UITextField用法

UITextField *tf = [[UITextField alloc] initWithFrame:CGRectMake(60, 180, 200, 35)];

    tf.tag = 101;

    tf.delegate = self; // 设置代理

    tf.textColor = [UIColor redColor];

    //提示用户输入的内容文本

    tf.placeholder = @"用来提示用户";

    //自适应调整字体大小，默认为NO

    tf.adjustsFontSizeToFitWidth = YES;

    //用户编辑时是否Clean内容，默认是NO

    tf.clearsOnBeginEditing = YES;

    //清除按钮的模式，默认不出现

    tf.clearButtonMode = UITextFieldViewModeWhileEditing;

    //    tf.background = [UIImage imageNamed:@"navigation"];

    tf.borderStyle = UITextBorderStyleRoundedRect;//显示和android同样的框

     [tf becomeFirstResponder];//响应键盘事件

 // 自定义clear按钮

        UIView *view = [[UIView alloc] initWithFrame:CGRectMake(0, 0, 20, 20)];

        view.backgroundColor = [UIColor yellowColor];

        tf.rightView = view;

        [view release];

        tf.rightViewMode = UITextFieldViewModeUnlessEditing;

 // 自定义系统键盘

    UIView *csView = [[UIView alloc] initWithFrame:CGRectMake(0, 0, 320, 200)];

    csView.backgroundColor = [UIColor yellowColor];

    tf.inputView = csView;

    [csView release];

 //系统键盘和自定义键盘共存

       tf.inputAccessoryView = csView1;

      //是否安全输入，好比用户名，密码

      tf.secureTextEntry = YES;

     //修改键盘类型

      tf.keyboardType = UIKeyboardTypeNumberPad;

    //修改返回类型

      tf.returnKeyType = UIReturnKeyDone;

    //自动大写类型

      tf.autocapitalizationType = UITextAutocapitalizationTypeNone;

    UITextField *tf = (UITextField *)[self.window viewWithTag:101];

    // 将键盘移除

    [tf resignFirstResponder];

代理方法：

#pragma mark - TextField Delegate

//将要开始输入时调用，就是键盘要显示时调用

- (BOOL)textFieldShouldBeginEditing:(UITextField *)textField

{

    NSLog(@"textFieldShouldBeginEditing");

    return YES; // [textField becomeFirstResponder]; 

}

//键盘已经显示，作好编辑准备时调用

- (void)textFieldDidBeginEditing:(UITextField *)textField

{

    NSLog(@"textFieldDidBeginEditing");

}

//将要输入结束时调用，就是键盘将要离开时调用

- (BOOL)textFieldShouldEndEditing:(UITextField *)textField

{

    NSLog(@"textFieldShouldEndEditing");

    return YES; // [tf resignFirstResponder];

}

//键盘已经离开，结束编辑时调用，

- (void)textFieldDidEndEditing:(UITextField *)textField

{

    NSLog(@"textFieldDidEndEditing : %@", textField.text);

}

//文本改变监听

- (BOOL)textField:(UITextField *)textField shouldChangeCharactersInRange:(NSRange)range replacementString:(NSString *)string

{

    NSLog(@"shouldChangeCharactersInRange : %@", string);

    return YES;

}

//清除文字按钮点击事件

- (BOOL)textFieldShouldClear:(UITextField *)textField

{

    NSLog(@"textFieldShouldClear");

    return YES;

}

//键盘上的return按钮事件

- (BOOL)textFieldShouldReturn:(UITextField *)textField

{

    //隐藏输入键盘

    [textField resignFirstResponder];

    return YES;

}