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How to dynamically resize UITableViewCell height
(4 answers)
Closed 9 years ago.
I have a UITextView in all the cells of a UITableview. The text view's height is increasing dynamically. As the text view size increases, I would like to increase that cell's height.
I am writing as
-(BOOL)textView:(UITextView *)textView1 shouldChangeTextInRange:(NSRange)range replacementText:(NSString *)text
{
NSLog(#"textTag%d",textView1.tag);
NSString *stringToSave = [textView1.text stringByReplacingCharactersInRange:range withString:text];
NSLog(#"Save me: %#", stringToSave);
CGFrame*frame =textView1.frame;
frame.size.height = textView1.contentSize.height;
textView1.frame = frame;
//HERE I NEED TO INCREASE THE HIGHT FOR THE PARTICULAR CELL.
if([text isEqualToString:#"\n"])
{
[textView1 resignFirstResponder];
}
return YES;
}
insert these lines:
//class variable, type float
newHeight = textView1.contentSize.height;
//class variable, type int
cellIndex = /*set index of your cell for which you want extended height*/
[yourTable reloadData];
below these lines:
CGFrame*frame =textView1.frame;
frame.size.height = textView1.contentSize.height;
textView1.frame = frame;
And in heightForRowAtIndexPath method
-(CGFloat)tableView:(UITableView *)tableView heightForRowAtIndexPath:(NSIndexPath *)indexPath
{
if(indexPath.row == cellIndex)
{
return newHeight;
}
return regularHeigh;
}
Add a custom growing TextView called HPGrowingTextView to your cell .
Then change the height of the cell as shown in the question
Change the UITableViewCell Height According to Amount of Text
I think you could map the heights of the cells in a NSMutableArray.
The array will contain the standard heights that you have.
You can tag the UITextView with the indexPath.row so you know which item to load from the array.
And you can override the value from the array according with the textview's height.
Then in your
-(CGFloat)tableView:(UITableView *)tableView heightForRowAtIndexPath:(NSIndexPath *)indexPath
{
return [[mycellsizearray objectAtIndex:indexPath.row]floatValue];
}
Now you should have the heights according with your needs.
Related
1.When the content inside the cell is too long, cell expansion, Or then shrink, UITableView will scroll to the back of the cell position.
2.I want cell to roll back to where it started expansion.
my code:
((PartnershipsTableViewCell *)cell).commentSpreadButtonClickHandler = ^() {
// just call - (CGFloat)tableView:(UITableView *)tableView heightForRowAtIndexPath:(NSIndexPath *)indexPath
[weakSelf.tableView beginUpdates];
[weakCell configUI];
[weakSelf.tableView endUpdates];
// if here use "[weakSelf.tableView reloadData]",
// it can be correct,
// Unless on the first cell which have the expansion button.
};
then update uitableview cell's height. but the result isn't what i want
- (void)configUI {
if ([self.baseModel isKindOfClass: [UserWorldDynamicModel class]]) {
self.model = (id)self.baseModel;
}
[self setupValue];
}
- (void)setupValue {
// setup the property value, and update the constraints with masonry
}
// the button : read less or read more
- (void)setSpreadButton {
NSString *text = self.model.isContentOpen ? #"read less" : #"read more";
if (!self.spreadButton) {
self.spreadButton = [MYSUtil createButtonWithTitle: text target: self sel: #selector(spreadButtonClick:) image: nil font: Font14 color: DarkBlueTextColor cornerRadius: 0];
self.spreadButton.contentHorizontalAlignment = UIControlContentHorizontalAlignmentLeft;
}
if (self.model.shouldShowSpreadButton) {
if (!self.spreadButton.superview) {
[self.whiteBackgroudView addSubview: self.spreadButton];
}
[self.spreadButton setTitle: text forState: UIControlStateNormal];
self.spreadButton.selected = [self.model.isSpreadState intValue];
self.spreadButton.frame = CGRectMake(CGRectGetMinX(self.contentLabel.frame), CGRectGetMaxY(self.contentLabel.frame), 80, 30);
self.tempView = self.spreadButton;
} else {
if (self.spreadButton.superview) {
[self.spreadButton removeFromSuperview];
}
}
}
// calculate the height of the label and compare it with the fixed value
NSMutableAttributedString *string = [self createMutableAttibuteStringWithNSString: text withFont: font];
self.contentLabel.attributedText = string;
// here calculate maxContentLabelHeight with
CGFloat maxContentLabelHeight = self.contentLabel.font.pointSize * (numberOfLines + 1) + 16;
// here calculate the NSMutableAttributedString's height
YYTextContainer *container = [YYTextContainer containerWithSize:CGSizeMake(width, MAXFLOAT)];
YYTextLayout *textLayout = [YYTextLayout layoutWithContainer:container text: string];
CGSize size = textLayout.textBoundingSize;
CGFloat height = size.height;
// then compare the NSMutableAttributedString's height with the fixed value. if true, show the spreadButton
if (height > maxContentLabelHeight) {
self.model.shouldShowSpreadButton = YES;
// storage the real height and temp height, use to calculate the tableView's contentOffset, when cell from expansion state to shrinking state in block.
self.model.contentHeight = height;
self.model.tempContentHeight = maxContentLabelHeight;
}
// if height > maxContentLabelHeight and the property "isContentOpen" of the viewModel, the height value is maxContentLabelHeight, Or not, the height value is height
if (!self.model.isContentOpen && height > maxContentLabelHeight) {
height = maxContentLabelHeight;
}
// no matter cell is expansion state or shrinking state, reset label's frame.
self.contentLabel.frame = CGRectMake(x, CGRectGetMaxY(self.headerImageView.frame) + Margin_Top, width, height);
readMore／ readLess block
before tableView reloadData on mainQueue, record it's contentOffset, Used to calculate the position of the tableView need to scroll. like this:
CGPoint point = weakSelf.tableView.contentOffset;
reloadData : refresh tableView On mainQueue.
when reloadData complete, scroll tableView to the position which expanded. when tableView from expansion state to shrinking state, and the height of expansion state is greater than 70% of the Screen's height, scroll the tableView (70% is ma condition, you can change is according to your condition)
- (UITableViewCell *)tableView:(UITableView *) tableView cellForRowAtIndexPath: (NSIndexPath *) indexPath {
// here is your code
PartnershipsTableViewCell *cell = [tableView dequeueReusableCellWithIdentifier: cellIdentifierString];
[cell config];
((PartnershipsTableViewCell *)cell).spreadButtonClickHandler = ^() {
CGPoint point = weakSelf.tb.contentOffset;
[weakSelf.tb reloadData];
if (!baseModel.isContentOpen && baseModel.contentHeight > SCREEN_HEIGHT * 0.7) {
point.y -= baseModel.contentHeight - baseModel.tempContentHeight;
dispatch_async(dispatch_get_main_queue(), ^{
weakSelf.tb.contentOffset = point;
});
}
};
return cell;
}
- (CGFloat)tableView:(UITableView *) tableView heightForRowAtIndexPath:(NSIndexPath *) indexPath {
return 70;
}
in my issue, I find a another interesting problem, when use the follow method in your code. if your cell have great changes, especially the height of the cell. when you use the method [tableView reloadData], you'd better not use the follow method.
- (CGFloat)tableView:(UITableView *)tableView estimatedHeightForRowAtIndexPath:(NSIndexPath *)indexPath {
return 70;
}
then use the method [tableView reloadData] to refresh UI, tableView will scroll to any position, so I delete it. because, this method use to estimated height of cell, then use to estimate tableView's contentSize, if the height between estimated and actual is bigger difference, use the method [tableView reloadData], will cause the tableView scroll to anywhere.(don't ask me how to know, this is a painful process for me).
I have solved the problem, leave some notes to myself, and for every one, and hope my solution can help you too.
thanks for #pckill and #Theorist, without your suggestion, I can't solve my question so perfect, thank you very much.
#Theorist I have reedited my code in my mind. Perhaps, the readability is better now.
Need the required height of UITextView. sizeThatFits returns bigger, but the correct height than boundingRectWithSize. Why difference exist?
At two places I need to know the height. In cellForRowAtIndexPath and in heightForRowAtIndexPath.
I do not think it is efficient to create always a UITextView in heightForRowAtIndexPath just to know what height is required.
What workaround do you know to calculate height of a UITextView in heightForRowAtIndexPath?
I met similar problem last month for UITableView, and I use boundingRectWithSize to calculate the size, it is actually correct. I then put it into UITextView.
Some mistakes I made:
I forget to set the same font size when calculating and for UITextView
UITextView has margins, I will manually add it in heightForRowAtIndexPath and set textContainerInset to the same one.
Hope it helps you.
-(CGFloat)tableView:(UITableView *)tableView heightForRowAtIndexPath:(NSIndexPath *)indexPath {
NSInteger section = indexPath.section;
NSUInteger axisIndex = section - 2;
yAxis *yAxisObj = self.yAxisInfoArray[axisIndex];
boundingRect = [yAxisObj.yAxisDescription boundingRectWithSize:CGSizeMake(self.descriptionViewWidth, CGFLOAT_MAX)
options:NSStringDrawingUsesLineFragmentOrigin|NSStringDrawingUsesFontLeading
attributes:#{NSFontAttributeName:self.contentFont}
context:nil];
return boundingRect.size.height + TEXT_TOP_MARGIN + TEXT_BOTTOM_MARGIN;
}
-(UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath {
static NSString *cellId = #"ChartDescriptionCell";
ChartDescriptionCell *cell = [tableView dequeueReusableCellWithIdentifier:cellId];
if (!cell) {
cell = [[ChartDescriptionCell alloc] initWithStyle:UITableViewCellStyleDefault reuseIdentifier:cellId];
cell.textView.bounces = NO;
cell.textView.showsHorizontalScrollIndicator = NO;
cell.textView.showsVerticalScrollIndicator = NO;
cell.textView.font = self.contentFont;
cell.textView.textColor = [UIColor colorWithHex:#"#333333"];
cell.textView.textContainerInset = UIEdgeInsetsMake(TEXT_TOP_MARGIN, -5, TEXT_BOTTOM_MARGIN, -5);
}
NSInteger section = indexPath.section;
NSUInteger axisIndex = section - 2;
yAxis *yAxisObj = self.yAxisInfoArray[axisIndex];
cell.textView.text = yAxisObj.yAxisDescription;
}
return cell;
}
boundingRectWithSize returns size for text, so you should manually provide your font.
sizeThatFits returns size of UITextView with this text inside
If you are pointing to iOS 8 and above you can use Dynamic cell height which is very easy. In case of iOS 7 you need some workaround.
Tutorial: http://www.raywenderlich.com/87975/dynamic-table-view-cell-height-ios-8-swift
Related question with nice answer: Using Auto Layout in UITableView for dynamic cell layouts & variable row heights
I'm working on application where i show user comment in UILable and UILable have sizetofit property. i want to change cell height according to UILable height.
My Question is how i change cell height for example first cell height may be 50, second Cell height may be 100 and so on.
For dynamic height of UITableViewCell you have to do below things
Fulfill all constraint requirement in UITableViewCell
Tell your TableView to dynamically layout Height of every Cell with below code
- (void)viewDidLoad {
[super viewDidLoad];
// two magic lines
tableView.estimatedRowHeight = 89
tableView.rowHeight = UITableView.automaticDimension
}
With just two lines of code, you instruct the table view to calculate the cell’s size matching its content and render it dynamically. This self sizing cell feature should save you tons of code and time. You’re gonna love it.
Hope this helps you by tableview methods:
- (CGFloat)tableView:(UITableView *)tableView heightForRowAtIndexPath:(NSIndexPath *)indexPath
{
return UITableViewAutomaticDimension;
}
You can use this method for increase UITableViewCell height dynamically (No AutoLayout)
- (CGFloat)tableView:(UITableView *)tableView heightForRowAtIndexPath:(NSIndexPath *)indexPath{
NSMutableAttributedString *strName = [[NSMutableAttributedString alloc] initWithString:[NSString stringWithFormat:#"%#",strItemName]];
[strName addAttribute:NSFontAttributeName value:[UIFont systemFontOfSize:16] range:NSMakeRange(0, strItemName.length)];
CGSize sizeItemName = CGRectIntegral([strName boundingRectWithSize:CGSizeMake(130, MAXFLOAT) options:NSStringDrawingUsesLineFragmentOrigin context:nil]).size;
int padding = 5;
//your default cell height for ex 55
if (sizeItemName.height < 55)
{
sizeItemName.height = 55;
}
return sizeItemName.height + padding;
}
In your heightForRowAtIndexPath, calculate the dynamic height based on the related cell data.
- (CGFloat)tableView:(UITableView *)tableView heightForRowAtIndexPath:(NSIndexPath *)indexPath
{
NSDictionary *data = [self.dataSource objectAtIndex:indexPath.row];
return [MyTableViewCell heightForData:data];
}
Then in your MyTabLeViewCell, write a function as below, let us say the data has the "content" which is the fact for dynamic height. And your tableViewCell defined a UILabel called contentLabel with CONTENT_LABEL_WIDTH
+(CGFloat) heightForData : (NSDictionary *)data{
self.contentLabel.text = [data objectForKey:#"content"];
CGSize contentLabelSize = [self.contentLabel sizeThatFits:CGSizeMake(CONTENT_LABEL_WIDTH, CGFLOAT_MAX)];
return contentLabelSize.height;
//If you want to have a minimum cell height no matter how small your content is, you can use below fmaxf with a pre-defined CELL_MIN_HEIGHT value.
// return fmaxf(CELL_MIN_HEIGHT, height);
}
I have a UITextView in a UITableViewCell in the storyboard. I then added a constraint on all 4 sides of the UITextView.
In the code below I tried making the textView dynamically change as the user enters text. I'm pretty sure that worked successfully. But the problem is the cell is not. Bellow is the code I tried, without success.
-(void)viewDidLoad
{
tableView.rowHeight = UITableViewAutomaticDimension;
tableView.estimatedRowHeight = 44;
}
- (BOOL)textView:(UITextView *)textView shouldChangeTextInRange:(NSRange)range replacementText:(NSString *)text
{
if (textView == myTextView)
{
[self textViewFitToContent:myTextView];
[self.tableView beginUpdates];
[self.tableView reloadRowsAtIndexPaths:#[[NSIndexPath indexPathForItem:1 inSection:0]] withRowAnimation:UITableViewRowAnimationNone];
[self.tableView endUpdates];
}
return YES;
}
- (void)textViewFitToContent:(UITextView *)textView
{
CGFloat fixedWidth = textView.frame.size.width;
CGSize newSize = [textView sizeThatFits:CGSizeMake(fixedWidth, MAXFLOAT)];
CGRect newFrame = textView.frame;
newFrame.size = CGSizeMake(fmaxf(newSize.width, fixedWidth), newSize.height);
textView.frame = newFrame;
textView.scrollEnabled = NO;
}
- (CGFloat)tableView:(UITableView *)tableView heightForRowAtIndexPath:(NSIndexPath *)indexPath
{
return myTextView.frame.size.height + 40;
}
I'm a beginner so please don't be too harsh on me.
Thanks
Your code is fine, flawless infact and quite well done. Without seeing your declared variables, I believe the reason that the cell isn't resizing is because you're heightForRowAtIndexPath method is returning the height of the wrong UITextView. Instead of txtSymptoms which isn't used anywhere else in the resizing code, you should be using myTextView instead, which, when the user edits the text of, will trigger the tableView to reload.
This snippet of yours:
- (CGFloat)tableView:(UITableView *)tableView heightForRowAtIndexPath:(NSIndexPath *)indexPath
{
return myTextView.frame.size.height + 40;
}
From the rest of your code, myTextView seems to be a special text view that you are adding text to and resizing, but this method uses that larger height for sizing, which is why all of your cells grow taller.
In the storyboard, select your text view and in the size inspector look for the content hugging priority option.
Content hugging priority can range from 0 to 1000.
Keep the content hugging priority of your text view (for vertical section especially) higher than the content hugging priority of the content view of the cell in which the text view resides.
how can i set different height for different rows of custom ui table view cell in ios?
I am trying to change the height depending upon the how much lines there are in my uitextview which is inside my custom uitableview cell.
I tried setting height like this inside my heightForRowAtIndexPath method but it crashes:
PostStreamCell *cell = [tableView cellForRowAtIndexPath:indexPath];
int lines = cell.txtViewMessage.contentSize.height / cell.txtViewMessage.font.lineHeight;
if(lines < 4)
{
return 100;
}
else if(lines == 4)
{
return 100;
}
else{
return 220;
}
You can't use cellForRowAtIndexPath in heightForRowAtIndexPath because the cell does not exist. You must retrieve the text by another way without use the cell.
Try by using the text boundingRectWithSize.. for calculating the size for cell itself .
Something like this :
NSString *text = yourTextView.text;
CGSize size;
NSDictionary *attributesDictionary = [NSDictionary dictionaryWithObjectsAndKeys:
[UIFont fontWithName:#"Helvetica Neue" size:19], NSFontAttributeName,
nil];
CGRect fontSizeFor7 = [text boundingRectWithSize:CGSizeMake(525, 500)
options:NSStringDrawingUsesLineFragmentOrigin
attributes:attributesDictionary
context:nil];
size = fontSizeFor7.size;
return size.height +40;
I suggest you to count
int lines
in
viewDidLoad
method using length of your text field. Then store it in some array and use it values in your
heightForRowAtIndexPath
method. It should look like this
- (CGFloat)tableView:(UITableView *)tableView heightForRowAtIndexPath:(NSIndexPath *)indexPath
{
if (myLinesArray[indexPath.row] =< 4)
{
return 100;
}
else return 220;
}
You are setting the height correctly--however, you probably shouldn't retrieve a cell within heightForRowAtIndexPath by calling cellForRowAtIndexPath, that is unless your cells are already statically created. A bare-bones implementation of heightForRowAtIndexPath (below) doesn't crash, so the problem probably lies elsewhere in your view controller implementation, or elsewhere.
Also noticed that you are dividing by a dynamic value to get the height. Check your PostStreamCell--if the cell object, txtViewMessage, or its font property is nil, then you will be dividing by 0, and that could be causing the crash.
//Very simple implementation to demo changes in height
- (CGFloat) tableView:(UITableView *)tableView heightForRowAtIndexPath:(NSIndexPath *)indexPath
{
if (indexPath.row % 2) {
return 60;
} else {
return 44;
}
}