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I have a UICollectionView, that loads cells from reusable cell, which contains label. An array provides content for that label. I can resize label width depending on content width easily with sizeToFit. But I cannot make cell to fit label.

Here's the code

- (void)viewDidLoad

 [super viewDidLoad];
 // Do any additional setup after loading the view, typically from a nib.
 arrayOfStats = @[@"time:",@"2",@"items:",@"10",@"difficulty:",@"hard",@"category:",@"main"];


- (NSInteger)collectionView:(UICollectionView *)collectionView numberOfItemsInSection: (NSInteger)section
 return [arrayOfStats count];


- (CGSize)collectionView:(UICollectionView *)collectionView layout:(UICollectionViewLayout*)collectionViewLayout sizeForItemAtIndexPath:(NSIndexPath *)indexPath

 return CGSizeMake(??????????);


- (NSInteger)numberOfSectionsInCollectionView:(UICollectionView *)collectionView

 return 1;


- (UICollectionViewCell *)collectionView:(UICollectionView *)collectionView cellForItemAtIndexPath:(NSIndexPath *)indexPath

 Cell *cell = (Cell *) [collectionView dequeueReusableCellWithReuseIdentifier:@"qw" forIndexPath:indexPath];
 cell.myLabel.text = [NSString stringWithFormat:@"%@",[arrayOfStats objectAtIndex:indexPath.item]];
 // make label width depend on text width
 [cell.myLabel sizeToFit];

 //get the width and height of the label (CGSize contains two parameters: width and height)
 CGSize labelSize = cell.myLbale.frame.size;

 NSLog(@"n width = %f height = %f", labelSize.width,labelSize.height);

 return cell;

In sizeForItemAtIndexPath return the size of the text

- (CGSize)collectionView:(UICollectionView *)collectionView layout:(UICollectionViewLayout*)collectionViewLayout sizeForItemAtIndexPath:(NSIndexPath *)indexPath

 return [(NSString*)[arrayOfStats objectAtIndex:indexPath.row] sizeWithAttributes:NULL];

Checkout below code you might be giving very short CGSize.

- (CGSize)collectionView:(UICollectionView *)collectionView layout:(UICollectionViewLayout*)collectionViewLayout sizeForItemAtIndexPath:(NSIndexPath *)indexPath

 NSString *testString = @"SOME TEXT";
 return [testString sizeWithAttributes:NULL];

In Swift 3

let size = (arrayOfStats[indexPath.row] as NSString).size(attributes: nil)

Swift 4.2+

Principle is:

1. Implement UICollectionViewDelegateFlowLayout (it contains necessary method signature)




2. Call collectionView...sizeForItemAt method.




3. No need to bridge-cast String to NSString to call size(withAttributes: method. Swift String has it out of the box.




4. Attributes are the same you set for (NS)AttributedString, i.e. font family, size, weight, etc. Optional parameter.

Sample solution:

extension ViewController: UICollectionViewDelegateFlowLayout 
 func collectionView(_ collectionView: UICollectionView, layout collectionViewLayout: UICollectionViewLayout, sizeForItemAt indexPath: IndexPath) -> CGSize 
 return "String".size(withAttributes: nil)
 

But you would most likely want to specify concrete string attributes respective to your cell, hence final return would look like:

// Replace "String" with proper string (typically array element). 
return "String".size(withAttributes: [
 NSAttributedString.Key.font : UIFont.boldSystemFont(ofSize: 14)
])

Swift 4

let size = (arrayOfStats[indexPath.row] as NSString).size(withAttributes: nil)

I have found a small trick for swift 4.2

For dynamic width & fixed height:

func collectionView(_ collectionView: UICollectionView, layout collectionViewLayout: UICollectionViewLayout, sizeForItemAt indexPath: IndexPath) -> CGSize 
 let label = UILabel(frame: CGRect.zero)
 label.text = textArray[indexPath.item]
 label.sizeToFit()
 return CGSize(width: label.frame.width, height: 32)
 

For dynamic height & fixed width:

func collectionView(_ collectionView: UICollectionView, layout collectionViewLayout: UICollectionViewLayout, sizeForItemAt indexPath: IndexPath) -> CGSize 
 let label = UILabel(frame: CGRect.zero)
 label.text = textArray[indexPath.item]
 label.sizeToFit()
 return CGSize(width: 120, height: label.frame.height)