ios - 读取文本文件 - 使用 Swift

Question

当我编译并运行时，我在“if”语句中遇到 fatal error 。我错过了一行吗？或者其他的东西。我之前让它工作但不确定如何。

@IBOutlet weak var TextView: UITextView!
var TextFromFile = String()

override func viewDidLoad()
{
    super.viewDidLoad()
    TextView.text = TextFromFile
    let path = NSBundle.mainBundle().pathForResource("TextFile", ofType: "txt")

    if let content = String(contentsOfFile:path!, encoding: NSUTF8StringEncoding, error: nil) {

        let lines : [String] = content.componentsSeparatedByString("/n")

        TextView.text = content
    }

Answer 1

因为您进行了强制解包...这意味着路径可能为 nil 而您正尝试使用 nil 值...相反您应该使用 let binding like..

  if let path = NSBundle.mainBundle().pathForResource("TextFile", ofType: "txt"){

        if let content = String(contentsOfFile:path, encoding: NSUTF8StringEncoding, error: nil) {

            let lines : [String] = content.componentsSeparatedByString("\n")

            TextView.text = content
        }
    } 

And please make sure that you have moved your text file TextFile.txt to your Xcode-project (Use drag'n'drop and check "Copy files if necessary")

检查你的 Project Targets-> Build Phases -> copy build resources ....确保你的文件在构建资源中