Question

我正在尝试通过从Storyboard中调用它来将uicollectionview作为子视图添加到名为CollectionSpace的View中。

UIViewController *CollectionVC =[self.storyboard instantiateViewControllerWithIdentifier:@"CollectionVC"];
CollectionVC.view.frame = CGRectMake(CollectionSpace.frame.origin.x-276, CollectionSpace.frame.origin.y-87, CollectionSpace.frame.size.width+2, CollectionSpace.frame.size.height-2);

[CollectionSpace addSubview:CollectionVC.view];

故事板有一个集合视图，其中委托和源，作为uicollectionview已链接到所有者视图控制器。这是代码：

#import "ViewController.h"

@interface ViewController ()

@property (nonatomic, strong) IBOutlet UICollectionView *collectionView; //linked

@end

@implementation ViewController

- (void)viewDidLoad
{
    self.view = [[UIView alloc] initWithFrame:[[UIScreen mainScreen] bounds]];

    UICollectionViewFlowLayout *layout=[[UICollectionViewFlowLayout alloc] init];
    _collectionView=[[UICollectionView alloc] initWithFrame:self.view.frame collectionViewLayout:layout];
    [_collectionView setDataSource:self];
    [_collectionView setDelegate:self];

    [_collectionView registerClass:[UICollectionViewCell class] forCellWithReuseIdentifier:@"cellIdentifier"];
    [_collectionView setBackgroundColor:[UIColor redColor]];

    [self.view addSubview:_collectionView];

    [super viewDidLoad];
    // Do any additional setup after loading the view, typically from a nib.
}

- (NSInteger)collectionView:(UICollectionView *)collectionView numberOfItemsInSection:(NSInteger)section
{
    return 100;
}

// The cell that is returned must be retrieved from a call to -dequeueReusableCellWithReuseIdentifier:forIndexPath:
- (UICollectionViewCell *)collectionView:(UICollectionView *)collectionView cellForItemAtIndexPath:(NSIndexPath *)indexPath
{
    UICollectionViewCell *cell=[collectionView dequeueReusableCellWithReuseIdentifier:@"cellIdentifier" forIndexPath:indexPath];

    cell.backgroundColor=[UIColor greenColor];
    return cell;
}

- (CGSize)collectionView:(UICollectionView *)collectionView layout:(UICollectionViewLayout*)collectionViewLayout sizeForItemAtIndexPath:(NSIndexPath *)indexPath
{
    return CGSizeMake(150, 150);
}

所以这很好用，它加载了uicollectionview，我可以看到细胞。滚动时出现问题。滚动后，应用程序崩溃了。（lldb）

我尝试通过导入视图控制器以不同的方式调用它并启动它：

UICollectionViewFlowLayout *aFlowLayout = [[UICollectionViewFlowLayout alloc] init];
        [aFlowLayout setItemSize:CGSizeMake(200, 140)];
        [aFlowLayout setScrollDirection:UICollectionViewScrollDirectionHorizontal];

        ViewController *CollectionVC = [[ViewController alloc]initWithCollectionViewLayout:aFlowLayout];

但是uicollectionview没有显示出来。知道什么可能导致崩溃吗？

UICollectionView在Scroll（lldb）上崩溃

0 个答案: