textField1 = UITextField()
        //在编辑框左侧设置图片
        textField1.leftView = UIImageView(image: UIImage(named: "lock.png"))
        textField1.leftViewMode = .Always
        textField1.backgroundColor = UIColor.whiteColor()
        //在编辑框上设置提示
        textField1.placeholder = "原密码"
        textField1.layer.cornerRadius = 10
        textField1.layer.borderColor = UIColor(red: 0.180392, green: 0.603922, blue: 0.909804, alpha: 1).CGColor
        textField1.layer.borderWidth = 1
        textField1.delegate = self
        //当点击编辑框时清空里面的内容
        textField1.clearsOnBeginEditing = true
        //编辑框末端添加删除按钮
        textField1.clearButtonMode = .WhileEditing
        //设置为密码模式
        textField3.secureTextEntry = true
        self.view.addSubview(textField1)

实时打印编辑框里面输入的东西

func textField(textField: UITextField, shouldChangeCharactersInRange range: NSRange, replacementString string: String) -> Bool {
        //ts就是在编辑框里面输入的东西
        let os: NSString = textField.text!
        let ts = os.stringByReplacingCharactersInRange(range, withString: string)
}

[textField addTarget:self action:@selector(notification_a:) forControlEvents:UIControlEventEditingChanged];

- (void)notification_a:(UITextField*)textField{
    NSLog(@"%@",textField.text);
}