我正在以编程方式创建一个UICollectionViewController.不,我不想像每个教程那样使用IB和Storyboard.我只想使用普通代码.
这是我在viewDidLoad中的内容：
- // 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];
- Terminating app due to uncaught exception 'NSInvalidArgumentException',reason: 'UICollectionView must be initialized with a non-nil layout parameter'
解决方法
这是我用来初始化
UICollectionViewController：
- - (id)initWithCollectionViewLayout:(UICollectionViewLayout *)layout
您不需要实例化集合视图,控制器将为您执行此操作.调用此框后设置框架,或者您可以覆盖并设置内部框架：
- - (id)initWithCollectionViewLayout:(UICollectionViewLayout *)layout{
- self = [super initWithCollectionViewLayout:layout];
- if (self) {
- // additional setup here if required.
- }
- return self;
- }
我更喜欢使用autolayout约束.
