Swift 容易控件示例：文本框（UITextField）

//
//  ViewController.swift
//  UITextFieldSample
//
//  Created by jinnchang on 15/4/2.
//  Copyright (c) 2015年 Jinn Chang. All rights reserved.
//

import UIKit

class ViewController: UIViewController, UITextFieldDelegate {
    
    var textField: UITextField!

    override func viewDidLoad() {
        super.viewDidLoad()
        // Do any additional setup after loading the view, typically from a nib.
        
        textField = UITextField(frame: CGRectMake(30, 50, self.view.frame.size.width - 60, 40))
        textField.borderStyle = .RoundedRect
        textField.placeholder = "请输入内容"
        textField.text = "username"
        textField.delegate = self
        
        self.view.addSubview(textField)
    }

    override func didReceiveMemoryWarning() {
        super.didReceiveMemoryWarning()
        // Dispose of any resources that can be recreated.
    }
    
    // 进入编辑状态
    func textFieldDidBeginEditing(textField: UITextField) {
        println("开始编辑:\(textField.text)")
    }
    
    // 结束编辑状态
    func textFieldDidEndEditing(textField: UITextField) {
        println("结束编辑:\(textField.text)")
    }
    
    // Return 按钮隐藏键盘
    func textFieldShouldReturn(textField: UITextField) -> Bool {
        textField.resignFirstResponder()
        return true
    }
    
    // 点击编辑框外，隐藏键盘
    override func touchesEnded(touches: NSSet, withEvent event: UIEvent) {
        textField.resignFirstResponder()
    }

}