这是一个不完整的解决方案，但它应该为您提供一个很好的起点。
将以下 ivars 添加到您的 UIViewController：
CGRect keyboardSuperFrame; // frame of keyboard when initially displayed
UIView * keyboardSuperView; // reference to keyboard view
将 inputAccessoryView 添加到您的文本控制器。我创建了一个小视图作为附件视图插入：
accView = [[UIView alloc] initWithFrame:CGRectMake(0, 0, 0, 0)];
accView.backgroundColor = [UIColor clearColor];
textField.inputAccessoryView = accView;
我把上面的代码加到-(void)loadView
在视图加载时注册接收 UIKeyboardDidShowNotification 和 UIKeyboardDidHideNotification：
- (void)viewDidLoad
{
[super viewDidLoad];
[[NSNotificationCenter defaultCenter] addObserver:self
selector:@selector(keyboardWillShow:)
name:UIKeyboardWillShowNotification
object:nil];
[[NSNotificationCenter defaultCenter] addObserver:self
selector:@selector(keyboardDidShow:)
name:UIKeyboardDidShowNotification
object:nil];
return;
}
添加方法以指定为通知的选择器：
// method is called whenever the keyboard is about to be displayed
- (void)keyboardWillShow:(NSNotification *)notification
{
// makes keyboard view visible incase it was hidden
keyboardSuperView.hidden = NO;
return;
}
// method is called whenever the keyboard is displayed
- (void) keyboardDidShow:(NSNotification *)note
{
// save reference to keyboard so we can easily determine
// if it is currently displayed
keyboardSuperView = textField.inputAccessoryView.superview;
// save current frame of keyboard so we can reference the original position later
keyboardSuperFrame = textField.inputAccessoryView.superview.frame;
return;
}
添加跟踪触摸和更新键盘视图的方法：
// stops tracking touches to divider
- (void) touchesEnded:(NSSet *)touches withEvent:(UIEvent *)event
{
CGRect newFrame;
CGRect bounds = [[UIScreen mainScreen] bounds];
newFrame = keyboardSuperFrame;
newFrame.origin.y = bounds.size.height;
if ((keyboardSuperView.superview))
if (keyboardSuperFrame.origin.y != keyboardSuperView.frame.origin.y)
[UIView animateWithDuration:0.2
animations:^{keyboardSuperView.frame = newFrame;}
completion:^(BOOL finished){
keyboardSuperView.hidden = YES;
keyboardSuperView.frame = keyboardSuperFrame;
[textField resignFirstResponder]; }];
return;
}
// updates divider view position based upon movement of touches
- (void) touchesMoved:(NSSet *)touches withEvent:(UIEvent *)event
{
UITouch * touch;
CGPoint point;
CGFloat updateY;
if ((touch = [touches anyObject]))
{
point = [touch locationInView:self.view];
if ((keyboardSuperView.superview))
{
updateY = keyboardSuperView.frame.origin.y;
if (point.y < keyboardSuperFrame.origin.y)
return;
if ((point.y > updateY) || (point.y < updateY))
updateY = point.y;
if (keyboardSuperView.frame.origin.y != updateY)
keyboardSuperView.frame = CGRectMake(keyboardSuperFrame.origin.x,
point.y,
keyboardSuperFrame.size.width,
keyboardSuperFrame.size.height);
};
};
return;
}
免责声明：
- 当按照第一个响应退出时，键盘会在滑出屏幕之前移回其原始位置。为了使关闭键盘更加流畅，您首先需要创建一个动画来将键盘移出屏幕，然后隐藏视图。我将把这部分作为练习留给读者。
- 我只在 iOS 5 模拟器和装有 iOS 5 的 iPhone 上测试过这个。我没有在早期版本的 iOS 上测试过。
我为测试这个概念而创建的 SlidingKeyboard 项目可从 GitHub 的 BindleKit 示例目录中获得：
https://github.com/bindle/BindleKit
编辑：更新示例以解决第一个免责声明。