UICollectionViewController程序崩溃与非nil布局参数错误

问题描述

我以编程方式创建了一个 UICollectionViewController 。不，我不想使用IB和故事板像每一个教程。

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.

这里是我在 viewDidLoad 中的：

// 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];

我实现了所需的委托方法，我仍然得到这个错误：

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：

- (id)initWithCollectionViewLayout:(UICollectionViewLayout *)layout

您不需要实例化collectionView控制器会为你做它。在调用此框架之后设置框架，或者您可以覆盖框架并设置框架：

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;
}

我更喜欢使用约束。

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