swift: 如何将一个字符串从textField 分配给另一个字符串？

Question

swift: 如何将一个字符串从 textField 分配给另一个字符串？

例如：

如果用户在 texField 中写入 "abc" 我希望 program/app 输出 "DoReMi"

a=Do  
b=Re  
c=Mi

谢谢

Answer 1

这样试试：

let inputString = "abc"
// create a dictionary with your notes
let notes = ["a":"Do","b":"Re","c":"Mi","d":"Fa","e":"So","f":"La","g":"Ti"]
// map the value of your string characters keys
let output = "".join( Array(inputString).map{ notes[ String([=10=]) ] ?? "" } )
println(output)   // "DoReMi"

如果您希望它在用户输入时发生，您只需将 addTarget 添加到您的 textField 中，控件事件编辑更改如下：

import UIKit

class ViewController: UIViewController {

    @IBOutlet weak var textField: UITextField!
    @IBOutlet weak var label: UILabel!

    let notes = ["a":"Do","b":"Re","c":"Mi","d":"Fa","e":"So","f":"La","g":"Ti"]

    override func viewDidLoad() {
        super.viewDidLoad()
        textField.addTarget(self, action: "editingChanged:", forControlEvents: UIControlEvents.EditingChanged)
        textField.becomeFirstResponder()
    }

    override func didReceiveMemoryWarning() {
        super.didReceiveMemoryWarning()
        // Dispose of any resources that can be recreated.
    }

    func editingChanged(sender: UITextField) {
        sender.text = sender.text!.notesOnly
         label.text = String(Array(textField.text!.characters).map{ self.notes[ String([=11=]) ] ?? "" })
    }

}

extension String {
    var notesOnly: String {
        return componentsSeparatedByCharactersInSet(NSCharacterSet(charactersInString: "abcdefg").invertedSet).joinWithSeparator("")
    }
}

Answer 2

希望我能理解您的问题：您希望能够接收一个字符串，然后根据用户输入的内容输出一个字符串，这样正确吗？您可以使用字典来完成此操作。在视图控制器文件的顶部添加一个变量，如下所示：

var myDic = ["a":"Do", "b":"Re", "c":"Mi"]

然后您所要做的就是检查文本字段字符串中的每个字符，它可能看起来像这样：

let stringArr = Array(textField.text)
var outStr = ""
for char in stringArr {
    if let c = myDic[String(char)] {
        outStr = outStr + c
    }
}
println(outStr)

swift: 如何将一个字符串从textField 分配给另一个字符串？

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