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的UITableViewCell的高度动态调整某些UITextView的大小。
通过保持指向UITextView的指针并将其内容大小保留在heightForRowAtIndexPath中，可以解决此问题，但是当整个表是动态创建的，且行数未知且行数包含UITextView时，这不是可能。
如果我可以在heightForRowAtIndexPath期间调用有问题的单元格会很容易，但是这会导致无限循环并崩溃，因为甚至在创建任何单元格之前都会调用此方法。
还有其他解决方案吗？

我正在为我的单元格使用UITableViewCell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;
}

像这样在 cellForRowAtIndexPath中创建:

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;
        }

仅将高度传递回我的 ViewController中的变量是不好的，因为就像我说的那样，表中可能有多个这些单元格。

谢谢

Answer 1

使用此方法可以动态调整tableviewCell的大小。首先将用户输入存储在NSMutableArray中，然后重新加载表。希望对您有帮助。

-(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;

}