c# - 使用两个相似的 Collection View 单元格，从而避免代码重复

Question

我想要两个几乎相似的单元格。区别仅在于多显示一个 View 。

因此我想使用自定义构造函数。通常你有一个类似于这个的构造函数:

public class AnimalCell : UICollectionViewCell
{
    [Export ("initWithFrame:")]
    public AnimalCell (CGRect frame) : base (frame)
    {
        // do something
    }
}

我想传递一个类型，根据这个类型，我想在单元格上显示不同的项目。最好的方法是使用这样的构造函数:

public AnimalCell(MyCustomType type)
{
    if(type == XXX){
        // add as subview, add constraints, ...
    }else{
        // normal setup
    }
}

当然，我想保持单元重用。这可以实现吗？怎么办？

我想到的另一件事是使用子类化。有没有人知道如何定义 cell 以便我不必重复相同的代码？例如

var cell = null;
if (MyCustomType == XXX) {
    cell = collectionView.DequeueReusableCell (DefaultCell.Key, indexPath) as DefaultCell;
} else {
    cell = collectionView.DequeueReusableCell (CustomizedCell.Key, indexPath) as CustomizedCell;
}
cell.DoSomething("someValue"); // this doesn't work because you have to define cell with a certain class
// do some more initialization

我目前的解决方案:

public abstract class DefaultCell : UICollectionViewCell
{
    protected bool someVariable;

    [Export ("initWithFrame:")]
    public DefaultCell (CGRect frame) : base (frame)
    {
    }

    public void DoSomething(string text)
    {
        label.Text = text;
    }
}

public class Custom1Cell : DefaultCell
{
    public static readonly NSString Key = new NSString ("Custom1Cell");

    [Export ("initWithFrame:")]
    public Custom1Cell (CGRect frame) : base (frame)
    {
        initialize ();
    }

    private void initialize()
    {
        // some initialization
    }
}

public class Custom2Cell : DefaultCell
{
    public static readonly NSString Key = new NSString ("Custom2Cell");

    [Export ("initWithFrame:")]
    public Custom2Cell (CGRect frame) : base (frame)
    {
        initialize ();
    }

    private void initialize()
    {
        // some initialization
    }

    public void SomeMethod(string text)
    {
        if(someVariable)
            someOtherLabel.Text = text;
    }
}

如 Mahmoud 所描述的出列工作:

DefaultCell cell;
if (type = XXX) {
    cell = collectionView.DequeueReusableCell (Custom1Cell.Key, indexPath) as Custom1Cell;
} else {
    cell = collectionView.DequeueReusableCell (Custom2Cell.Key, indexPath) as Custom2Cell;
}
cell.DoSomething("works on both cell types");
((Custom2Cell)cell).SomeMethod("works only on one cell type");

Answer 1

也许你考虑一个具有共享变量和方法的抽象类(将其命名为 BaseClass)和另外两个继承自抽象类的类，在代码中你可以将 cell 定义为一个对象并在 if 语句中初始化它，如下所示:

Object cell;
if (MyCustomType == XXX) {
    cell = new class1()
   ((Class1) cell).MethodInClass1();
} else{
   cell = new class2();
   ((Class2) cell).MethodInClass2();
}