Swift 4 iOS - 來自UITextField的字數

Question

嘗試使用Swift 4 iOS - UITextField製作「字數統計」功能。以下代碼無法打印在我的UITextField中鍵入的字符串的.count。

import UIKit 

class ViewController: UIViewController { 

    override func viewDidLoad() { 
    super.viewDidLoad() 

     //INPUT BOX - for Word Count! 
     let INPUT : UITextField = UITextField(frame: CGRect(x: 35, y: 200, width: 350, height:50)) 
      INPUT.placeholder = "Type Words separated with Spaces!" 
      INPUT.font = UIFont.init(name:"times", size: 22) 
      INPUT.backgroundColor = UIColor(red:0x00 ,green:0xff, blue:0x00 ,alpha:1) 
      self.view.addSubview(INPUT) 

     //variable holding the value of text typed 
     let strings : String! = INPUT.text 

     //variable holding the methods for detecting spaces and new lines 
     let spaces = CharacterSet.whitespacesAndNewlines.union(.punctuationCharacters) 

     //variable storing the amount of words minus the spaces 
     let words = strings.components(separatedBy: spaces) 

     //method to display the word count in the console 
     print(words.count) 
    } 
} 

這個錯誤被印在控制檯： 「結果」 =>：0

Answer 1

那是因爲你的TextView有在這一點上它沒有文字。

試試這個：

INPUT.text = "Some Text" 

執行從實際輸入獲取文本：

INPUT.addTarget(self, action: #selector(textFieldDidChange(_:)), for: .editingChanged) 

func textFieldDidChange(_ textField: UITextField) { 

    let strings : String! = INPUT.text 
    let spaces = CharacterSet.whitespacesAndNewlines.union(.punctuationCharacters) 
    let words = strings.components(separatedBy: spaces) 
    print(words.count) 

}