xcode 控制台错误：UICollectionView 必须使用非 nil 布局参数进行初始化
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Console error: UICollectionView must be initialized with a non-nil layout parameter
提问by SDW
I'm new to UICollectionViewand I'm following a tutorial that I found on Youtube, but i'm stuck on an error I can't figure out.
我是新手UICollectionView，我正在学习我在 Youtube 上找到的教程，但我遇到了一个我无法弄清楚的错误。
When I run the app with this code:
当我使用此代码运行应用程序时：
-(NSInteger)numberOfSectionsInCollectionView:(UICollectionView *)collectionView {
return 1;
}
-(NSInteger)collectionView:(UICollectionView *)collectionView numberOfItemsInSection:(NSInteger)section {
return [self.array count];
}
-(UICollectionViewCell *)collectionView:(UICollectionView *)collectionView cellForItemAtIndexPath:(NSIndexPath *)indexPath {
CollectionCell *aCell = (CollectionCell *)[collectionView dequeueReusableCellWithReuseIdentifier:@"myCell" forIndexPath:indexPath];
aCell.title.text = self.array[indexPath.row];
return aCell;
}
- (void)viewDidLoad
{
[super viewDidLoad];
self.array = @[@"First", @"Second", @"Thirth", @"Fourth"];
}
And in the .h:
在 .h 中：
@property (strong, nonatomic) NSArray *array;
In the console I receive the following error:
在控制台中，我收到以下错误：
Terminating app due to uncaught exception 'NSInvalidArgumentException', reason: 'UICollectionView must be initialized with a non-nil layout parameter'
Im NOT using storyboard, and custom maked the CollectionView what you can see here:
我没有使用故事板，而是自定义了 CollectionView 您可以在这里看到的内容：
Does anyone have any ideas why i'm getting this error? Everything is welcome!
有没有人知道为什么我会收到这个错误？一切都欢迎！
edit:
编辑：
- (void)viewDidLoad
{
[super viewDidLoad];
self.array = @[@"First", @"Second", @"Thirth", @"Fourth"];
[self.collectionView registerClass:[UICollectionViewCell class] forCellWithReuseIdentifier:@"myCell"];
UICollectionViewFlowLayout *flow = [[UICollectionViewFlowLayout alloc] init];
[flow setItemSize:CGSizeMake(60, 60)];
[flow setScrollDirection:UICollectionViewScrollDirectionVertical];
[self.collectionView setCollectionViewLayout:flow];
}
回答by Saurabh Singh
it is an error while registering the uicollectionviewcell view class. To resolve put the below line in your code:
注册 uicollectionviewcell 视图类时出错。要解决将以下行放在您的代码中：
[self.collectionView registerClass:[UICollectionViewCell class] forCellWithReuseIdentifier:@"myCell"];
回答by MS.
Register Collection cell in viewDidLoadmethod ::
在viewDidLoad方法中注册集合单元::
[self.collView registerClass:[mineCell class] forCellWithReuseIdentifier:@"cvCell"];
Try this after above line:
在上面的行之后试试这个：
UICollectionViewFlowLayout *flow = [[UICollectionViewFlowLayout alloc] init];
[flow setItemSize:CGSizeMake(60, 60)];
[flow setScrollDirection:UICollectionViewScrollDirectionVertical];
[self.collView setCollectionViewLayout:flow];
Here, mineCellis my custom collectionViewCell or you can use [UICollectionViewCell class]directly.
这里，mineCell是我自定义的 collectionViewCell 或者你可以[UICollectionViewCell class]直接使用。
Thanks.
谢谢。
