Question

我在UITextfield中将UITableViewCell作为子视图进行整合时遇到了问题。我在项目中使用了以下代码，将UITextField添加为UITableViewCell

中的子视图

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

static NSString *cellIdentifier=@"CellIdentifier";

    UITableViewCell *cell=[tableView dequeueReusableCellWithIdentifier:cellIdentifier];

    if (cell==nil) {
        cell=[[UITableViewCell alloc]initWithStyle:UITableViewCellStyleDefault reuseIdentifier:cellIdentifier];
    }

    if (indexPath.row==languageName) {
        if (langNameTxtFld==nil) {
            langNameTxtFld=[[UITextField alloc]initWithFrame:CGRectMake(50,0, 265, 44)];
            langNameTxtFld.delegate=self;
            [cell addSubview:[self addTextFieldWithText:nil textField:langNameTxtFld placeholder:@"Language Name" returnType:UIReturnKeyNext]];
            }
        }
        else if (indexPath.row==region) {
            if (regionTxtFld==nil) {

            regionTxtFld=[[UITextField alloc]initWithFrame:CGRectMake(50,0, 265, 44)];
            regionTxtFld.delegate=self;
            [cell addSubview:[self addTextFieldWithText:nil textField:regionTxtFld placeholder:[globalPlaceHolderDict valueForKeyPath:@"region_meaning"] returnType:UIReturnKeyNext]];
            }
        } 
        else if (indexPath.row==city) {
            if (cityTxtFld==nil) {

            cityTxtFld=[[UITextField alloc]initWithFrame:CGRectMake(50,0, 265, 44)];
            cityTxtFld.delegate=self;
            [cell addSubview:[self addTextFieldWithText:nil textField:cityTxtFld placeholder:[globalPlaceHolderDict valueForKeyPath:@"city_meaning"] returnType:UIReturnKeyNext]];
            }
        }
        else if (indexPath.row==school) {
            if (schoolsTxtFld==nil) {

            schoolsTxtFld=[[UITextField alloc]initWithFrame:CGRectMake(50,0, 265, 44)];
            schoolsTxtFld.delegate=self;
            [cell addSubview:[self addTextFieldWithText:nil textField:schoolsTxtFld placeholder:[globalPlaceHolderDict valueForKeyPath:@"schools_meaning"] returnType:UIReturnKeyNext]];
            }
        }
        else if (indexPath.row==studies){
            if (studiesTxtFld==nil) {

            studiesTxtFld=[[UITextField alloc]initWithFrame:CGRectMake(50,0, 265, 44)];
            studiesTxtFld.delegate=self;
            [cell addSubview:[self addTextFieldWithText:nil textField:studiesTxtFld placeholder:[globalPlaceHolderDict valueForKeyPath:@"studies_meaning"] returnType:UIReturnKeyNext]];
            }
        }
        else if (indexPath.row==email) {
            if (emailTxtFld==nil) {

            emailTxtFld=[[UITextField alloc]initWithFrame:CGRectMake(50,0, 265, 44)];
            emailTxtFld.delegate=self;
            [cell addSubview:[self addTextFieldWithText:nil textField:emailTxtFld placeholder:[globalPlaceHolderDict valueForKeyPath:@"email"] returnType:UIReturnKeyNext]];
            }
        }

        else if (indexPath.row==passwords){
            if (passwordsTxtFld==nil) {

            passwordsTxtFld=[[UITextField alloc]initWithFrame:CGRectMake(50,0, 265, 44)];
            passwordsTxtFld.delegate=self;
            [cell addSubview:[self addTextFieldWithText:nil textField:passwordsTxtFld placeholder:[globalPlaceHolderDict valueForKeyPath:@"passwords"] returnType:UIReturnKeyNext]];
            }
        }
    }

    cell.backgroundColor=[UIColor whiteColor];

    cell.selectionStyle=UITableViewCellSelectionStyleNone;

    return cell;
}

将TextField添加到Table Cell中我使用了自定义函数，如下所示

 -(id)addTextFieldWithText:(NSString*)text textField:(id)txtFld placeholder:(NSString*)placeholder returnType:(UIReturnKeyType)keyType {
    [txtFld setTextAlignment:UITextAlignmentLeft];
    [txtFld setContentVerticalAlignment:UIControlContentVerticalAlignmentCenter];
    [txtFld setTextColor:[UIColor blackColor]];
    [txtFld setAutocorrectionType:UITextAutocorrectionTypeNo];
    [txtFld setAutocapitalizationType:UITextAutocapitalizationTypeNone];
    [txtFld setEnablesReturnKeyAutomatically:YES];
    [txtFld setClearButtonMode:UITextFieldViewModeWhileEditing];
    [txtFld setReturnKeyType:keyType];
    [txtFld setPlaceholder:placeholder]; 
    [txtFld setFont:[UIFont fontWithName:@"Helvetica" size:18]];
    return txtFld;
}

上面的代码工作正常，我得到输出tableview如下 UITextField within UITableView

UITextField responding to textFieldShouldBeginEditing

但是当我试图滚动UITableView时，UITextField中的占位符值被折叠并显示如下 Placeholder get collapsed

在我尝试输入textField的同时，文本已与占位符文本重叠，如下所示 placeholder text overlaps with textfield text

所以任何有此想法的人都可以帮我解决这个问题。提前谢谢..

Answer 1

你的编程错误。

您正在反复创建一次单元格和分配文本字段，因此它们会相互重叠。

有两种方法可以解决这个问题： -

您可以创建自定义单元格类并在其中声明所有文本字段，只需在此处传递值。
您每次都需要创建单元格。

希望此解决方案可以帮助您。

如果您选择2个

这是代码： -

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

static NSString *cellIdentifier=@"CellIdentifier";

    UITableViewCell *cell=[tableView dequeueReusableCellWithIdentifier:cellIdentifier];

    if (cell==nil) {
        cell=[[UITableViewCell alloc]initWithStyle:UITableViewCellStyleDefault reuseIdentifier:cellIdentifier];


    if (indexPath.row==languageName) {
        if (langNameTxtFld==nil) {
            langNameTxtFld=[[UITextField alloc]initWithFrame:CGRectMake(50,0, 265, 44)];
            langNameTxtFld.delegate=self;
            [cell addSubview:[self addTextFieldWithText:nil textField:langNameTxtFld placeholder:@"Language Name" returnType:UIReturnKeyNext]];
            }
        }
        else if (indexPath.row==region) {
            if (regionTxtFld==nil) {

            regionTxtFld=[[UITextField alloc]initWithFrame:CGRectMake(50,0, 265, 44)];
            regionTxtFld.delegate=self;
            [cell addSubview:[self addTextFieldWithText:nil textField:regionTxtFld placeholder:[globalPlaceHolderDict valueForKeyPath:@"region_meaning"] returnType:UIReturnKeyNext]];
            }
        } 
        else if (indexPath.row==city) {
            if (cityTxtFld==nil) {

            cityTxtFld=[[UITextField alloc]initWithFrame:CGRectMake(50,0, 265, 44)];
            cityTxtFld.delegate=self;
            [cell addSubview:[self addTextFieldWithText:nil textField:cityTxtFld placeholder:[globalPlaceHolderDict valueForKeyPath:@"city_meaning"] returnType:UIReturnKeyNext]];
            }
        }
        else if (indexPath.row==school) {
            if (schoolsTxtFld==nil) {

            schoolsTxtFld=[[UITextField alloc]initWithFrame:CGRectMake(50,0, 265, 44)];
            schoolsTxtFld.delegate=self;
            [cell addSubview:[self addTextFieldWithText:nil textField:schoolsTxtFld placeholder:[globalPlaceHolderDict valueForKeyPath:@"schools_meaning"] returnType:UIReturnKeyNext]];
            }
        }
        else if (indexPath.row==studies){
            if (studiesTxtFld==nil) {

            studiesTxtFld=[[UITextField alloc]initWithFrame:CGRectMake(50,0, 265, 44)];
            studiesTxtFld.delegate=self;
            [cell addSubview:[self addTextFieldWithText:nil textField:studiesTxtFld placeholder:[globalPlaceHolderDict valueForKeyPath:@"studies_meaning"] returnType:UIReturnKeyNext]];
            }
        }
        else if (indexPath.row==email) {
            if (emailTxtFld==nil) {

            emailTxtFld=[[UITextField alloc]initWithFrame:CGRectMake(50,0, 265, 44)];
            emailTxtFld.delegate=self;
            [cell addSubview:[self addTextFieldWithText:nil textField:emailTxtFld placeholder:[globalPlaceHolderDict valueForKeyPath:@"email"] returnType:UIReturnKeyNext]];
            }
        }

        else if (indexPath.row==passwords){
            if (passwordsTxtFld==nil) {

            passwordsTxtFld=[[UITextField alloc]initWithFrame:CGRectMake(50,0, 265, 44)];
            passwordsTxtFld.delegate=self;
            [cell addSubview:[self addTextFieldWithText:nil textField:passwordsTxtFld placeholder:[globalPlaceHolderDict valueForKeyPath:@"passwords"] returnType:UIReturnKeyNext]];
            }
        }
    }
}
    cell.backgroundColor=[UIColor whiteColor];

    cell.selectionStyle=UITableViewCellSelectionStyleNone;

    return cell;
}

Answer 2

正如P.J指出的那样，问题是，您正在将文本字段添加到已经有文本字段的单元格中，从而产生您所看到的效果。

您可以使用

轻松解决此问题

将TAG字段添加为文本字段时，将其添加为子视图，然后在每次重复使用单元格时使用标记删除该文本字段

在标题声明中

#define MY_CUSTOM_TAG "MY_CUSTOM_TAG"


if (cell==nil) 
{
    cell=[[UITableViewCell alloc]initWithStyle:UITableViewCellStyleDefault reuseIdentifier:cellIdentifier];
}
else
{
   // Clear the old textfield before reusing it
   [[cell.contentView viewWithTag:MY_CUSTOM_TAG]removeFromSuperview] ;
}

 if (indexPath.row==languageName) {
  if (langNameTxtFld==nil) {
    langNameTxtFld=[[UITextField alloc]initWithFrame:CGRectMake(50,0, 265, 44)];
    langNameTxtFld.delegate=self;
    langNameTxtFld.tag = MY_CUSTOM_TAG; // Set a tag so it can be later found and removed for reusing this cell
    [cell addSubview:[self addTextFieldWithText:nil textField:langNameTxtFld placeholder:@"Language Name" returnType:UIReturnKeyNext]];
    }
    }
.

.

UITextField在UITableViewCell中无法正常工作

2 个答案: