Swift中函数声明和定义的分离

本文是小编为大家收集整理的关于Swift中函数声明和定义的分离的处理/解决方法，可以参考本文帮助大家快速定位并解决问题，中文翻译不准确的可切换到English标签页查看源文。

中文
English

问题描述

我正在看新的Swift.我来自C，C ++，Objective-C ...我注意到在Swift中不可能(?)分开声明和函数的定义.结果是结构和班级声明非常长且肿，因此很难通过查看代码来对课程进行"快速图片".难道我做错了什么?除了试图使功能较小之外，还有什么方法可以克服这个问题吗?预先感谢

其他推荐答案

只是一种疯狂的公共API和私人实施的方式:

疯狂 - 代表工厂方法create()，我不喜欢在不真正需要的情况下在Swift中看到.

在 Aclass.Swift 文件:

// Public API
class AClass {

    private init() {

    }

    class func create() -> AClass {
        return AClassPrivateImplementation()
    }

    // Only method declaration
    func sayHello() {}
}

// Private implementation
private class AClassPrivateImplementation: AClass {

    override func sayHello() {
        privateImplementation()
    }

    func privateImplementation() {
        println("Hello")
    }
}

用法:

let a = AClass.create()
a.sayHello()

为什么它可以工作: private修饰符使得仅在源文件中可见.

优点:您可以定义多个实现，因此需要其他createOther().

缺点:看起来像Java或C#，不是快速的方法:)

其他推荐答案

关于我们能做的最好的方法是将协议用作实施声明，并标记所有私人方法:

protocol TestInterface {
    var propertyPublic1: String { get }
    func funcPublic1() -> Int
}

class Test : TestInterface {
    var propertyPublic1: String = "text."
    func funcPublic1() -> Int {return 754}

    private var propertyPrivate1: Int = 5678
    private func funcPrivate1() -> Int {return 334}
}

var t = Test()
let propPublic1 = t.propertyPublic1

问题在于它没有作为标准成语提供，命名不幸，我刚刚将"接口"附加到了类名.

本文地址：https://www.itbaoku.cn/post/627315.html

百度翻译此文有道翻译此文

问题描述

I'm having a look at the new Swift. I come from C, C++, Objective-C... I notice that in swift is not possible (?) to separate the declaration and the definition of functions. The result of this is that structure and class declarations are very long and bloated, and it is therefore difficult to have a "quick picture" of the class by looking at the code. Am I doing something wrong? Is there any approach to overcome this problem, besides trying to make functions small, etc.? Thanks in advance

其他推荐答案

Just a crazy way to have public API and private implementation:

crazy - stands for factory method create() which I do not like to see in swift without real need.

In AClass.swift file:

// Public API
class AClass {

    private init() {

    }

    class func create() -> AClass {
        return AClassPrivateImplementation()
    }

    // Only method declaration
    func sayHello() {}
}

// Private implementation
private class AClassPrivateImplementation: AClass {

    override func sayHello() {
        privateImplementation()
    }

    func privateImplementation() {
        println("Hello")
    }
}

Usage:

let a = AClass.create()
a.sayHello()

Why it works: private modifier makes things visible only within source file.

Advantages: you can define more than one implementation hence additional createOther() will be needed.

Disadvantages: it looks like Java or C#, not a Swift way :)

其他推荐答案

About the best we can do is use protocols as Implementation declarations and mark all private methods:

protocol TestInterface {
    var propertyPublic1: String { get }
    func funcPublic1() -> Int
}

class Test : TestInterface {
    var propertyPublic1: String = "text."
    func funcPublic1() -> Int {return 754}

    private var propertyPrivate1: Int = 5678
    private func funcPrivate1() -> Int {return 334}
}

var t = Test()
let propPublic1 = t.propertyPublic1

The problem is that it is not provided as a standard idiom and the naming is unfortunate, I have just appended "Interface" to the class name.

上一篇：如何从设计的角度处理CouchDB修订?

下一篇：如何用html改变字体颜色？