Adapter Design Patterns（适配器模式）

一个列表视图，加载不同的数据，为了使模型和视图分开可以使用适配器模式。图书，音乐，电影三个列表使用同一个列表进行展示，三者有各自不同的数据格式。
代码如下：

class BookModel: NSObject {
    
    var name: String!
    var author: String!
    var cover: String!
    
    init(name: String, author: String, cover: String) {
        super.init()
        self.name = name
        self.author = author
        self.cover = cover
    }
}

class MusicModel: NSObject {
    var name: String!
    var singer: String!
    var album: String!
    
    init(name: String, singer: String, album: String) {
        super.init()
        self.name = name
        self.singer = singer
        self.album = album
    }
}

class MovieModel: NSObject {
    
    var name: String!
    var director: String!
    var poster: String!
    
    init(name: String, director: String, poster: String) {
        super.init()
        self.name = name
        self.director = director
        self.poster = poster
    }

}

列表视图包含 一个imageView，两个label。
定义一个协议 CustomCellAdapterProtocol

protocol CustomCellAdapterProtocol {
    func title() -> String?
    func subTitle() -> String?
    func image() -> UIImage?
}

定义一个类实现该协议但不写具体方法，作为基类。

class CustomCellAdapter: NSObject, CustomCellAdapterProtocol {
    
    var data: Any!

    func title() -> String? {
        return nil
    }

    func subTitle() -> String? {
        return nil
    }
    
    func image() -> UIImage? {
        return nil
    }
}

然后编写模型适配器类

class ModelAdapter: CustomCellAdapter {

    init(data: Any) {
        super.init()
        self.data = data
    }
    
    override func title() -> String? {
        if ((data as? BookModel) != nil) {
            let model = data as! BookModel
            return model.name
        } else if ((data as? MusicModel) != nil){
            let model = data as! MusicModel
            return model.name
        } else {
            let model = data as! MovieModel
            return model.name
        }
       
        
    }
    
    override func subTitle() -> String? {
        if ((data as? BookModel) != nil) {
            let model = data as! BookModel
            return model.author
        } else if ((data as? MusicModel) != nil){
            let model = data as! MusicModel
            return model.singer
        } else {
            let model = data as! MovieModel
            return model.director
        }
        
    }
    
    override func image() -> UIImage? {
        if ((data as? BookModel) != nil) {
            let model = data as! BookModel
            return UIImage(named: model.cover)
        } else if ((data as? MusicModel) != nil){
            let model = data as! MusicModel
            return UIImage(named: model.album)
        } else {
            let model = data as! MovieModel
            return UIImage(named: model.poster)
        }
       
    }
}

列表视图加载数据

func loadData(data: CustomCellAdapterProtocol) {
        self.headImageView.image = data.image()
        self.headLabel.text = data.title()
        self.subHeadLabel.text = data.subTitle()
    }

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