Larghezza cella dinamica di UICollectionView in base alla larghezza dell'etichetta

Question

Ho un UICollectionView, che carica le celle dalla cella riutilizzabile, che contiene l'etichetta. Un array fornisce contenuti per tale etichetta. Posso ridimensionare facilmente la larghezza dell'etichetta in base alla larghezza del contenuto con sizeToFit. Ma non posso creare celle per adattarle all'etichetta.

Ecco il codice

- (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; 
} 

Answer 1

Nel sizeForItemAtIndexPath restituire la dimensione del testo

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

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

Answer 2

Checkout sotto codice che potrebbe essere dare molto breve CGSize.

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

    NSString *testString = @"SOME TEXT"; 
    CGSize calCulateSizze =[testString sizeWithAttributes:NULL]; 
    calCulateSizze.width = calCulateSizze.width; 
    calCulateSizze.height = calCulateSizze.height; 
    return calCulateSizze; 
} 

Answer 3

In Swift 3

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

Answer 4

// aggiungere nella vista didload

UICollectionViewFlowLayout *layout = [[UICollectionViewFlowLayout alloc] init]; 
    [layout setScrollDirection:UICollectionViewScrollDirectionHorizontal]; 
    layout.estimatedItemSize = CGSizeMake(self.breadScrumbCollectionView.frame.size.width, 30); 
self.breadScrumbCollectionView.collectionViewLayout = layout;