以编程方式创建 uicollectionview 时使用自定义 init 方法 [英] Use custom init method when programmatically creating a uicollectionview

问题描述

由于 Storyboard 的限制，我正在以编程方式创建 UICollectionView.这一切正常，当我想添加 UICollectionViewCell 时，我执行以下操作:

Due to the limitations of Storyboard I am creating a UICollectionView programmatically. This is working all fine and when I want to add a UICollectionViewCell I do the following:

[collectionView registerClass:[Cell class] forCellWithReuseIdentifier:@"ID"];

我想知道的是如何使用Cell"类中的自定义 init 方法，因为我无法执行以下操作:

What I was wondering is how can I use a custom init method from the class "Cell", because I can't do something like the following:

[collectionView registerClass:[[Cell class]init_custom]forCellWithReuseIdentifier:@"ID"];

问题:如何使用自定义 UICollectionViewCell 类中的自定义 init 方法?

Question: How can I use a custom init method from a custom UICollectionViewCell class?

推荐答案

如果我理解正确，那么我将创建您的集合视图单元格的子类.

If I understand you correctly, then I would create subclasses of your collection view cell.

首先用你想要的一切设置你的单元.

First setup your cell with everything you want.

@interface MyCollectionViewCell : UICollectionViewCell
// Your custom cell
@end

@implementation MyCollectionViewCell
// Your custom cell
@end

然后为每个集合视图创建一个只覆盖 init 的子类.

Then for each collection view create a subclass which only overrides init.

@interface MyCollectionViewCellForCollectionView1 : MyCollectionViewCell

@end

@implementation MyCollectionViewCellForCollectionView1
- (instancetype)init // Only override -init
{
    self = [super init];
    if (self) {
        // Setup for collection view one
    }
    return self;
}
@end

@interface MyCollectionViewCellForCollectionView2 : MyCollectionViewCell

@end

@implementation MyCollectionViewCellForCollectionView2
- (instancetype)init // Only override -init
{
    self = [super init];
    if (self) {
        // Setup for collection view two
    }
    return self;
}
@end

然后为每个不同的集合视图注册一个子类.

Then for each different collection view, you register one of your subclasses.

[collectionView1 registerClass:[MyCollectionViewCellForCollectionView1 class] forCellWithReuseIdentifier:@"ID"];
[collectionView2 registerClass:[MyCollectionViewCellForCollectionView2 class] forCellWithReuseIdentifier:@"ID"];

这将为您提供您希望的单独的自定义 init 方法，但请确保将所有功能保留在基类中.

This will get you the separate custom init methods you wish, but be sure to keep all your functionality in the base class.

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