我有一个UICollectionView嵌套在一个UIViewController中。 collectionView包含了一个由8个控制器标识符组成的数组,这些控制器来自于storyboard。 数组中的每个控制器都继承自持有UICollectionView的UIViewController。
以下是代码:
- (NSInteger)collectionView:(UICollectionView *)collectionView numberOfItemsInSection:(NSInteger)section
{
return _contentPageRestorationIDs.count;
}
- (UICollectionViewCell *)collectionView:(UICollectionView *)collectionView cellForItemAtIndexPath:(NSIndexPath *)indexPath
{
UICollectionViewCell *cell = [collectionView dequeueReusableCellWithReuseIdentifier:@"cell" forIndexPath:indexPath];
BaseContentViewController *contentViewController = (BaseContentViewController *)[self.storyboard instantiateViewControllerWithIdentifier:self.contentPageRestorationIDs[indexPath.row]];
// Set any data needed by the VC here
contentViewController.rootViewController = self;
contentViewController.view.frame = cell.bounds;
[cell addSubview:contentViewController.view];
return cell;
}
我的问题是我的集合视图滑动性能非常慢。如何提高UICollectionView的性能?当视图控制器不在显示时,它们是否被"销毁"了?
编辑:
根据这里的建议,我已经将我的数组更改为保存视图控制器而不是标识符NSString。
在ViewDidLoad中:
_collectionView.delegate=self;
_collectionView.dataSource=self;
PRzeroVC *zeroVC = [[PRzeroVC alloc]init];
PRoneVC *oneVC = [[PRoneVC alloc]init];
PRtwoVC *twoVC = [[PRtwoVC alloc]init];
PRthreeVC *threeVC = [[PRthreeVC alloc]init];
PRfourVC *fourVC = [[PRfourVC alloc]init];
PRfiveVC *fiveVC = [[PRfiveVC alloc]init];
_base = [[BaseContentViewController alloc]init];
_pages = [[NSArray alloc]initWithObjects:zeroVC,oneVC,twoVC,threeVC,fourVC,fiveVC, nil];
[_collectionView reloadData];
- (UICollectionViewCell *)collectionView:(UICollectionView *)collectionView cellForItemAtIndexPath:(NSIndexPath *)indexPath
{
UICollectionViewCell *cell = (UICollectionViewCell *)[collectionView dequeueReusableCellWithReuseIdentifier:@"cell" forIndexPath:indexPath];
cell.layer.shouldRasterize = YES;
cell.layer.rasterizationScale = [UIScreen mainScreen].scale;
_base = (BaseContentViewController *)_pages[indexPath.row];
_base.rootViewController = self;
_base.view.frame = cell.bounds;
[cell addSubview:_base.view];
return cell;
}
我的手机无法显示视图。有什么想法为什么会这样?
UIPageViewController
或者子视图控制器来完成吗? - derpoliuk