启用以快速获取sizeForItemAtIndexPath中的集合视图Cell对象

Question

像在Objective中一样，我们可以如下获取Collection View Cell的对象。 与Swift有一些问题

-(void)collectionView:(UICollectionView *)collectionView 
   didSelectItemAtIndexPath:(NSIndexPath *)indexPath {

DatasetCell *datasetCell = 
  (DatasetCell *)[collectionView cellForItemAtIndexPath:indexPath];

[datasetCell replaceHeaderGradientWith:[UIColor skyBlueHeaderGradient]];
datasetCell.backgroundColor = [UIColor skyBlueColor]; }

Answer 1

尝试这个 ：

 func collectionView(collectionView: UICollectionView, didSelectItemAtIndexPath indexPath: NSIndexPath) {

let datasetCell =  collectionView(collectionView, cellForItemAtIndexPath: indexPath) as DatasetCell
datasetCell.backgroundColor = UIColor.blueColor()

}