如何快速显示数组中对象的值，而不是其位置 [英] how to print value of object in an array in swift, not its location

问题描述

我有一个类，该类在同一项目内的单独的swift文件中包含某些企业家的数据.

I have a class that contains data on certain entrepreneurs in a separate swift file that is within the same project.

它看起来像这样:

class Entrepreneur:NSObject {

var name:String?
var netWorth = (0.0, "")
var company:String?
var summary: [String]
var age: Int?
override init() {
    name = ""
    company = ""
    summary = [""]
    age = 1;

}

在同一文件中，我有一个函数返回一个 NSMutableArray ，其中包含企业家类的实例，如下所示:

In the same file I have a function that returns an NSMutableArray which contain the instances of the entrepreneur class like this:

func populateArray() -> NSMutableArray {

var entreprenuersArray: NSMutableArray = []

//Mark Zuckerberg
let markZuckerBerg = Entrepreneur()
markZuckerBerg.name = "Mark Zuckerberg"
markZuckerBerg.age = 19
markZuckerBerg.company = "Facebook"
markZuckerBerg.netWorth = (35.7, "Billion")

// add mark zuckerberg object to array
entreprenuersArray.addObject(markZuckerBerg)
print (entreprenuersArray)

在我的 ViewController.swift 文件中，创建一个称为企业家的常量，并为其提供上面创建的企业家"类的类型，并按如下所示对其进行初始化:

in my ViewController.swift file I create a constant called entrepreneurss and give it a type of the class "Entrepreneur" created above and initialize it like so:

let entrepreneuerss:Entrepreneur = Entrepreneur()

然后我访问一种类方法，即"populateArray"函数，并尝试打印企业家数组，如下所示:

I then access one the class methods, the "populateArray" function and try to print the entrepreneurss array like so:

   entrepreneuerss.populateArray()
    print (entrepreneuerss)

问题是打印功能正在打印对象的位置而不是值...类似这样的东西:.Entrepreneur:0x7f88d0e3ecc0>"

The issue is the print function is printing the location of the object and not the value...something like this: .Entrepreneur: 0x7f88d0e3ecc0>"

我需要做什么，以便我可以返回对象值而不是位置的数组.我希望能够从ViewController.swift文件访问对象数组，并随机选择一个对象并访问其属性.

What do I need to do so that I can return an array of the object values and not the location. I want to be able to access the array of object from my ViewController.swift file and randomly select an object and access its properties.

推荐答案

首先，您有一个实例方法，该方法返回Entrepreneur对象的数组(顺便说一句，我看不到return，也许您忘记复制了).

First, you have a instance method which returns an array of Entrepreneur objects (by the way, I don't see a return, maybe you forgot to copy it).

该方法应该是一个类方法，因为您不使用Entrepreneur对象的任何属性来返回它:

This method should be a class method, because you don't use any property of the Entrepreneur object which returns it :

class func populateArray() -> [Entrepreneur] {

    var entreprenuersArray:[Entrepreneur] = []

    //Mark Zuckerberg
    let markZuckerBerg = Entrepreneur()
    markZuckerBerg.name = "Mark Zuckerberg"
    markZuckerBerg.age = 19
    markZuckerBerg.company = "Facebook"
    markZuckerBerg.netWorth = (35.7, "Billion")

    // add mark zuckerberg object to array
    entreprenuersArray.append(markZuckerBerg)
    print (entreprenuersArray)

    return entreprenuersArray
}

然后您可以通过调用来获取数组:

Then you can have your array by calling :

let array = Entrepreneur.populateArray()

---

第二，在此方法中，创建一个Entrepreneur对象的数组并返回它，但是在示例代码中，您从不使用该数组:

---

Secondly, in this method, you create an array of Entrepreneur object and returns it, but in your example code, you never use this array :

// Creates a Entrepreneur object with default values
let entrepreneuerss:Entrepreneur = Entrepreneur()

// create an array of entrepreneurs objects, returns it, but never use it
entrepreneuerss.populateArray()

// print some information about the object with default values
print (entrepreneurs)

相反，您应该使用class方法并尝试:

Instead, you should use the class method and try:

// create an array of entrepreneurs objects, returns it, 
let arrayEntrepreneurs = Entrepreneur.populateArray()

// print some information about the array of Entrepreneurs objects
print (arrayEntrepreneurs)

---

为了对对象有详细的描述，因为它是从NSObject继承的，所以只需覆盖description只读属性，即可在登录对象时自定义文本:

---

In order to have a detailed description of your object, since it inherits from NSObject, just override the description read-only property in order to customize the text when you log your object :

override var description : String {
    get {
        return "Entrepreneur : name : `\(name) - company : `\(company)` - summary : `\(summary)` - age : `\(age)`"
    }
}

因此您的打印功能将返回:

Thus your print function will return :

[Entrepreneur : name : `Optional("Mark Zuckerberg") - company : `Optional("Facebook")` - summary : `[""]` - age : `Optional(19)`]

这篇关于如何快速显示数组中对象的值，而不是其位置的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！