以编程方式创建UICollectionView [英] Creating a UICollectionView programmatically

问题描述

我正在寻找一个指南或教程，它将告诉我如何只使用代码设置一个简单的UICollectionView。

Im looking for a guide or tutorial that will show me how to set up a simple UICollectionView using only code.

Im通过 Apples网站上的文档和Im使用参考手册。

Im wading through the documentation on Apples site, and Im using the reference manual as well.

但我真的可以从一个简单的指南中获益，它可以告诉我如何设置一个UICollectionView，而不必使用Storyboards或XIB / NIB文件 - 但不幸的是当我搜索

But I would really benefit from a simple guide that can show me how to set up a UICollectionView without having to use Storyboards or XIB/NIB files - but unfortunately when I search about, all I can find is tutorials that feature the Storyboard.

推荐答案

头文件： -

@interface ViewController : UIViewController<UICollectionViewDataSource,UICollectionViewDelegateFlowLayout>
{
    UICollectionView *_collectionView;
}

实施文件：

- (void)viewDidLoad
{
     [super 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];


    // Do any additional setup after loading the view, typically from a nib.
}

- (NSInteger)collectionView:(UICollectionView *)collectionView numberOfItemsInSection:(NSInteger)section
{
    return 15;
}

// 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(50, 50);
}

输出---

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