Swift 4 iOS - 来自UITextField的字数

Question

尝试使用Swift 4 iOS - UITextField制作“字数统计”功能。以下代码无法打印在我的UITextField中键入的字符串的.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) 
    } 
} 

这个错误被印在控制台： “结果” =>：0

Answer 1

那是因为你的TextView有在这一点上它没有文字。

试试这个：

INPUT.text = "Some Text" 

执行从实际输入获取文本：

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) 

}