Question

我有两个UICollectionView's，并且正在将唯一类型的数据（猫，狗）传递到同一UIViewController。两种类型都有独特的属性，例如imageUrl，性别，年龄等。将这些数据填充到“文本视图”中的最佳方法是什么？

fileprivate var isDog = false

var detailsData: Any? {
    didSet {
        if detailsData is Dog {
            isDog = true
        } else if detailsData is Cat {
            isDog = false
        }
    }
}

override func viewDidLoad() {
    super.viewDidLoad()

    isDog ? fillDogInfo(detailsData: detailsData as! Dog) : fillCatInfo(detailsData: detailsData as! Cat)
}

fileprivate func fillDogInfo(detailsData: Dog) {
    contactButtonOutlet.isHidden = false

    // Short Info
    if let name = detailsData.name {
        shortInfoMutableAttributedString.append("\(name)\n".customAttributedString(font: Font.header, textColor: UIColor.darkGray))
    }

    if let age = detailsData.age {
        shortInfoMutableAttributedString.append("\(age)\n".customAttributedString(font: Font.header, textColor: UIColor.darkGray))
    }

    shortInfoTextView.attributedText = shortInfoMutableAttributedString
}

fileprivate func fillCatInfo(detailsData: Car) {
    contactButtonOutlet.isHidden = true

    if let name = detailsData.name {
        shortInfoMutableAttributedString.append("\(name)\n".customAttributedString(font: Font.header, textColor: UIColor.darkGray))
    }

    if let gender = detailsData.gender {
        shortInfoMutableAttributedString.append("\(gender)\n".customAttributedString(font: Font.header, textColor: UIColor.darkGray))
    }

    shortInfoTextView.attributedText = shortInfoMutableAttributedString
}

还有其他方法可以用更少的代码填充此数据吗？

Answer 1

经典的多态性案例，您应该创建一个协议并让Dog和Cat类实现它。然后，您可以仅在此协议实例上调用函数。

下面是一个简化的示例。在此示例中，进行区分是没有意义的，因为就属性而言，Cat和Dog都是同一类。如果您想区别一下，这将变得很有趣，例如，仅将bark()类添加一个Dog函数

protocol Pet{
    var name: String { get set}
    func infoString() -> String
}

class Dog: Pet{
    var name: String
    var age: Int

    init(name: String, age: Int) {
        self.name = name
        self.age = age
    }

    func infoString() -> String {
        return "Dog \(name) has age \(age)"
    }
}

class Cat: Pet{
    var name: String
    var gender: String

    init(name: String, gender: String) {
        self.name = name
        self.gender = gender
    }

    func infoString() -> String {
        return "Cat \(name) has gender \(gender)"
    }
}


fileprivate func fillPetInfo(pet: Pet){
   textView.text = pet.infoString()
}

let dog = Dog(name: "Ruffer", age: 8)
fillPetInfo(pet: dog)

填充不同类型数据的最佳，最有效方法

1 个答案: