在"Swift 3"中将文本从文本文件传递到UITextView

Question

我是iOS开发的初学者,我正在尝试创建一个简单的应用程序,它将文本从文本文件传递到"Swift 3"中的UITextView.我在YouTube,堆栈和其他网站上查找过很多教程,但是所有这些教程似乎都给了我很多错误,或者对我来说太难理解了(因为我太没经验了).

有三个按钮,三个文本文件和一个文本视图.当用户单击第一个按钮时,file1将被加载到文本字段中.

我的一些尝试,它在txt_view.text = txt1.txt上给我错误

import UIKit

class ViewController: UIViewController {

    @IBOutlet weak var txt_view: UITextView!

    @IBAction func btn_txt1(_ sender: Any) {

        txt_view.text = txt1.txt
    }

    @IBAction func btn_txt2(_ sender: Any) {

        txt_view.text = txt2.txt
    }

    @IBAction func btn_txt3(_ sender: Any) {

        txt_view.text = txt3.txt
    }

    override func viewDidLoad(){
        super.viewDidLoad()
    }

    override func didReceiveMemoryWarning(){
        super.didReceiveMemoryWarning()
    }
}

Answer 1

这可能是最简单的方法.

import UIKit

class ViewController: UIViewController {


    @IBOutlet weak var textView: UITextView!

    @IBAction func readFile1(_ sender: Any) {

        self.textView.text = load(file: "file1")
    }

    @IBAction func readFile2(_ sender: Any) {

        self.textView.text = load(file: "file2")
    }

    @IBAction func readFile3(_ sender: Any) {

        self.textView.text = load(file: "file3")
    }

    override func viewDidLoad() {
        super.viewDidLoad()
        // Do any additional setup after loading the view, typically from a nib.

        self.textView.text = load(file: "file1")
    }

    func load(file name:String) -> String {

        if let path = Bundle.main.path(forResource: name, ofType: "txt") {

            if let contents = try? String(contentsOfFile: path) {

                return contents

            } else {

                print("Error! - This file doesn't contain any text.")
            }

        } else {

            print("Error! - This file doesn't exist.")
        }

        return ""
    }
}