UITextField

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      // 文本输入框    UITextField *textField = [[UITextField alloc] initWithFrame:CGRectMake(10, 440, 300, 30)];    textField.tag = 101;    // 设置边框风格    textField.borderStyle = UITextBorderStyleLine;    // 设置键盘风格    textField.keyboardAppearance = UIKeyboardAppearanceDark;    // 设置键盘样式    textField.keyboardType = UIKeyboardTypeDefault;    // 设置密文输入 secureTextEntry 安全文本入口    textField.secureTextEntry = YES;    // 设置默认文字    textField.placeholder = @"Please input your password";    // 设置清除按钮    textField.clearButtonMode = UITextFieldViewModeAlways;    // 设置最小输入值    //    textField.minimumFontSize = 5.0;    textField.rightViewMode =  UITextFieldViewModeAlways;    textField.leftViewMode = UITextFieldViewModeAlways;    // 设置return样式    textField.returnKeyType = UIReturnKeyGoogle;    // 设置代理    textField.delegate = self; // 让self代替它做事    [self.view addSubview:textField];    UIButton *button = [UIButton buttonWithType:UIButtonTypeSystem];    button.frame = CGRectMake(10, 100, 150, 30);    [button setTitle:@"Close the keyboard" forState:UIControlStateNormal];    [button addTarget:self action:@selector(buttonAction) forControlEvents:UIControlEventTouchUpInside];    [self.view addSubview:button];    button.backgroundColor = [UIColor lightGrayColor];        // 订阅键盘升起和落下的系统通知//    UIKeyboardWillShowNotification    [[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(keyboardWillShow) name:UIKeyboardWillShowNotification object:nil];//    UIKeyboardWillHideNotification    [[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(keyboardWillHide) name:UIKeyboardWillHideNotification object:nil];    // self为通知接收者，收到通知后，执行操作    // 键盘升起和落下的系统通知//    1. UIKeyboardWillShowNOtification//    2. UIKeyboardWillHideNotification        // 自定义弹出视图    UIView *view = [[UIView alloc] initWithFrame:CGRectMake(0, 0, 320, 230)];    view.backgroundColor = [UIColor lightGrayColor];//    textField.inputView = view;    }#pragma  mark - NSNotification Action// 当接收到通知，改变textField的frame，从而实现动态变化- (void)keyboardWillShow {    UITextField *textField = (UITextField *)[self.view viewWithTag:101];    textField.frame = CGRectMake(10, 220, 300, 30);}- (void)keyboardWillHide {    UITextField *textField = (UITextField *)[self.view viewWithTag:101];    textField.frame = CGRectMake(10, 440, 300, 30);}#pragma mark - button Action- (void)buttonAction {        UITextField *textField = (UITextField *)[self.view viewWithTag:101];    [textField resignFirstResponder];}#pragma mark - UITextField Delegate// 是否可以进入编辑模式- (BOOL)textFieldShouldBeginEditing:(UITextField *)textField {    return  YES;}// 是否结束编辑模式- (BOOL)textFieldShouldEndEditing:(UITextField *)textField  {    return YES;}// 是否可以清除(清除按钮是否有效)      defalut is YES- (BOOL)textFieldShouldClear:(UITextField *)textField {    //    [textField resignFirstResponder];    return YES;}// 输入之后是否可以改变               default is YES- (BOOL)textField:(UITextField *)textField shouldChangeCharactersInRange:(NSRange)range replacementString:(NSString *)string {    return YES;}// return是否可用- (BOOL)textFieldShouldReturn:(UITextField *)textField {    // 收起键盘,响应者，一个屏幕上会有第一响应者  firstResponder    // 取消第一响应者 收起键盘 关闭光标        [textField resignFirstResponder];        /**     *  1.点击return     2.点击空白地方     3.点击按钮     4.滑动     */    return YES;}// 手指点击屏幕的函数- (void)touchesBegan:(NSSet *)touches withEvent:(UIEvent *)event {        UITextField *textField = (UITextField *)[self.view viewWithTag:101];    [textField resignFirstResponder];    // 事件路由  事件分发    }
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