UICollectionViewController 以编程方式因非零布局参数错误而崩溃 [英] UICollectionViewController Programmatically crashing with non-nil layout parameter error
问题描述
我正在以编程方式创建 UICollectionViewController
.不,我不想像每个教程一样使用 IB 和 Storyboard.我只想使用纯代码.
I am creating a UICollectionViewController
programmatically. No, I don't want to use IB and Storyboards like every tutorial out there. I just want to use plain code.
这是我的 viewDidLoad
中的内容:
Here is what I have in my viewDidLoad
:
// UICollectionView
UICollectionViewFlowLayout *aFlowLayout = [[UICollectionViewFlowLayout alloc] init];
[aFlowLayout setItemSize:CGSizeMake(200, 140)];
[aFlowLayout setScrollDirection:UICollectionViewScrollDirectionVertical];
self.collectionView = [[UICollectionView alloc] initWithFrame:self.view.frame collectionViewLayout:aFlowLayout];
[self.collectionView setDelegate:self];
[self.collectionView setDataSource:self];
self.collectionView.backgroundColor = [UIColor clearColor];
[self.collectionView setAutoresizingMask:UIViewAutoresizingFlexibleHeight | UIViewAutoresizingFlexibleLeftMargin | UIViewAutoresizingFlexibleRightMargin | UIViewAutoresizingFlexibleWidth];
[self.collectionView registerClass:[PUCImageGridCell class] forCellWithReuseIdentifier:CollectionViewCellIdentifier];
我已经实现了所需的委托方法,但我仍然收到此错误:
I have implemented the required delegate methods and I still get this error:
Terminating app due to uncaught exception 'NSInvalidArgumentException', reason: 'UICollectionView must be initialized with a non-nil layout parameter'
推荐答案
这是我用来初始化一个 UICollectionViewController:
This is what I use to initialize a UICollectionViewController:
- (id)initWithCollectionViewLayout:(UICollectionViewLayout *)layout
您不需要实例化collectionView,控制器会为您完成.在调用它之后设置框架,或者您可以覆盖并设置内部框架:
You do not need to instantiate the collectionView the controller will do it for you. Set the frame after calling this or you can override and set the frame inside:
- (id)initWithCollectionViewLayout:(UICollectionViewLayout *)layout{
self = [super initWithCollectionViewLayout:layout];
if (self) {
// additional setup here if required.
}
return self;
}
我更喜欢使用 自动布局 约束.
I prefer to use the autolayout constraints.
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