Swift基础之UITextField

//设置全局变量,将下面的替换即可

    //var myTextField = UITextField();

    //系统生成的viewDidLoad()方法

    override func viewDidLoad() {

        super.viewDidLoad()

        // Do any additional setup after loading the view, typically from a nib.

        

        //创建局部变量UITextField

        let myTextField = UITextField.init(frame: CGRectMake(20, 100, self.view.frame.width-40, 60));

        //设置文本

        //myTextField.text = "这是一个输入框";

        //设置占位符

        myTextField.placeholder = "请输入你的内容......";

        //设置字体大小

        myTextField.font = UIFont.systemFontOfSize(22);

        //设置编辑框右侧出现的删除图标

        myTextField.clearButtonMode = UITextFieldViewMode.WhileEditing;

        //设置边框大小，默认为0

        myTextField.layer.borderWidth = 2;

        //设置边框颜色，默认为黑色

        myTextField.layer.borderColor = UIColor.redColor().CGColor;

        //设置圆角

        myTextField.layer.cornerRadius = 8;

        //设置背景颜色

        myTextField.backgroundColor = UIColor.cyanColor();

        //设置是否安全显示

        //myTextField.secureTextEntry = true;

        //设置键盘样式

        //myTextField.keyboardType = UIKeyboardType.NumberPad;//纯数字类型

        

        //设置return键类型

        /*typedef enum {

         UIReturnKeyDefault, 默认 灰色按钮，标有Return

         UIReturnKeyGo,    　标有Go的蓝色按钮

         UIReturnKeyGoogle,标有Google的蓝色按钮，用语搜索

         UIReturnKeyJoin,标有Join的蓝色按钮

         UIReturnKeyNext,标有Next的蓝色按钮

         UIReturnKeyRoute,标有Route的蓝色按钮

         UIReturnKeySearch,标有Search的蓝色按钮

         UIReturnKeySend,标有Send的蓝色按钮

         UIReturnKeyYahoo,标有Yahoo的蓝色按钮

         UIReturnKeyYahoo,标有Yahoo的蓝色按钮

         UIReturnKeyEmergencyCall, 紧急呼叫按钮

         } UIReturnKeyType;*/

        myTextField.returnKeyType = UIReturnKeyType.Search;

        

        //添加左视图或右视图

        let leftImgView = UIImageView.init(frame: CGRectMake(0, 0, 60, 60));

        leftImgView.image = UIImage(named: "login_pwd.png");

        myTextField.leftView = leftImgView;

        //设置视图显示的方式,添加视图后必须写

        myTextField.leftViewMode = UITextFieldViewMode.Always;

        

        //设置代理

        myTextField.delegate = self;

        

        //添加视图

        self.view.addSubview(myTextField);

    }

    

    //UITextFieldDelegate

    func textFieldDidBeginEditing(textField: UITextField) {

        print("执行了开始编辑方法。。。。");

    }

    func textField(textField: UITextField, shouldChangeCharactersInRange range: NSRange, replacementString string: String) -> Bool {

        print("执行了编辑框内容被某个值替换了的方法",string);

        return true;

    }