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并在heightForRowAtIndexPath中获取内容大小的指针来解决这个问题，但是当整个表是动态创建的，行数未知且行数未知时包含UITextView这是不可能的。
如果我可以在heightForRowAtIndexPath期间调用有问题的单元格，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会很容易。
还有其他解决方案吗？
我正在为我的单元格使用UITableViewCell子类：
- (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;
}
在cellForRowAtIndexPath中创建了这样的内容：
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;
}
简单地将高度传回我ViewController中的变量并不好，因为就像我说的那样，表格中可能有几个单元格。
由于
答案 0 :(得分：1)
使用此方法动态调整tableviewCell的大小。首先将用户输入存储在NSMutable Array中，然后再存储在重载表之后。希望它会对你有所帮助。
-(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;
}
答案 1 :(得分：0)
我需要一个基于要在该单元格中显示的文本量的动态表格视图单元格高度。我用这种方式解决了它：
- (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，然后隐藏，因此请确保将其添加为SubView，否则将不会考虑它的高度。
答案 2 :(得分：0)
如果我可以在heightForRowAtIndexPath期间调用有问题的单元格，但这会导致无限循环并崩溃，因为在创建任何单元格之前调用此方法会很容易。还有其他解决方案吗？
你可以。我猜你试图调用cellForRowAtIndexPath，这将导致无限循环。但是你应该通过调用dequeueReusableCellWithIdentifier直接将单元格出列。
查看table view delegate implementation的TLIndexPathTools。 heightForRowAtIndexPath方法如下所示：
（编辑最初忘记包含实际使单元格出列的方法prototypeForCellIdentifier。）
- (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;
}
这使用任何单元格可以实现的协议TLDynamicSizeView来自动计算其高度。这是一个有效的example project。该单元的协议实现如下：
@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
答案 3 :(得分：-2)
只是评论
if (cell == nil)
希望，这会对你有帮助。