本文介绍了在第一次加载视图时预选择/突出显示UICollectionViewCell的处理方法，对大家解决问题具有一定的参考价值，需要的朋友们下面随着小编来一起学习吧！
问题描述
我试图在UICollectionView中预先选择第一个对象/ UICollectionViewCell？我试过了：
Im trying to preselect the first object/UICollectionViewCell in the UICollectionView? I have tried:
self.dateCollectionView.allowsMultipleSelection=NO;
[self.dateCollectionView selectItemAtIndexPath:0 animated:YES scrollPosition:UICollectionViewScrollPositionLeft];
[self collectionView:self.dateCollectionView didSelectItemAtIndexPath:0];
[self.dateCollectionView reloadData];
在 viewDidLoad 。
这是我的 UICollectionView 方法;
-(NSInteger)collectionView:(UICollectionView *)collectionView numberOfItemsInSection:(NSInteger)section{
return self.titles.count;
}
-(UICollectionViewCell *)collectionView:(UICollectionView *)collectionView cellForItemAtIndexPath:(NSIndexPath *)indexPath{
UICollectionViewCell * cell = [collectionView dequeueReusableCellWithReuseIdentifier:@"Cell" forIndexPath:indexPath];
cell.backgroundColor= [UIColor clearColor];
UILabel * dateLabel = (UILabel *)[cell viewWithTag:1];
UILabel * subText = (UILabel *)[cell viewWithTag:2];
subText.text=self.titles[indexPath.row];
subText.adjustsFontSizeToFitWidth=YES;
if (cell.selected) {
cell.backgroundColor = [UIColor blueColor]; // highlight selection
}
else
{
cell.backgroundColor = [UIColor redColor]; // Default color
}
return cell;
}
-(void)collectionView:(UICollectionView *)collectionView didSelectItemAtIndexPath:(NSIndexPath *)indexPath {
UICollectionViewCell *datasetCell =[collectionView cellForItemAtIndexPath:indexPath];
datasetCell.backgroundColor = [UIColor blueColor]; // highlight selection
}
-(void)collectionView:(UICollectionView *)collectionView didDeselectItemAtIndexPath:(NSIndexPath *)indexPath {
UICollectionViewCell *datasetCell =[collectionView cellForItemAtIndexPath:indexPath];
datasetCell.backgroundColor = [UIColor redColor]; // Default color
}
- (BOOL)collectionView:(UICollectionView *)collectionView
shouldHighlightItemAtIndexPath:(NSIndexPath *)indexPath
{
return YES;
}
- (BOOL)collectionView:(UICollectionView *)collectionView
shouldSelectItemAtIndexPath:(NSIndexPath *)indexPath;
{
return YES;
}
推荐答案
在 viewDidAppear ：
NSIndexPath *indexPathForFirstRow = [NSIndexPath indexPathForRow:0 inSection:0];
[self.dateCollectionView selectItemAtIndexPath:indexPathForFirstRow animated:NO scrollPosition:UICollectionViewScrollPositionNone];
[self collectionView:self.dateCollectionView didSelectItemAtIndexPath:indexPathForFirstRow];
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