ios - 根据文本输入动态调整 UITableViewCell 的大小

Question

我正在尝试根据其中包含UITableViewCell的 ' 的高度动态调整某些 ' 的大小UITextView。通过保留指向的指针UITextView并获取其内容大小，有很多解决方案，heightForRowAtIndexPath但是当整个表是用未知数量的行动态创建并且其中未知数量的行包含UITextView' 时，这是不可能的。如果我可以在期间调用有问题的单元格会很容易，heightForRowAtIndexPath但这会导致无限循环和崩溃，因为在创建任何单元格之前调用此方法。还有其他解决方案吗？

我正在UITableViewCell为我的单元格使用一个子类，如下所示：

- (void)initalizeInputView {
    // Initialization code
    self.selectionStyle = UITableViewCellSelectionStyleNone;
    self.textView = [[UITextView alloc] initWithFrame:CGRectZero];
    self.textView.autocorrectionType = UITextAutocorrectionTypeDefault;
    self.textView.autocapitalizationType = UITextAutocapitalizationTypeNone;
    self.textView.textAlignment = NSTextAlignmentRight;
    self.textView.textColor = [UIColor lightBlueColor];
    self.textView.font = [UIFont fontWithName:@"HelveticaNeue-Light" size:17];
    self.textView.autoresizingMask = UIViewAutoresizingFlexibleWidth;
    self.textView.keyboardType = UIKeyboardTypeDefault;
    [self addSubview:self.textView];

    self.textView.delegate = self;
}

- (BOOL)resignFirstResponder {
    if (_delegate && [_delegate respondsToSelector:@selector(tableViewCell:didEndEditingWithLongString:)]) {
        [_delegate tableViewCell:self didEndEditingWithLongString:self.stringValue];
    }
    return [super resignFirstResponder];
}

- (void)setKeyboardType:(UIKeyboardType)keyboardType
{
    self.textView.keyboardType = keyboardType;
}

- (id)initWithStyle:(UITableViewCellStyle)style reuseIdentifier:(NSString *)reuseIdentifier
{
    self = [super initWithStyle:style reuseIdentifier:reuseIdentifier];
    if (self) {
        [self initalizeInputView];
    }
    return self;
}

- (id)initWithCoder:(NSCoder *)aDecoder {
    self = [super initWithCoder:aDecoder];
    if (self) {
        [self initalizeInputView];
    }
    return self;
}

- (void)setSelected:(BOOL)selected {
    [super setSelected:selected];
    if (selected) {
        [self.textView becomeFirstResponder];
    }
}

- (void)setSelected:(BOOL)selected animated:(BOOL)animated {
    [super setSelected:selected animated:animated];
    if (selected) {
        [self.textView becomeFirstResponder];
    }
}

- (void)setStringValue:(NSString *)value {
    self.textView.text = value;
}

- (NSString *)stringValue {
    return self.textView.text;
}

- (void)textViewDidBeginEditing:(UITextView *)textView
{
    // For keyboard scroll
    UITableView *tableView = (UITableView *)self.superview;
    AppSetupViewController *parent = (AppSetupViewController *)_delegate;
    parent.activeCellIndexPath = [tableView indexPathForCell:self];
}

- (void)textViewDidChange:(UITextView *)textView
{
    if (textView.contentSize.height > contentRowHeight) {

        contentRowHeight = textView.contentSize.height;

        UITableView *tableView = (UITableView *)self.superview;
        [tableView beginUpdates];
        [tableView endUpdates];

        [textView setFrame:CGRectMake(0, 0, 300.0, textView.contentSize.height)];
    }
}

- (void)textViewDidEndEditing:(UITextView *)textView
{
    if (_delegate && [_delegate respondsToSelector:@selector(tableViewCell:didEndEditingWithLongString:)]) {
        [_delegate tableViewCell:self didEndEditingWithLongString:self.stringValue];
    }
    UITableView *tableView = (UITableView *)self.superview;
    [tableView deselectRowAtIndexPath:[tableView indexPathForCell:self] animated:YES];
}

- (void)layoutSubviews {
    [super layoutSubviews];
    CGRect editFrame = CGRectInset(self.contentView.frame, 10, 10);

    if (self.textLabel.text && [self.textLabel.text length] != 0) {
        CGSize textSize = [self.textLabel sizeThatFits:CGSizeZero];
        editFrame.origin.x += textSize.width + 10;
        editFrame.size.width -= textSize.width + 10;
        self.textView.textAlignment = NSTextAlignmentRight;
    } else {
        self.textView.textAlignment = NSTextAlignmentLeft;
    }

    self.textView.frame = editFrame;
}

它是cellForRowAtIndexPath这样创建的：

else if ([paramType isEqualToString:@"longString"]) {
            MyIdentifier = @"AppActionLongString";

            LongStringInputTableViewCell *cell = (LongStringInputTableViewCell *)[tableView dequeueReusableCellWithIdentifier:MyIdentifier];
            cell.textLabel.text = [[[_selectedAction objectForKey:@"parameters"] objectAtIndex:indexPath.row] objectForKey:@"name"];
            cell.params = [[_selectedAction objectForKey:@"parameters"] objectAtIndex:indexPath.row];

            cell.textView.text = [results objectAtIndex:indexPath.row];

            return cell;
        }

简单地将高度传递回我的变量ViewController是不好的，因为就像我说的那样，表格中可能有几个这样的单元格。

谢谢

score 1 · Accepted Answer

使用此方法动态调整 tableviewCell 的大小。首先将用户输入存储在 NSMutable 数组中，然后重新加载表。希望它会帮助你。

-(CGFloat)tableView:(UITableView *)tableView heightForRowAtIndexPath:(NSIndexPath *)indexPath{

    NSString *msg =[self.messages objectAtIndex:indexPath.row];
    CGSize  textSize = { 120, 10000.0 };
    CGSize size = [msg sizeWithFont:[UIFont systemFontOfSize:15]
                  constrainedToSize:textSize
                      lineBreakMode:UILineBreakModeWordWrap];


return size.height+20;

}

score 0 · Accepted Answer

我需要一个基于该单元格中显示的文本量的动态表格视图单元格高度。我以这种方式解决了它：

    - (CGFloat)tableView:(UITableView *)tableView heightForRowAtIndexPath:(NSIndexPath *)indexPath
    {
        if (!isLoading)
        {

            if ([self.conditionsDataArray count]>0)
            {
                Conditions *condition =[self.conditionsDataArray objectAtIndex:indexPath.row];

                int height;

                UITextView *textview = [[UITextView alloc] initWithFrame:CGRectMake(0, 0, 236, 0)];   //you can set your frame according to your need

                textview.text  = condition.comment;

                textview.autoresizingMask = UIViewAutoresizingFlexibleHeight;

                [tableView addSubview:textview];

                textview.hidden = YES;

                height = textview.contentSize.height;

                NSLog(@"TEXT VIEW HEIGHT %f", textview.contentSize.height);

                [textview removeFromSuperview];

                [textview release];

                return height;
       }

       return 55;  //Default height, if data is in loading state
}

请注意，文本视图已添加为子视图，然后被隐藏，因此请确保将其添加为子视图，否则将不考虑它的高度。

score 0 · Accepted Answer

如果我可以在 heightForRowAtIndexPath 期间调用有问题的单元格会很容易，但这会导致无限循环和崩溃，因为在创建任何单元格之前调用此方法。还有其他解决方案吗？

你可以。我猜您正在尝试调用cellForRowAtIndexPath，这将导致无限循环。但是您应该通过调用直接将单元格出列dequeueReusableCellWithIdentifier。

请参阅TLIndexPathTools的表视图委托实现。该方法如下所示：heightForRowAtIndexPath

（编辑最初忘记包含prototypeForCellIdentifier实际使单元出列的方法。）

- (CGFloat)tableView:(UITableView *)tableView heightForRowAtIndexPath:(NSIndexPath *)indexPath
{
    id item = [self.dataModel itemAtIndexPath:indexPath];
    NSString *cellId = [self cellIdentifierAtIndexPath:indexPath];
    if (cellId) {
        UITableViewCell *cell = [self prototypeForCellIdentifier:cellId];
        if ([cell conformsToProtocol:@protocol(TLDynamicSizeView)]) {
            id<TLDynamicSizeView> v = (id<TLDynamicSizeView>)cell;
            id data;
            if ([item isKindOfClass:[TLIndexPathItem class]]) {
                TLIndexPathItem *i = (TLIndexPathItem *)item;
                data = i.data;
            } else {
                data = item;
            }
            CGSize computedSize = [v sizeWithData:data];
            return computedSize.height;
        } else {
            return cell.bounds.size.height;
        }
    }

    return 44.0;
}

- (UITableViewCell *)tableView:(UITableView *)tableView prototypeForCellIdentifier:(NSString *)cellIdentifier
{
    UITableViewCell *cell;
    if (cellIdentifier) {
        cell = [self.prototypeCells objectForKey:cellIdentifier];
        if (!cell) {
            if (!self.prototypeCells) {
                self.prototypeCells = [[NSMutableDictionary alloc] init];
            }
            cell = [tableView dequeueReusableCellWithIdentifier:cellIdentifier];
            //TODO this will fail if multiple tables are being used and they have
            //overlapping identifiers. The key needs to be unique to the table
            [self.prototypeCells setObject:cell forKey:cellIdentifier];
        }
    }
    return cell;
}

这使用TLDynamicSizeView任何单元格都可以实现的协议来自动计算其高度。这是一个工作示例项目。该单元的协议实现如下所示：

@implementation DynamicHeightCell

- (void)awakeFromNib
{
    [super awakeFromNib];
    self.originalSize = self.bounds.size;
    self.originalLabelSize = self.label.bounds.size;
}

- (void)configureWithText:(NSString *)text
{
    self.label.text = text;
    [self.label sizeToFit];
}

#pragma mark - TLDynamicSizeView

- (CGSize)sizeWithData:(id)data
{
    [self configureWithText:data];
    //the dynamic size is calculated by taking the original size and incrementing
    //by the change in the label's size after configuring
    CGSize labelSize = self.label.bounds.size;
    CGSize size = self.originalSize;
    size.width += labelSize.width - self.originalLabelSize.width;
    size.height += labelSize.height - self.originalLabelSize.height;
    return size;
}

@end

score -2 · Accepted Answer

-2

只是评论

if (cell == nil)

希望对你有帮助。

于 2013-06-24T13:02:50.620 回答

ios - 根据文本输入动态调整 UITableViewCell 的大小

4 回答 4

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