Iphone 当键盘打开时，如何将我的视图向上拖动一点？

在我的应用程序中，我有一些通过键盘填充的文本字段。其中有6个，最后两个在屏幕的最底部，每当键盘出现时，它就会被隐藏起来。

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任何建议？？？

使用UIScrollview以便用户可以向下滚动。您可以使用UITextField的inputAccessoryView来显示“下一个”和“上一个”按钮，单击“让输入跳转到下一个文本字段并滚动到它”

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看看这个，同样的问题，不同的解决方案。

将textFields委托为self，并将以下代码添加到textfielddebeginediting和textfielddendediting

定义以下常量：（这些常量是为iPad设置的。为iphone调整它们）

在类的.h文件中添加两个变量。CGFloat距离；和UITextField*currentField

- (void)textFieldDidBeginEditing:(UITextField *)textField {

    currentField = textField;
    UIInterfaceOrientation orientation =
    [[UIApplication sharedApplication] statusBarOrientation];

    CGRect textFieldRect =[self.view.window convertRect:textField.bounds fromView:textField];

    CGRect viewRect =[self.view.window convertRect:self.view.bounds fromView:self.view];
    if (orientation == UIInterfaceOrientationLandscapeLeft )
    {
        textFieldRect.origin.y = textFieldRect.origin.x;
        textFieldRect.size.height = textFieldRect.size.width;
        viewRect.size.height = viewRect.size.width;
    }
    else  if (orientation == UIInterfaceOrientationLandscapeRight )
    {
        textFieldRect.origin.y =viewRect.size.width - textFieldRect.origin.x;
        textFieldRect.size.height = textFieldRect.size.width;
        viewRect.size.height = viewRect.size.width;
    }
    else   if (orientation == UIInterfaceOrientationPortraitUpsideDown)
    {
        textFieldRect.origin.y = viewRect.size.height - textFieldRect.origin.y;
    }

    CGFloat midline = textFieldRect.origin.y + 0.5 * textFieldRect.size.height;
    CGFloat numerator = midline - viewRect.origin.y - MINIMUM_SCROLL_FRACTION * viewRect.size.height;
    CGFloat denominator =(MAXIMUM_SCROLL_FRACTION - MINIMUM_SCROLL_FRACTION)* viewRect.size.height;
    CGFloat heightFraction = numerator / denominator;
    if (heightFraction < 0.0)
    {
        heightFraction = 0.0;
    }
    else if (heightFraction > 1.0)
    {
        heightFraction = 1.0;
    }
    if (orientation == UIInterfaceOrientationPortrait ||
        orientation == UIInterfaceOrientationPortraitUpsideDown)
    {
        animatedDistance = floor(PORTRAIT_KEYBOARD_HEIGHT * heightFraction);
    }
    else
    {
        animatedDistance = floor(LANDSCAPE_KEYBOARD_HEIGHT * heightFraction);
    }
    CGRect viewFrame = self.view.frame;
    viewFrame.origin.y -= animatedDistance;

    [UIView beginAnimations:nil context:NULL];
    [UIView setAnimationBeginsFromCurrentState:YES];
    [UIView setAnimationDuration:KEYBOARD_ANIMATION_DURATION];

    [self.view setFrame:viewFrame];

    [UIView commitAnimations];

}


- (void)textFieldDidEndEditing:(UITextField *)textField {

    [textField resignFirstResponder];

    CGRect viewFrame = self.view.frame;
    viewFrame.origin.y += animatedDistance;

    animatedDistance = 0;
    [UIView beginAnimations:nil context:NULL];
    [UIView setAnimationBeginsFromCurrentState:YES];
    [UIView setAnimationDuration:KEYBOARD_ANIMATION_DURATION];

    [self.view setFrame:viewFrame];

    [UIView commitAnimations];

    currentField = nil;
}

-（void）textFieldDidBeginEditing:（UITextField*）textField{
currentField=textField；
界面定向=
[[UIApplication sharedApplication]statusBarOrientation]；
CGRect textFieldRect=[self.view.window convertRect:textField.bounds fromView:textField]；
CGRect viewRect=[self.view.window convertRect:self.view.bounds fromView:self.view]；
if（方向==UIInterfaceOrientationAndscapeLeft）
{
textFieldRect.origin.y=textFieldRect.origin.x；
textFieldRect.size.height=textFieldRect.size.width；
viewRect.size.height=viewRect.size.width；
}
else if（方向==UIInterfaceOrientationAndscapeRight）
{
textFieldRect.origin.y=viewRect.size.width-textFieldRect.origin.x；
textFieldRect.size.height=textFieldRect.size.width；
viewRect.size.height=viewRect.size.width；
}
else if（方向==UIInterfaceOrientationGraphitalUpsideDown）
{
textFieldRect.origin.y=viewRect.size.height-textFieldRect.origin.y；
}
CGFloat midline=textFieldRect.origin.y+0.5*textFieldRect.size.height；
CGFloat分子=中线-viewRect.origin.y-最小滚动分数*viewRect.size.height；
CGFloat分母=（最大滚动分数-最小滚动分数）*viewRect.size.height；
CGFloat heightFraction=分子/分母；
如果（高度分数<0.0）
{
高度分数=0.0；
}
否则如果（高度分数>1.0）
{
高度分数=1.0；
}
如果（方向==UIInterfaceOrientationParative||
方向==UIInterfaceOrientationGraphitalUpsideDown）
{
动画距离=地板（纵向\键盘\高度*高度分数）；
}
其他的
{
动画距离=地板（横向键盘高度*高度分数）；
}
CGRect viewFrame=self.view.frame；
viewFrame.origin.y-=动画距离；
[UIView beginAnimations:nil上下文：NULL]；
[UIView setAnimationBeginsFromCurrentState:是]；
[UIView设置动画持续时间：键盘动画持续时间]；
[self.view setFrame:viewFrame]；
[UIView委员会]；
}
-（void）textfielddidediting:（UITextField*）textField{
[textField resignFirstResponder]；
CGRect viewFrame=self.view.frame；
viewFrame.origin.y+=动画距离；
动画距离=0；
[UIView beginAnimations:nil上下文：NULL]；
[UIView setAnimationBeginsFromCurrentState:是]；
[UIView设置动画持续时间：键盘动画持续时间]；
[self.view setFrame:viewFrame]；
[UIView委员会]；
currentField=零；
}

它给了我一个错误，当前字段未声明，动画距离未声明。这些是什么？哦，对不起。您必须声明CGFloat animatedDistance；和UITextField*currentField；在你们班的.h。我来编辑答案。谢谢你指出这一点。或者看看Matt的这篇很棒的教程：参见带有代码示例的分步博客教程。。

- (void)textFieldDidBeginEditing:(UITextField *)textField {

    currentField = textField;
    UIInterfaceOrientation orientation =
    [[UIApplication sharedApplication] statusBarOrientation];

    CGRect textFieldRect =[self.view.window convertRect:textField.bounds fromView:textField];

    CGRect viewRect =[self.view.window convertRect:self.view.bounds fromView:self.view];
    if (orientation == UIInterfaceOrientationLandscapeLeft )
    {
        textFieldRect.origin.y = textFieldRect.origin.x;
        textFieldRect.size.height = textFieldRect.size.width;
        viewRect.size.height = viewRect.size.width;
    }
    else  if (orientation == UIInterfaceOrientationLandscapeRight )
    {
        textFieldRect.origin.y =viewRect.size.width - textFieldRect.origin.x;
        textFieldRect.size.height = textFieldRect.size.width;
        viewRect.size.height = viewRect.size.width;
    }
    else   if (orientation == UIInterfaceOrientationPortraitUpsideDown)
    {
        textFieldRect.origin.y = viewRect.size.height - textFieldRect.origin.y;
    }

    CGFloat midline = textFieldRect.origin.y + 0.5 * textFieldRect.size.height;
    CGFloat numerator = midline - viewRect.origin.y - MINIMUM_SCROLL_FRACTION * viewRect.size.height;
    CGFloat denominator =(MAXIMUM_SCROLL_FRACTION - MINIMUM_SCROLL_FRACTION)* viewRect.size.height;
    CGFloat heightFraction = numerator / denominator;
    if (heightFraction < 0.0)
    {
        heightFraction = 0.0;
    }
    else if (heightFraction > 1.0)
    {
        heightFraction = 1.0;
    }
    if (orientation == UIInterfaceOrientationPortrait ||
        orientation == UIInterfaceOrientationPortraitUpsideDown)
    {
        animatedDistance = floor(PORTRAIT_KEYBOARD_HEIGHT * heightFraction);
    }
    else
    {
        animatedDistance = floor(LANDSCAPE_KEYBOARD_HEIGHT * heightFraction);
    }
    CGRect viewFrame = self.view.frame;
    viewFrame.origin.y -= animatedDistance;

    [UIView beginAnimations:nil context:NULL];
    [UIView setAnimationBeginsFromCurrentState:YES];
    [UIView setAnimationDuration:KEYBOARD_ANIMATION_DURATION];

    [self.view setFrame:viewFrame];

    [UIView commitAnimations];

}


- (void)textFieldDidEndEditing:(UITextField *)textField {

    [textField resignFirstResponder];

    CGRect viewFrame = self.view.frame;
    viewFrame.origin.y += animatedDistance;

    animatedDistance = 0;
    [UIView beginAnimations:nil context:NULL];
    [UIView setAnimationBeginsFromCurrentState:YES];
    [UIView setAnimationDuration:KEYBOARD_ANIMATION_DURATION];

    [self.view setFrame:viewFrame];

    [UIView commitAnimations];

    currentField = nil;
}