根据文本量更改 UITableViewCell 高度

Its simple, just add this to your code:

- (CGFloat)tableView:(UITableView *)tableView heightForRowAtIndexPath:(NSIndexPath *)indexPath
{
    return UITableViewAutomaticDimension;
}

It automatically count an height of row and than return a float... :-)

Hope this helps!

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Hi Josh,

Using tableView:heightForRowAtIndexPath: you can give the size of each row at run time. now your problem is how to get height from your string there are function in NSString class by this code your problem,

-(CGFloat)tableView:(UITableView *)tableView heightForRowAtIndexPath:(NSIndexPath *)indexPath
{
  NSString *str = [dataSourceArray objectAtIndex:indexPath.row];
    CGSize size = [str sizeWithFont:[UIFont fontWithName:@"Helvetica" size:17] constrainedToSize:CGSizeMake(280, 999) lineBreakMode:NSLineBreakByWordWrapping];
    NSLog(@"%f",size.height);
    return size.height + 10;
}

by below line you set your label`s num. of line to max. so set it in cellForRowAtIndexPath: method.

cell.textLabel.numberOfLines = 0;

if you use some custom cell then manage all label`s string with this and get sum of all that height then set the height of your cell.

Edit : iOS 8 onwards if you set proper autolayout constraints to label then you have to set only following delegate method to achieve this.

-(CGFloat)tableView:(UITableView *)tableView estimatedHeightForRowAtIndexPath:(NSIndexPath *)indexPath {
   //minimum size of your cell, it should be single line of label if you are not clear min. then return UITableViewAutomaticDimension;    
   return UITableViewAutomaticDimension; 
}
- (CGFloat)tableView:(UITableView *)tableView heightForRowAtIndexPath:(NSIndexPath *)indexPath
{
    return UITableViewAutomaticDimension;
}

that`s it. no any calculation required. For more information check this tutorial.

---

In your CustomCell: Remember to add the constraint top and bottom for your UILabel

For adjust UILabel height depend on text just change UILabel line to 0 (see the answer here)

Then in your code, just only set 2 line

self.tableView.estimatedRowHeight = 80;
self.tableView.rowHeight = UITableViewAutomaticDimension;

https://i.stack.imgur.com/vxUt0.png

https://i.stack.imgur.com/ccZVL.png

=== Suggestion ===
IF your cell has some UILabels and Images (not like my example) then:

You should put all UILabels and Images to one GroupView (View)

Add the constraint top and bottom to supper view for this GroupView (like the UILabel in my image)

Adjust UILabel height like the my suggestion above

Adjust the GroupView height depend on the content (the content is all UILabels and Images)

Finally, change estimateRowHeight and tableView.rowHeight like the code above

Hope this help

---

Based on the code you have provided, I think you are increasing only the cell height and not the cell.textLabel's height.

Ideally, you should set the frame size of cell.textLabel and the cell for you to see the full text in the cell.

A neat way to see whats wrong with a view in terms of size, is to color it different than the background (try setting cell.textLabel background to yellow) and see if the height is actually being set.

Here's how it should be

UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:CellIdentifier];
if (cell == nil) {
    cell = [[[UITableViewCell alloc] initWithStyle:UITableViewCellStyleDefault reuseIdentifier:CellIdentifier] autorelease];
    cell.textLabel.lineBreakMode = NSLineBreakByWordWrapping;
    cell.textLabel.numberOfLines = 0;
    cell.textLabel.font = [UIFont fontWithName:@"Helvetica" size:17.0];

    NSString *cellText = @"Go get some text for your cell.";
    UIFont *cellFont = cell.textLabel.font;
    CGSize constraintSize = CGSizeMake(280.0f, MAXFLOAT);
    CGSize labelSize = [cellText sizeWithFont:cellFont constrainedToSize:constraintSize lineBreakMode:UILineBreakModeWordWrap];
    cell.textlabel.frame.size = labelSize; 
    cell.text = cellText;
}

Hope this helps!

update: This is quite an old answer, and many lines in this answer may be deprecated.

---

For swift developers:

Custom cell: At first you can calculate the height of the text like below:

func calculateHeight(inString:String) -> CGFloat
    {
        let messageString = inString
        let attributes : [String : Any] = [NSFontAttributeName : UIFont.systemFont(ofSize: 15.0)]

        let attributedString : NSAttributedString = NSAttributedString(string: messageString, attributes: attributes)

        let rect : CGRect = attributedString.boundingRect(with: CGSize(width: 222.0, height: CGFloat.greatestFiniteMagnitude), options: .usesLineFragmentOrigin, context: nil)

        let requredSize:CGRect = rect
        return requredSize.height
    }

Set the width of your text label

Then call this function:

func tableView(_ tableView: UITableView, heightForRowAt indexPath: IndexPath) -> CGFloat {
        heightOfRow = self.calculateHeight(inString: conversations[indexPath.row].description)

        return (heightOfRow + 60.0)
}

For Basic cell:

func tableView(_ tableView: UITableView, heightForRowAt indexPath: IndexPath) -> CGFloat {
           return UITableViewAutomaticDimension
    }

This function will not work for custom cells.

Hope it will work.

---

In tableView:heightForRowAtIndexPath: you can take the text and use sizeWithFont:constrainedToSize: in order to get the size of the text.

Then just return the height plus some extra spacing for buffer.

---

You can write a method globally to make it so it can be used throughout the app. You need to pass the text, font and width as per your requirement.

In Swift 4:

func heightForText(text: String,Font: UIFont,Width: CGFloat) -> CGFloat{

    let constrainedSize = CGSize.init(width:Width, height: CGFloat(MAXFLOAT))

    let attributesDictionary = NSDictionary.init(object: Font, forKey:NSAttributedStringKey.font as NSCopying)

    let mutablestring = NSAttributedString.init(string: text, attributes: attributesDictionary as? [NSAttributedStringKey : Any])

    var requiredHeight = mutablestring.boundingRect(with:constrainedSize, options: NSStringDrawingOptions.usesFontLeading.union(NSStringDrawingOptions.usesLineFragmentOrigin), context: nil)

    if requiredHeight.size.width > Width {
        requiredHeight = CGRect.init(x: 0, y: 0, width: Width, height: requiredHeight.height)

    }
    return requiredHeight.size.height;
}

---

I was able to get this accomplished using autolayout. Make sure your label snaps to the top and bottom of the cell (I'm using a prototype cell), and it's lines set to 0. Then in the tableView:heightForRowAtIndexPath:sizeWithFont:constrainedToSize: you can set the height of the cell by doing the calculation on the text size:

NSString *key = self.detailContent.allKeys[indexPath.row];
NSDictionary *dictionary = self.detailContent[key];
NSString *cellText = dictionary[kSMDetailTableViewCellTextKey];
UIFont *cellFont = [UIFont fontWithName:kFontKeyEmondsans size:12.0];
CGSize constraintSize = CGSizeMake(252.0f, MAXFLOAT);
CGSize labelSize = [cellText sizeWithFont:cellFont constrainedToSize:constraintSize lineBreakMode:NSLineBreakByWordWrapping];
return labelSize.height;// + 10;

---

NSString *str;
NSArray* dictArr;

if (_index==0) {
    dictArr = mustangCarDetailDictArr[indexPath.section];

}

NSDictionary* dict = dictArr[indexPath.row];


if (indexPath.section ==0)
{

    str = [dict valueForKey:@"FeatureName"];
    if ([[dict valueForKey:@"FeatureDetail"] isKindOfClass:[NSString class]])
    {

        str = [dict valueForKey:@"FeatureDetail"];



    }
    else
    {
        if (dictArr.count>indexPath.row+1)
        {
            NSDictionary* dict2 = dictArr[indexPath.row+1];
            if ([[dict2 valueForKey:@"FeatureDetail"] isKindOfClass:[NSString class]])
            {


            }
        }

    }


}
CGSize size = [str sizeWithFont:[UIFont fontWithName:@"Helvetica" size:17] constrainedToSize:CGSizeMake(280, 999) lineBreakMode:NSLineBreakByWordWrapping];
NSLog(@"%f",size.height);
return size.height + 20;


}

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