，它已经将该子视图添加到其视图中。

您最好创建UITableViewCell的子类，其中UITextField已添加并可作为属性访问。然后你可以有两个单元格标识符：一个引用基本UITableViewCell的问题，另一个引用答案，这是你的新子类。

最重要的是，我会通过重构你构建表格单元格的方式来提高代码的灵活性。因为它不是很可扩展，我打赌一个噩梦试图访问答案。

滚动时UITableView单元格分组

1 个答案: